publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2019-08-16 | Itinerant ferromagnetism and intrinsic anomalous Hall effect in amorphous iron-germanium | The amorphous iron-germanium system ($a$-Fe$_x$Ge$_{1-x}$) lacks long-range
structural order and hence lacks a meaningful Brillouin zone. The magnetization
of \aFeGe is well explained by the Stoner model for Fe concentrations $x$ above
the onset of magnetic order around $x=0.4$, indicating that the local order of
the a... | 1908.06055v3 |
2019-08-21 | Stellar population astrophysics (SPA) with the TNG. GIANO-B spectroscopy of red supergiants in Alicante 7 and Alicante 10 | The Scutum complex in the inner disk of the Galaxy hosts a number of young
clusters and associations of red supergiant stars that are heavily obscured by
dust extinction. These stars are important tracers of the recent star formation
and chemical enrichment history in the inner Galaxy. Within the SPA Large
Programme at... | 1908.07779v1 |
2019-08-28 | Neutrino halo effect on collective neutrino oscillation in iron core-collapse supernova model of a 9.6 $M_{\odot}$ star | We extend the multi-angle computational framework and investigate the time
evolution of the neutrino halo on collective neutrino oscillation in the core
collapse of an iron core progenitor. We find that in the case of the $9.6\, \rm
M_\odot$ progenitor adopted in this work, there are windows of time when the
effects of... | 1908.10594v2 |
2019-09-04 | Multi-epoch X-ray spectral analysis of the narrow-line Seyfert 1 galaxy Mrk 478 | A multi-epoch X-ray spectral and variability analysis is conducted for the
narrow-line Seyfert 1 (NLS1) active galactic nucleus (AGN) Mrk 478. All
available X-ray data from XMM-Newton and Suzaku satellites, spanning from 2001
to 2017, are modelled with a variety of physical models including partial
covering, soft-Compt... | 1909.01897v1 |
2019-09-16 | Ferrovolcanism on metal worlds and the origin of pallasites | As differentiated planetesimals cool, their cores can solidify from the
outside-in, as evidenced by paleomagnetic measurements and cooling rate
estimates of iron meteorites. The details of outside-in solidification and fate
of residual core melt are poorly understood. For a core primarily composed of
Fe and Ni alloyed ... | 1909.07451v1 |
2019-09-24 | Strongly correlated superconductor with polytypic 3D Dirac points | Topological superconductors should be able to provide essential ingredients
for quantum computing, but are very challenging to realize. Spin-orbit
interaction in iron-based superconductors opens the energy gap between the
$p$-states of pnictogen and $d$-states of iron very close to the Fermi level,
and such $p$-states ... | 1909.10806v2 |
2019-11-08 | Oxygen Reduction Reaction and X-ray Photoelectron Spectroscopy of Sputtered Fe-N-C Films | Electrocatalysts for the oxygen reduction reaction (ORR) based on complexes
of iron and nitrogen in a carbon matrix (Fe-N-C) are a promising alternative to
platinum group metal (PGM) based catalysts in polymer electrolyte membrane
(PEM) fuel cells. Further improvements of Fe-N-C catalysts would benefit from
model thin ... | 1911.03368v1 |
2019-11-14 | The Chemical Evolution of Iron-Peak Elements with Hypernovae | We calculate the mean evolution of the iron-peak abundance ratios
[(Cr,Mn,Co,Zn)/Fe] in the Galaxy, using modern supernova and hypernova chemical
yields and a Galactic Chemical Evolution code that assumes homogeneous chemical
evolution. We investigate a range of hypernova occurrence rates and are able to
produce a chem... | 1911.05901v2 |
2019-11-21 | Weakness of Correlation Effect Manifestation in BaNi$_2$As$_2$: ARPES and LDA+DMFT study | The electronic spectral function of BaNi$_2$As$_2$ is investigated using both
the angle-resolved photoemission spectroscopy (ARPES) and a combined
computational scheme of local density approximation together with dynamical
mean-field theory (LDA+DMFT). In contrast to well studied isostructural iron
arsenide high temper... | 1911.09300v2 |
2020-01-03 | Disappearance of the Fe K$α$ emission line in Ultra Compact X-ray Binaries 4U 1543-624 and Swift J1756.9-2508 | We investigate the long-term variability of the K$\alpha$ line of iron in the
spectra of two Ultra Compact X-ray Sources (UCXBs) with C/O-rich donors. We
revisit archival observations by five different X-ray telescopes, over a
~twenty year period. Adopting physically motivated models for the spectral
continuum, we prob... | 2001.00713v2 |
2020-01-06 | Are Faint Supernovae Responsible for Carbon-Enhanced Metal-Poor Stars? | Mixing and fallback models in faint supernova models are supposed to
reproduce the abundance patterns of observed carbon-enhanced metal-poor (CEMP)
stars in the Galactic halo. A fine tuning of the model parameters for
individual stars is required to reproduce the observed ratios of carbon to
iron. We focus on extremely... | 2001.01420v1 |
2020-02-09 | A detailed study on the reflection component for the Black Hole Candidate MAXI J1836-194 | We present a detailed spectral analysis of the black hole candidate MAXI
J1836-194. The source was caught in the intermediate state during its 2011
outburst by Suzaku and RXTE. We jointly fit the X-ray data from these two
missions using the relxill model to study the reflection component, and a steep
inner emissivity p... | 2002.03315v1 |
2020-02-11 | AstroSat/LAXPC view of GX 17+2: Spectral Evolution along the Z-track | In this paper, we present the first results obtained using $\sim$ 50 ks
observations of the bright low-mass X-ray binary (LMXB) GX 17+2 with Large Area
X-ray Proportional Counter (LAXPC) onboard {\it AstroSat}. The source traced
out a complete Z-track in the hardness intensity diagram (HID). The spectra at
