publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2014-02-11 | Iron-line and continuum variations in the XMM-Newton and Suzaku spectra of the neutron-star low-mass X-ray binary 4U 1636-53 | We used six simultaneous XMM-Newton and Rossi X-ray Timing Explorer plus five
Suzaku observations to study the continuum spectrum and the iron emission line
in the neutron-star low-mass X-ray binary 4U 1636-53. We modelled the spectra
with two thermal components (representing the accretion disc and boundary
layer), a C... | 1402.2350v1 |
2014-06-16 | Simulation Studies for Electromagnetic Design of INO ICAL Magnet and its Response to Muons | The iron calorimeter (ICAL) detector at the India-based Neutrino Observatory
(INO) will be used to measure neutrino mass hierarchy. The magnet in the ICAL
detector will be used to distinguish the {\mu^-} and {\mu^+} events induced by
{\nu_{\mu}} and {\bar{\nu_{\mu}}}, respectively. Due to the importance of the
magnet i... | 1406.3965v3 |
2014-08-20 | Nuclear inputs of key iron isotopes for core-collapse modeling and simulation | From the modeling and simulation results of presupernova evolution of massive
stars, it was found that isotopes of iron, $^{54,55,56}$Fe, play a significant
role inside the stellar cores, primarily decreasing the electron-to-baryon
ratio ($Y_{e}$) mainly via electron capture processes thereby reducing the
pressure supp... | 1408.4534v1 |
2014-09-08 | Electronic structure in one-Fe Brillouin zone of iron-pnictide superconductor CsFe$_2$As$_2$ | The multiband nature of iron-pnictide superconductors is one of the keys to
the understanding of their intriguing behavior. The electronic and magnetic
properties heavily rely on the multiband interactions between different
electron and hole pockets near the Fermi level. At the fundamental level,
though many theoretica... | 1409.2300v2 |
2014-11-20 | Significant contribution of As 4p orbitals to the low-lying electronic structure of 112-type iron-based superconductor Ca0.9La0.1FeAs2 | We report a systematic polarization-dependent angle-resolved photoemission
spectroscopy study of the three-dimensional electronic structure of the
recently discovered 112-type iron-based superconductor Ca1-xLaxFeAs2 (x = 0.1).
Besides the commonly reported three hole-like and two electron-like bands in
iron-based super... | 1411.5525v1 |
2015-01-23 | Tensile strain-induced softening of iron at high temperature | In weakly ferromagnetic materials, already small changes in the atomic
configuration triggered by temperature or chemistry can alter the magnetic
interactions responsible for the non-random atomic-spin orientation. Different
magnetic states, in turn, can give rise to substantially different macroscopic
properties. A cl... | 1501.05774v2 |
2015-01-23 | Quasiparticles in Iron Silicides: GW versus LDA | The angle-resolved photoemission spectroscopy, ARPES, is able to measure both
the spectra and spectral weights of the quasiparticles in solids. Although it
is common to interpret the band structure obtained within the
density-functional-theory based methods as quasi-particle spectra, these
methods are not able to provi... | 1501.05898v3 |
2015-01-27 | Direct observation of nanoscale interface phase in the superconducting chalcogenide K$_{x}$Fe$_{2-y}$Se$_2$ with intrinsic phase separation | We have used scanning micro x-ray diffraction to characterize different
phases in superconducting K$_{x}$Fe$_{2-y}$Se$_2$ as a function of temperature,
unveiling the thermal evolution across the superconducting transition
temperature (T$_c\sim$32 K), phase separation temperature (T$_{ps}\sim$520 K)
and iron-vacancy ord... | 1501.06745v1 |
2015-02-26 | Strong Interplay between Stripe Spin Fluctuations, Nematicity and Superconductivity in FeSe | Elucidating the microscopic origin of nematic order in iron-based
superconducting materials is important because the interactions that drive
nematic order may also mediate the Cooper pairing. Nematic order breaks
fourfold rotational symmetry in the iron plane, which is believed to be driven
by either orbital or spin de... | 1502.07544v1 |
2015-03-18 | Broad Iron Emission from Gravitationally Lensed Quasars Observed by Chandra | Recent work has demonstrated the potential of gravitationally lensed quasars
to extend measurements of black hole spin out to high-redshift with the current
generation of X-ray observatories. Here we present an analysis of a large
sample of 27 lensed quasars in the redshift range 1.0<z<4.5 observed with
Chandra, utiliz... | 1503.05255v1 |
2015-05-12 | Experimental Observation of Incoherent-Coherent Crossover and Orbital Dependent Band Renormalization in Iron Chalcogenide Superconductors | The level of electronic correlation has been one of the key questions in
understanding the nature of superconductivity. Among the iron-based
superconductors, the iron chalcogenide family exhibits the strongest electron
correlations. To gauge the correlation strength, we performed systematic
angle-resolved photoemission... | 1505.03074v1 |
2015-06-02 | Development of high-performance iron-based superconducting wires and tapes | Conventional powder-in-tube (PIT) method has been the most effective
technique for fabricating iron-based superconducting wires and tapes.