different se... | 2002.04489v1 |
2020-02-18 | The Solar wind prevents re-accretion of debris after Mercury's giant impact | The planet Mercury possesses an anomalously large iron core, and a
correspondingly high bulk density. Numerous hypotheses have been proposed in
order to explain such a large iron content. A long-standing idea holds that
Mercury once possessed a larger silicate mantle which was removed by a giant
impact early in the the... | 2002.07847v2 |
2020-02-20 | Chemical Diversity of Super-Earths As a Consequence of Formation | Recent observations of rocky super-Earths have revealed an apparent wider
distribution of Fe/Mg ratios, or core to mantle ratios, than the planets in our
Solar System. This study aims to understand how much of the chemical diversity
in the super-Earth population can arise from giant impacts during planetary
formation. ... | 2002.09042v1 |
2020-04-17 | Thermodynamic signatures of an antiferromagnetic quantum critical point inside a superconducting dome | Recent experiments in unconventional superconductors, and in particular
iron-based materials, have reported evidence of an antiferromagnetic quantum
critical point (AFM-QCP) emerging inside the superconducting dome of the phase
diagram. Fluctuations associated with such an AFM-QCP are expected to promote
unusual temper... | 2004.08300v3 |
2020-04-22 | Crystal structures of Fe-gluconate | Fe-gluconate, Fe(C_6H_11O_7_2xH_2O is a well-known material widely used for
iron supplementation. On the other hand, it is used in food industry as a
coloring agent, in cosmetic industry for skin and nail conditioning and
metallurgy. Despite of wide range of applications its physical properties were
not studied extensi... | 2004.10535v3 |
2020-04-24 | Magnetism driven by strong electronic correlation in the heavily carrier-doped iron oxypnictide LaFeAsO$_{0.49}$H$_{0.51}$ | The magnetism of the second antiferromagnetic phase (AF2) arising in the
iron-based LaFeAsO$_{1-x}$H$_{x}$ superconductor for $x\gtrsim0.4$ was
investigated by muon spin rotation measurements under hydrostatic pressure up
to 2.6 GPa. The N\'eel temperature ($T_{\rm N}$) obtained for a sample with
$x=0.51$ exhibits cons... | 2004.11547v2 |
2020-05-16 | Vacancy-driven non-cubic local structure and magnetic anisotropy tailoring in Fe$_x$O-Fe$_{3-δ}$O$_4$ nanocrystals | In contrast to bulk materials, nanoscale crystal growth is critically
influenced by size- and shape-dependent properties. However, it is challenging
to decipher how stoichiometry, in the realm of mixed-valence elements, can act
to control physical properties, especially when complex bonding is implicated
by short and l... | 2005.07947v1 |
2020-05-28 | Rocklines as Cradles for Refractory Solids in the Protosolar Nebula | In our solar system, terrestrial planets and meteoritical matter exhibit
various bulk compositions. To understand this variety of compositions,
formation mechanisms of meteorites are usually investigated via a thermodynamic
approach that neglect the processes of transport throughout the protosolar
nebula. Here, we inve... | 2005.14116v3 |
2020-06-12 | SDSS J124043.01+671034.68: The partially burned remnant of a low-mass white dwarf that underwent thermonuclear ignition? | The white dwarf SDSS J124043.01+671034.68 (SDSS J1240+6710) was previously
found to have an oxygen-dominated atmosphere with significant traces of neon,
magnesium, and silicon. A possible origin via a violent late thermal pulse or
binary interactions have been suggested to explain this very unusual
photospheric composi... | 2006.07381v1 |
2020-06-15 | Opacity Driven Convection and Variability in Accretion Disks around Supermassive Black Holes | We study the structure of accretion disks around supermassive black holes in
the radial range $30\sim 100$ gravitational radii, using a three dimensional
radiation magneto-hydrodynamic simulation. For typical conditions in this
region of Active Galactic Nuclei (AGN), the Rosseland mean opacity is expected
to be larger ... | 2006.08657v1 |
2020-07-05 | Size and temperature dependent magnetization of iron nanoclusters | The magnetic behavior of bcc iron nanoclusters, with diameters between 2 and
8 nm, is investigated by means of spin dynamics (SD) simulations coupled to
molecular dynamics (MD-SD), using a distance-dependent exchange interaction.
Finite-size effects in the total magnetization as well as the influence of the
free surfac... | 2007.02230v2 |
2020-07-06 | On the Remarkable Superconductivity of FeSe and its Close Cousins | Emergent electronic phenomena in iron-based superconductors have been at the
forefront of condensed matter physics for more than a decade. Much has been
learned about the origin and intertwined roles of ordered phases, including
nematicity, magnetism, and superconductivity, in this fascinating class of
materials. In re... | 2007.02966v2 |
2020-07-11 | Site preference of Fe atoms in the olivine (Fe$_x$Mg$_{2-x}$)SiO$_4$ and its surface | Olivine is involved in many natural reactions and industrial reactions as a
catalyst. The catalytic ability is highly possible rely on the Fe$^{2+}$ in
olivine. We use density functional theory calculation and thermodynamics to
investigate the site preference of Fe atom in olivine which composition from
iron-rich to ir... | 2007.05851v3 |
2020-07-19 | A geometric approach to separate the effects of magnetic susceptibility and chemical shift/exchange in a phantom with isotropic magnetic susceptibility | Purpose: To separate the effects of magnetic susceptibility and chemical
shift/exchange in a phantom with isotropic magnetic susceptibility. To generate
a chemical shift/exchange-corrected quantitative susceptibility mapping (QSM)
result.
Theory and Methods: Magnetic susceptibility and chemical shift/exchange are
the... | 2007.09614v1 |
2020-07-21 | Interplay of itinerant magnetism and reentrant spin-glass behavior in Fe$_{x}$Cr$_{1-x}$ | When suppressing the itinerant antiferromagnetism in chromium by doping with
the isostructual itinerant ferromagnet iron, a dome of spin-glass behavior
emerges around a putative quantum critical point at an iron concentration $x
\approx 0.15$. Here, we report a comprehensive investigation of polycrystalline
samples of ... | 2007.10644v1 |
2021-02-03 | Stellar astrophysics in the near UV with VLT-CUBES | Alongside future observations with the new European Extremely Large Telescope
(ELT), optimised instruments on the 8-10m generation of telescopes will still
be competitive at 'ground UV' wavelengths (3000-4000 A). The near UV provides a
wealth of unique information on the nucleosynthesis of iron-peak elements,
molecules... | 2102.02205v1 |
2021-02-07 | Crystal structure and properties of iron-based spin-chain compound Ba9Fe3Se15 | We report the synthesis of a new quasi one-dimensional (1D) iron selenide.
Ba9Fe3Se15 was synthesized at high temperature and high pressure of 5.5 GPa and
systematically studied via structural, magnetic and transport measurements at
ambient and at high-pressures. Ba9Fe3Se15 crystallizes in a monoclinic
structure and co... | 2102.03708v1 |
2021-02-07 | The phonon mechanism explanation of the superconductivity dichotomy between FeSe and FeS monolayers on STO and other substrates | It was observed recently (K. Shigekawa et al, PNAS 116, 2470 (2019)) that
while monolayer iron chalcigenide FeSe on SrTiO3 (STO) substrate has a very
high critical temperature, its chemical and structural "twin" material FeS=STO
has a very low Tc if any. To explain this the substrate interfacial phonon
model of superco... | 2102.03854v1 |
2021-02-09 | Testing a Prototype 1U CubeSat on a Stratospheric Balloon Flight | High-altitude balloon experiments are becoming very popular among
universities and research institutes as they can be used for testing
instruments eventually intended for space, and for simple astronomical
observations of Solar System objects like the Moon, comets, and asteroids,
difficult to observe from the ground du... | 2102.04847v1 |
2021-02-21 | Meteoritic Proteins with Glycine, Iron and Lithium | We report that polymer amide [1] with a protein backbone of mainly glycine
units and iron is present in the CV3 meteorites Acfer 086, Allende and KABA.
The evidence for this is from particles of these meteorites after Folch
extraction being analyzed by MALDI mass spectrometry and from the 3D physical
structures that fo... | 2102.10700v1 |
2021-02-22 | Estimating SARS-CoV-2 Infections from Deaths, Confirmed Cases, Tests, and Random Surveys | There are many sources of data giving information about the number of
SARS-CoV-2 infections in the population, but all have major drawbacks,
including biases and delayed reporting. For example, the number of confirmed
cases largely underestimates the number of infections, deaths lag infections
substantially, while test... | 2102.10741v1 |
2021-06-03 | Ultrafast demagnetization of iron induced by optical vs terahertz pulses | We study ultrafast magnetization quenching of ferromagnetic iron following
excitation by an optical vs a terahertz pump pulse. While the optical pump
(photon energy of 3.1 eV) induces a strongly nonthermal electron distribution,
terahertz excitation (~4 meV) results in a quasi-thermal perturbation of the
electron popul... | 2106.01967v1 |
2021-06-14 | Spin-pure Stochastic-CASSCF via GUGA-FCIQMC applied to Iron Sulfur Clusters | In this work we demonstrate how to compute the one- and two-body reduced
density matrices within the spin-adapted full configuration interaction quantum
Monte Carlo (FCIQMC) method, which is based on the graphical unitary group
approach (GUGA). This allows us to use GUGA-FCIQMC as a spin-pure configuration
interaction ... | 2106.07775v1 |
2021-06-22 | A two-stage robust optimization approach for oxygen flexible distribution under uncertainty in iron and steel plants | Oxygen optimal distribution is one of the most important energy management
problems in the modern iron and steel industry. Normally, the supply of the
energy generation system is determined by the energy demand of manufacturing
processes. However, the balance between supply and demand fluctuates frequently
due to the u... | 2106.11635v1 |
2021-06-23 | Correlation Between Spin and Orbital Dynamics During Laser-Induced Femtosecond Demagnetization | Spin and orbital angular momenta are two intrinsic properties of an electron
and are responsible for the physics of a solid. How the spin and orbital evolve
with respect to each other on several hundred femtoseconds is largely unknown,
but it is at the center of laser-induced ultrafast demagnetization. In this
paper, w... | 2106.12679v1 |
2021-07-09 | Rapid interrogation of special nuclear materials by combining scattering and transmission nuclear resonance fluorescence spectroscopy | The smuggling of special nuclear materials (SNMs) across national borders is
becoming a serious threat to nuclear nonproliferation. This paper presents a
feasibility study on the rapid interrogation of concealed SNMs by combining
scattering and transmission nuclear resonance fluorescence (sNRF and tNRF)
spectroscopy. I... | 2107.04379v1 |
2021-11-01 | Spectrum evolution and chirping of laser-induced spin wave packets in thin iron films | We present the experimental study of ultrafast optical excitation of
magnetostatic surface spin wave (MSSW) packets and their spectral properties in
thin films of pure iron. As the packets leave the excitation area and propagate
in space, their spectra evolve non-trivially. Particularly, low or high
frequency component... | 2111.00983v2 |
2021-11-08 | Microstructure, grain boundary evolution and anisotropic Fe segregation in (0001) textured Ti thin films | The structure and chemistry of grain boundaries (GBs) are crucial in
determining polycrystalline materials' properties. Faceting and solute
segregation to minimize the GB energy is a commonly observed phenomenon. In
this paper, a deposition process to obtain pure tilt GBs in titanium (Ti) thin
films is presented. By in... | 2111.04606v1 |
2021-11-08 | The MOBH35 metal-organic barrier heights reconsidered: performance of local-orbital coupled cluster approaches in different static correlation regimes | We have revisited the MOBH35 (Metal-Organic Barrier Heights, 35 reactions)
benchmark [Iron, M. A.; Janes, T. J. Phys. Chem. A 2019, 123 (17), 3761-3781;
ibid. 2019, 123, 6379-6380] for realistic organometallic catalytic reactions,
using both canonical CCSD(T) and localized orbital approximations to it. For
low levels o... | 2111.04777v3 |
2021-11-24 | Metallicity of the globular cluster NGC 6388 from high resolution spectra of more than 160 giant stars | NGC 6388 is one of the most massive Galactic globular clusters (GC) and it is
an old, metal-rich, Galactic bulge cluster. By exploiting previous
spectroscopic observations we were able to bypass the uncertainties in
membership related to the strong field stars contamination. We present the
abundance analysis of 12 new ... | 2111.12721v1 |
2022-06-30 | SRG/eROSITA discovery of a radio faint X-ray candidate supernova remnant SRGe J003602.3+605421=G121.1-1.9 | We report the discovery of a candidate X-ray supernova remnant SRGe
J003602.3+605421=G121.1-1.9 in the course of \textit{SRG}/eROSITA all-sky
survey. The object is located at (l,b)=(121.1$^\circ$,-1.9$^\circ$), is
$\approx36$ arcmin in angular size and has a nearly circular shape. Clear
variations in spectral shape of ... | 2207.00064v2 |
2022-07-20 | Dislocation Majorana Bound States in Iron-based Superconductors | We show that lattice dislocations of topological iron-based superconductors
such as FeTe$_{1-x}$Se$_x$ will intrinsically trap non-Abelian Majorana
quasiparticles, in the absence of any external magnetic field. Our theory is
motivated by the recent experimental observations of normal-state topology and
surface magnetis... | 2207.10113v2 |
2017-04-18 | Structure, magnetic susceptibility and specific heat of the spin-orbital-liquid candidate FeSc2S4 : Influence of fe off-stoichiometry | We report structural, susceptibility and specific heat studies of
stoichiometric and off-stoichiometric poly- and single crystals of the A-site
spinel compound FeSc2S4. In stoichiometric samples no long-range magnetic order
is found down to 1.8 K. The magnetic susceptibility of these samples is field
independent in the... | 1704.05275v1 |
2017-04-20 | Experimental Demonstration of the Sign Reversal of the Order Parameter in (Li1-xFex)OHFe1-yZnySe | Iron pnictides are the only known family of unconventional high-temperature
superconductors besides cuprates. Until recently, it was widely accepted that
superconductivity is spin-fluctuation driven and intimately related to their
fermiology, specifically, hole and electron pockets separated by the same wave
vector tha... | 1704.06141v1 |
2017-04-25 | Role of multiorbital effects in the magnetic phase diagram of iron-pnictides | We elucidate the pivotal role of the bandstructure's orbital content in
deciding the type of commensurate magnetic order stabilized within the
itinerant scenario of iron-pnictides. Recent experimental findings in the
tetragonal magnetic phase attest to the existence of the so-called charge and
spin ordered density wave... | 1704.07862v2 |
2017-05-18 | Effects of the Functional Group on the Lithium Ions Across the Port of Carbon Nanotube | The mean axial velocity of lithium irons across the entrance of carbon
nanotube VLi is an important factor for the charge-discharge performances of
rechargeable Lithium battery. The molecular dynamics simulation method is
adopted to evaluate the factors and their effects on VLi which include the
diameter of carbon nano... | 1705.06650v1 |
2017-05-27 | High transport current superconductivity in powder-in-tube Ba0.6K0.4Fe2As2 tapes at 27 tesla | The high upper critical field and low anisotropy of iron-based
superconductors make them being particularly attractive for high-field
applications. However, the current carrying capability needs to be enhanced by
overcoming the weak-link effect between misaligned grains inside wire and tape
conductors. Here we demonstr... | 1705.09788v1 |
2017-05-29 | Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor | Ultrasonic measurements have been carried out to investigate the critical
dynamics of structural and superconducting transitions due to degenerate
orbital bands in iron pnictide compounds with the formula
Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$. The attenuation coefficient
$\alpha_{\mathrm{L}[110]}$ of the longitudinal ultrason... | 1705.10057v1 |
2017-05-31 | Terahertz spin currents and inverse spin Hall effect in thin-film heterostructures containing complex magnetic compounds | Terahertz emission spectroscopy of ultrathin multilayers of magnetic and
heavy metals has recently attracted much interest. This method not only
provides fundamental insights into photoinduced spin transport and spin-orbit
interaction at highest frequencies but has also paved the way to applications
such as efficient a... | 1705.11069v2 |
2017-06-02 | Quenching current by flux-flow instability in iron-chalcogenides thin films | The stability against quench is one of the main issue to be pursued in a
superconducting material which should be able to perform at very high levels of
current densities. Here we focus on the connection between the critical current
$I_c$ and the quenching current $I^*$ associated to the so-called flux-flow
instability... | 1706.00772v1 |
2017-06-19 | Evidence for Majorana bound state in an iron-based superconductor | The search for Majorana bound state (MBS) has recently emerged as one of the
most active research areas in condensed matter physics, fueled by the prospect
of using its non-Abelian statistics for robust quantum computation. A highly
sought-after platform for MBS is two-dimensional topological superconductors,
where MBS... | 1706.06074v3 |
2017-06-25 | Frustration-driven C4 symmetric orders in a hetero-structured iron-based superconductor | A subtle balance between competing interactions in strongly correlated
systems can be easily tipped by additional interfacial interactions in a
heterostructure. This often induces exotic phases with unprecedented
properties, as recently exemplified by high-Tc superconductivity in FeSe
monolayer on the nonmagnetic SrTiO... | 1706.08157v1 |
2017-06-27 | Magnetic fluctuations and superconducting properties of CaKFe4As4 studied by 75As NMR | We report $^{75}$As nuclear magnetic resonance (NMR) studies on a new
iron-based superconductor CaKFe$_4$As$_4$ with $T_{\rm c}$ = 35 K. $^{75}$As
NMR spectra show two distinct lines corresponding to the As(1) and As(2) sites
close to the K and Ca layers, respectively, revealing that K and Ca layers are
well ordered wi... | 1706.09075v2 |
2018-02-05 | Discrete superconducting phases in FeSe-derived superconductors | A general feature of unconventional superconductors is the existence of a
superconducting dome in the phase diagram as a function of carrier
concentration. For the simplest iron-based superconductor FeSe (with transition
temperature Tc ~ 8 K), its Tc can be greatly enhanced by doping electrons via
many routes, even up ... | 1802.01484v1 |
2018-02-06 | Imaging Orbital-selective Quasiparticles in the Hund's Metal State of FeSe | Strong electronic correlations, emerging from the parent Mott insulator
phase, are key to copper-based high temperature superconductivity (HTS). By
contrast, the parent phase of iron-based HTS is never a correlated insulator.
But this distinction may be deceptive because Fe has five active d-orbitals
while Cu has only ... | 1802.02266v2 |
2018-02-20 | Monte-Carlo simulations of the detailed iron absorption line profiles from thermal winds in X-ray binaries | Blue shifted absorption lines from highly ionised iron are seen in some high
inclination X-ray binary systems, indicating the presence of an equatorial disc
wind. This launch mechanism is under debate, but thermal driving should be
ubiquitous. X-ray irradiation from the central source heats disc surface,
forming a wind... | 1802.07019v1 |
2018-07-04 | Doping effects of Cr on the physical properties of BaFe$_{1.9-x}$Ni$_{0.1}$Cr$_{x}$As$_{2}$ | We present a systematic study on the heavily Cr doped iron pnictides
BaFe$_{1.9-x}$Ni$_{0.1}$Cr$_{x}$As$_{2}$ by using elastic neutron scattering,
high-resolution synchrotron X-ray diffraction (XRD), resistivity and Hall
transport measurements. When the Cr concentration increases from $x=$ 0 to 0.8,
neutron diffraction... | 1807.01612v1 |
2018-07-17 | Chemical Compositions of Field and Globular Cluster RR Lyrae Stars: I. NGC 3201 | We present a detailed spectroscopic analysis of horizontal branch stars in
the globular cluster NGC 3201. We collected optical (4580-5330 A), high
resolution (~34,000), high signal-to-noise ratio (~200) spectra for eleven RR
Lyrae stars and one red horizontal branch star with the multifiber spectrograph
M2FS at the 6.5... | 1807.06681v1 |
2018-07-27 | Relativistic reflection from accretion disks in the population of Active Galactic Nuclei at z=0.5-4 | We report the detection of relativistically broadened iron K alpha emission
in the X-ray spectra of AGN detected in the 4Ms CDF-S. Using the Bayesian X-ray
analysis (BXA) package, we fit 199 hard band (2-7 keV) selected sources in the
redshift range z=0.5--4 with three models: (i) an absorbed power-law, (ii) the
first ... | 1807.10677v1 |
2018-08-10 | Majority carrier type inversion in FeSe family and "doped semimetal" scheme in iron-based superconductors | The field and temperature dependencies of the longitudinal and Hall
resistivity have been studied for high-quality FeSe${}_{1-x}$S${}_{x}$ (x up to
0.14) single crystals. Quasiclassical analysis of the obtained data indicates a
strong variation of the electron and hole concentrations under the studied
isovalent substit... | 1808.03551v2 |
2018-08-11 | Physical conditions for the r-process I. radioactive energy sources of kilonovae | Radioactive energies from unstable nuclei made in the ejecta of neutron star
mergers play principal roles in powering kilonovae. In previous studies
power-law-type heating rates (e.g., ~ t^-1.3) have frequently been used, which
may be inadequate if the ejecta are dominated by nuclei other than the A ~ 130
region. We co... | 1808.03763v2 |
2018-08-15 | c-axis pressure induced antiferromagnetic order in optimally P-doped BaFe2(As0.70P0.30)2 superconductor | Superconductivity in BaFe2(As1-xPx)2 iron pnictides emerges when its in-plane
two-dimensional (2D) orthorhombic lattice distortion associated with nematic
phase at Ts and three-dimensional (3D) collinear antiferromagnetic (AF) order
at TN (Ts = TN) are gradually suppressed with increasing x, reaching optimal
supercondu... | 1808.05153v1 |
2018-08-16 | Relativistic Tidal Disruption and Nuclear Ignition of White Dwarf Stars by Intermediate Mass Black Holes | We present results from general relativistic calculations of the tidal
disruption of white dwarf stars from near encounters with intermediate mass
black holes. We follow the evolution of 0.2 and $0.6 M_\odot$ stars on
parabolic trajectories that approach $10^3$ - $10^4 M_\odot$ black holes as
close as a few Schwarzschi... | 1808.05664v1 |
2018-08-18 | Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe$_4$As$_4$ | We present a comprehensive study of the critical current densities and the
superconducting vortex phase diagram in the stoichiometric superconductor
CaKFe$_4$As$_4$ which has a critical temperature of 35 K. We performed detailed
magnetization measurements both of high quality single crystals for different
orientations ... | 1808.06072v1 |
2018-08-19 | Local Electronic Structure of Interstitial Hydrogen in Iron Disulfide | The electronic structure of interstitial hydrogen in a compound semiconductor
FeS$_2$ (naturally $n$-type) is inferred from a muon study. An implanted muon
(Mu, a pseudo-hydrogen) forms electronically different defect centers discerned
by the hyperfine parameter ($\omega_{\rm hf}$). A body of evidence indicates
that on... | 1808.06153v1 |
2018-08-23 | Correlation between non-Fermi-liquid behavior and superconductivity in (Ca, La)(Fe,Co)As2 iron arsenides: A high-pressure study | Non-Fermi-liquid (NFL) phenomena associated with correlation effects have
been widely observed in the phase diagrams of unconventional superconducting
families. Exploration of the correlation between the normal state NFL,
regardless of its microscopic origins, and the superconductivity has been
argued as a key to unvei... | 1808.07609v1 |
2018-08-26 | Intertwined Spin and Orbital Density Waves in MnP Uncovered by Resonant Soft X-ray Scattering | Unconventional superconductors are often characterized by numerous competing
and even intertwined orders in their phase diagrams. In particular, the
electronic nematic phases, which spontaneously break rotational symmetry and
often simultaneously involve spin, charge and/or orbital orders, appear
conspicuously in both ... | 1808.08562v1 |
2018-10-18 | Human-sized Magnetic Particle Imaging for Brain Applications | Determining the brain perfusion is an important task for the diagnosis and
treatment of vascular diseases such as occlusions and intracerebral
haemorrhage. Even after successful diagnosis and treatment, there is a high
risk of restenosis or rebleeding such that patients need intense and frequent
attention in the days a... | 1810.07987v1 |
2019-01-08 | Observation of half-integer level shift of vortex bound states in an iron-based superconductor | Vortices in topological superconductors host Majorana zero modes (MZMs),
which are proposed to be building blocks of fault-tolerant topological quantum
computers. Recently, a new single-material platform for realizing MZM has been
discovered in iron-based superconductors, without involving hybrid
semiconductor-supercon... | 1901.02293v1 |
2019-01-19 | Study of the X-ray properties of the neutron-star binary 4U 1728$-$34 from the soft to hard state | We studied five XMM-Newton observations of the neutron-star binary 4U
1728$-$34 covering the hard, intermediate and soft spectral states. By jointly
fitting the spectra with several reflection models, we obtained an inclination
angle of 25$-$53$\deg$ and an iron abundance up to 10 times the solar. From the
fits with re... | 1901.06473v1 |
2019-01-28 | Super-Eddington accretion onto the Galactic ultraluminous X-ray pulsar Swift J0243.6+6124 | We report on the spectral behavior of the first Galactic ultraluminous X-ray
pulsar Swift J0243.6+6124 with NuSTAR observations during its 2017-2018
outburst. At sub-Eddington levels, the source spectrum is characterized by
three emission components, respectively from the accretion column, the hot
spot, and a broad iro... | 1901.09485v1 |
2019-04-01 | A Chandra and ALMA Study of X-ray-irradiated Gas in the Central ~100 pc of the Circinus Galaxy | We report a study of X-ray-irradiated gas in the central ~100 pc of the
Circinus galaxy, hosting a Compton-thick active galactic nucleus (AGN), at
10-pc resolution using Chandra and ALMA. Based on ~200 ksec Chandra/ACIS-S
data, we created an image of the Fe Kalpha line at 6.4 keV, tracing
X-ray-irradiated dense gas. Th... | 1904.01144v1 |
2019-04-12 | Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor | Majorana zero-modes (MZMs) are spatially-localized zero-energy fractional
quasiparticles with non-Abelian braiding statistics that hold a great promise
for topological quantum computing. Due to its particle-antiparticle
equivalence, an MZM exhibits robust resonant Andreev reflection and 2e2/h
quantized conductance at l... | 1904.06124v2 |
2019-04-14 | Impact of the first order antiferromagnetic phase transition on the paramagnetic spin excitations and nematic phase of SrFe$_2$As$_2$ | Understanding the nature of the electronic nematic phase in iron pnictide
superconductors is important for elucidating its impact on high-temperature
superconductivity. Here we use transport and inelastic neutron scattering to
study spin excitations and in-plane resistivity anisotropy in uniaxial pressure
detwinned BaF... | 1904.06743v1 |
2019-06-13 | The influence of antiferromagnetism, soft out-of plane phonons and heavy electrons on the superconducting pairing mechanism of Ba1-xKxFe2As2 | Based on ab-initio calculated parameters, we apply a theoretical model on the
iron-based BaFe2As2 superconductor that takes into account dramatic
enhancements of the electron-phonon coupling of soft transverse phonons in the
FeAs layers and antiferromagnetism. Our model is able to reproduce the Tc
values of BaFe2As2 fo... | 1906.05789v1 |
2019-06-24 | Melting of vortex lattice in magnetic superconductor $\mathrm{Rb}\mathrm{Eu}\mathrm{Fe}_{4}\mathrm{As}_{4}$ | The iron-based superconductors are characterized by strong fluctuations due
to high transition temperatures and small coherence lengths. We investigate
fluctuation behavior in the magnetic iron-pnictide superconductor
$\mathrm{Rb}\mathrm{Eu}\mathrm{Fe}_{4}\mathrm{As}_{4}$ by calorimetry and
transport. We find that the ... | 1906.10236v2 |
2019-06-26 | Near 100% CO Selectivity in Nanoscaled Iron-Based Oxygen Carriers for Chemical Looping Methane Partial Oxidation | Chemical looping methane partial oxidation provides an energy and cost
effective route for methane utilization. However, there is considerable CO2
co-production in state-of-the-art chemical looping systems, rendering a
decreased productivity in value-added fuels or chemicals. In this work, we show
that the co-productio... | 1906.11160v1 |
2019-07-15 | Stellar atmospheric parameters for 754 spectra from the X-shooter Spectral Library | The X-shooter Spectral Library (XSL) is an empirical stellar library at
medium spectral resolution covering the wavelength range from 3000 \AA to 24
800 \AA. This library aims to provide a benchmark for stellar population
studies. In this work, we present a uniform set of stellar atmospheric
parameters, effective tempe... | 1907.06391v1 |
2019-07-15 | Neutron powder diffraction study on the non-superconducting phases of ThFeAsN$_{1-x}$O$_x$ ($x=0.15, 0.6$) iron pnictide | We use neutron powder diffraction to study on the non-superconducting phases
of ThFeAsN$_{1-x}$O$_x$ with $x=0.15, 0.6$. In our previous results on the
superconducting phase ThFeAsN with $T_c=$ 30 K, no magnetic transition is
observed by cooling down to 6 K, and possible oxygen occupancy at the nitrogen
site is shown i... | 1907.06531v1 |
2019-07-17 | Detailed spectroscopic and photometric study of three detached eclipsing binaries | Detached eclipsing binaries are remarkable systems to provide accurate
fundamental stellar parameters. The fundamental stellar parameters and the
metallicity values of stellar systems are needed to deeply understand the
stellar evolution and formation. In this study, we focus on the detailed
spectroscopic and photometr... | 1907.07560v1 |
2019-07-29 | Near-linear Scaling in DMRG-based Tailored Coupled Clusters: An Implementation of DLPNO-TCCSD and DLPNO-TCCSD(T) | We present a new implementation of DMRG-based tailored coupled clusters
method (TCCSD), which employs the domain-based local pair natural orbital
approach (DLPNO-TCCSD). Compared to the previous LPNO version of the method,
the new implementation is more accurate, offers more favorable scaling and
provides more consiste... | 1907.13466v3 |
2019-10-02 | Nuclear Ignition of White Dwarf Stars by Relativistic Encounters with Rotating Intermediate Mass Black Holes | We present results from general relativistic calculations of nuclear ignition
in white dwarf stars triggered by near encounters with rotating intermediate
mass black holes with different spin and alignment parameters. These encounters
create thermonuclear environments characteristic of Type Ia supernovae capable
of pro... | 1910.01054v1 |
2019-10-16 | Controlling Ferromagnetic Ground States and Solitons in Thin Films and Nanowires built from Iron Phthalocyanine Chains | Iron phthalocyanine (FePc) is a molecular semiconductor whose building blocks
are one-dimensional ferromagnetic chains. We show that its optical and magnetic
properties are controlled by the growth strategy, obtaining extremely high
coercivities of over 1 T and modulating the exchange constant between 15 and 29
K throu... | 1910.07229v1 |
2019-10-18 | An ionised accretion disc wind in Hercules X-1 | Hercules X-1 is one of the best studied highly magnetised neutron star X-ray
binaries with a wealth of archival data. We present the discovery of an ionised
wind in its X-ray spectrum when the source is in the high state. The wind
detection is statistically significant in most of the XMM-Newton observations,
with veloc... | 1910.08337v2 |
2019-10-20 | PUSHing core-collapse supernovae to explosions in spherical symmetry IV: Explodability, remnant properties and nucleosynthesis yields of low metallicity stars | In this fourth paper of the series, we use the parametrized, spherically
symmetric explosion method PUSH to perform a systematic study of two sets of
non-rotating stellar progenitor models. Our study includes pre-explosion models
with metallicities Z=0 and Z=Z$_{\odot}\times 10^{-4}$ and covers a progenitor
mass range ... | 1910.08958v2 |
2019-12-08 | The vertical Na-O relation in the bulge globular cluster NGC 6553 | In this article, we present a detailed chemical analysis of seven red giant
members of NGC 6553 using high-resolution spectroscopy from VLT FLAMES. We
obtained the stellar parameters (Teff, Log(g), vt, [Fe/H]) of these stars from
the spectra, and we measured the chemical abundance for 20 elements, including
light eleme... | 1912.03742v2 |
2019-12-10 | Magnetic properties of thin epitaxial Pd$_{1-x}$Fe$_x$ alloy films | In the paper we present the results of extensive studies of palladium-rich
Pd1-xFex alloy films epitaxially grown on MgO single-crystal substrate. In a
composition range of x = 0.01-0.07 these materials are soft ferromagnets, the
saturation magnetization and magnetic anisotropy of which can be tuned by its
composition.... | 1912.04852v1 |
2019-12-16 | High-Temperature Quantum Anomalous Hall Insulators in Lithium-Decorated Iron-Based Superconductor Materials | Quantum anomalous Hall (QAH) insulator is the key material to study emergent
topological quantum effects, but its ultralow working temperature limits
experiments. Here, by first-principles calculations, we find a family of stable
two-dimensional (2D) structures generated by lithium decoration of layered
iron-based supe... | 1912.07461v4 |
2020-03-06 | Ab initio theory of graphene-iron(II) phthalocyanine hybrid systems as scalable molecular spintronics | Graphene - transition metal phthalocyanine (G-MPc) hybrid systems constitute
promising platforms for densely-packed single-molecule magnets (SMMs). Here, we
selected iron(II) phthalocyanine (FePc) and investigated its interaction with
pristine and defective graphene layers employing density functional theory. Our
calcu... | 2003.03189v1 |
2020-03-22 | A statistical study of the plasma and composition distribution inside magnetic clouds: 1998-2011 | A comprehensive analysis of plasma and composition characteristics inside
magnetic clouds (MCs) observed by the Advanced Composition Explorer (ACE)
spacecraft from 1998 February to 2011 August is presented. The results show
that MCs have specific interior structures, and MCs of different speeds show
differences in comp... | 2003.09965v1 |
2020-08-03 | When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe$_{4}$As$_{4}$ | In the novel stoichiometric iron-based material RbEuFe$_{4}$As$_{4}$
superconductivity coexists with a peculiar long-range magnetic order of Eu 4f
states. Using angle-resolved photoemission spectroscopy, we reveal a complex
three dimensional electronic structure and compare it with density functional
theory calculation... | 2008.00736v1 |
2020-08-10 | On The Development of Multidimensional Progenitor Models For Core-collapse Supernovae | Multidimensional hydrodynamic simulations of shell convection in massive
stars suggest the development of aspherical perturbations that may be amplified
during iron core-collapse. These perturbations have a crucial and qualitative
impact on the delayed neutrino-driven core-collapse supernova explosion
mechanism by incr... | 2008.04266v1 |
2020-08-31 | Creep deformation of WC hardmetals with iron-based binders | Iron is a candidate to replace cobalt in WC hardmetals, due to its lower cost
and toxicity. A WC-FeCr hardmetal was compression tested at 900-1200 {\deg}C.
Particular attention is paid to the steady-state creep rates and
stress-exponents (n) during isostress treatments. Three regimes of stress
dependence are observed. ... | 2008.13565v1 |
2020-09-02 | Multimodal assessment of nigrosomal degeneration in Parkinson's disease | Background: Approximately forty percent of all dopaminergic neurons in SNpc
are located in five dense neuronal clusters, named nigrosomes. T2- or
T2*-weighted images are used to delineate the largest nigrosome, named
nigrosome-1. In these images, nigrosome-1 is a hyperintense region in the
caudal and dorsal portion of ... | 2009.01378v1 |
2020-09-09 | Accretion disk's magnetic field controlled the composition of the terrestrial planets | Chondrites, the building blocks of the terrestrial planets, have mass and
atomic proportions of oxygen, iron, magnesium, and silicon totaling $\geq$90\%
and variable Mg/Si ($\sim$25\%), Fe/Si (factor of $\geq$2), and Fe/O (factor of
$\geq$3). The Earth and terrestrial planets (Mercury, Venus, and Mars) are
differentiat... | 2009.04311v1 |
2020-09-11 | Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx | Isoelectronic substitution is an ideal tuning parameter to alter electronic
states and correlations in iron-based superconductors. As this substitution
takes place outside the conducting Fe planes, the electronic behaviour is less
affected by the impurity scattering experimentally and relevant key electronic
parameters... | 2009.05523v1 |
2020-09-21 | The Impact of Outflows driven by Active Galactic Nuclei on Metals in and around Galaxies | Metals in the hot gaseous halos of galaxies encode the history of star
formation as well as the feedback processes that eject metals from the
galaxies. X-ray observations suggest that massive galaxies have extended
distributions of metals in their gas halos. We present predictions for the
metal properties of massive ga... | 2009.10184v1 |
2020-09-24 | Large magnetoresistance in the iron-free pnictide superconductor LaRu$_2$P$_2$ | The magnetoresistance of iron pnictide superconductors is often dominated by
electron-electron correlations and deviates from the H$^2$ or saturating
behaviors expected for uncorrelated metals. Contrary to similar Fe-based
pnictide systems, the superconductor LaRu$_2$P$_2$ (T$_c$ = 4 K) shows no
enhancement of electron... | 2009.11585v1 |
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