Tremendous advances have been made during the last few years, especially for
122 family pnictide tapes. Here we review some of the most recent and
significant developments in making... | 1506.00792v2 |
2015-07-06 | A chemical trompe-l'œil: no iron spread in the globular cluster M22 | We present the analysis of high-resolution spectra obtained with UVES and
UVES-FLAMES at the Very Large Telescope of 17 giants in the globular cluster
M22, a stellar system suspected to have an intrinsic spread in the iron
abundance. We find that when surface gravities are derived spectroscopically
(by imposing to obta... | 1507.01596v1 |
2015-07-09 | O and Fe abundance correlations and distributions inferred for the thick and thin disk | A linear [Fe/H]-[O/H] relation is found for different stellar populations in
the Galaxy (halo, thick disk, thin disk) from a data sample obtained in a
recent investigation (Ram{\'\i}rez et al. 2013). These correlations support
previous results inferred from poorer samples: stars display a "main sequence"
expressed as [... | 1507.02405v1 |
2015-08-07 | Spin reorientation driven by the interplay between spin-orbit coupling and Hund's rule coupling in iron pnictides | In most magnetically-ordered iron pnictides, the magnetic moments lie in the
FeAs planes, parallel to the modulation direction of the spin stripes. However,
recent experiments in hole-doped iron pnictides have observed a reorientation
of the magnetic moments from in-plane to out-of-plane. Interestingly, this
reorientat... | 1508.01763v4 |
2015-08-26 | Spatial competition of the ground states in 1111 iron pnictides | Using nuclear quadrupole resonance, the phase diagram of 1111
$R$FeAsO$_{1-x}$F$_x$ ($R$$=$La, Ce, Sm) iron pnictides is constructed as a
function of the local charge distribution in the paramagnetic state, which
features low-doping-like (LD-like) and high-doping-like (HD-like) regions.
Compounds based on magnetic rare... | 1508.06532v1 |
2015-10-04 | To the measurement of the radius via an electron scattering | We propose an experiment for an accurate measurement of the proton radius. A
key feature of our proposal is an iron-free magnetic spectrometer. Projected
systematics uncertainties will allow a 1% level accuracy for the $r_p$ value. | 1510.00890v1 |
2015-10-28 | Superconducting state in Fe-based materials and spin-fluctuation theory of pairing | Short review of the spin-fluctuation theory of superconductive pairing in
iron-based pnictides and chalcogenides. | 1510.08279v1 |
2015-11-02 | Comment on 'A new nanoscale metastable iron phase in carbon steels' | We show that the selected area diffraction patterns presented in a recent
paper (T. Liu et al. Sci. Rep. 2015 5, 15331) do not prove the existence of a
new hexagonal phase in martensitic steels. They can be actually simulated by
twin effects. | 1511.00591v1 |
2015-12-08 | Photodisintegrated gamma rays and neutrinos from heavy nuclei in the gamma-ray burst jet of GRB 130427A | Detection of ~ 0.1-70 GeV prompt gamma-ray emission from the exceptionally
bright gamma-ray burst (GRB) 130427A by the Fermi-Large Area Telescope provides
an opportunity to explore the physical processes of GeV gamma-ray emission from
the GRB jets. In this work we discuss interactions of Iron and Oxygen nuclei
with obs... | 1512.02434v3 |
2015-12-10 | Robust Zero Energy Bound States Localized at Magnetic Impurities in Iron-based Superconductors | We investigate the effect of spin-orbit coupling on the in-gap bound states
localized at magnetic impurities in multi-band superconductors with
unconventional (sign-changed) and conventional (sign-unchanged) $s$-wave
pairing symmetry, which may be relevant to iron-based superconductors. Without
spin-orbit coupling, for... | 1512.03450v2 |
2015-12-18 | Seismic waves damping with arrays of inertial resonators | We investigate the elastic stop band properties of a theoretical cubic array
of iron spheres connected to a bulk of concrete via iron or rubber ligaments.
Each sphere can move freely within a surrounding air cavity, but ligaments
couple it to the bulk and further facilitate bending and rotational motions.
Associated lo... | 1512.06078v2 |
2016-04-13 | Magnetic properties and pairing tendencies of the iron-based superconducting ladder BaFe$_2$S$_3$: combined ab initio and density matrix renormalization group study | The recent discovery of superconductivity under high pressure in the two-leg
ladder compound BaFe$_2$S$_3$ [H. Takahashi et al., Nature Materials 14, 1008
(2015)] opens a broad avenue of research, because it represents the first
report of pairing tendencies in a quasi one-dimensional iron-based high
critical temperatur... | 1604.03621v2 |
2016-05-10 | A unified model of grain alignment: radiative alignment of interstellar grains with magnetic inclusions | The radiative torque (RAT) alignment of interstellar grains with ordinary
paramagnetic susceptibilities has been supported by earlier studies. The
alignment of such grains depends on the so-called RAT parameter $q^{\max}$ that
is determined by the grain shape. In this paper, we elaborate our model of RAT
alignment for ... | 1605.02828v2 |
2016-06-08 | Observation of a Hidden Hole-Like Band Approaching the Fermi Level in K-Doped Iron Selenide Superconductor | One of the ultimate goals of the study of iron-based superconductors is to
identify the common feature that produces the high critical temperature (Tc).
In the early days, based on a weak-coupling viewpoint, the nesting between
hole- and electron-like Fermi surfaces (FSs) leading to the so-called $s\pm$
state was consi... | 1606.02405v1 |
2016-06-27 | Coordinated Analysis of Two Graphite Grains from the CO3.0 LAP 031117 Meteorite: First Identification of a CO Nova Graphite and a Presolar Iron Sulfide Subgrain | Presolar grains constitute remnants of stars that existed before the
formation of the solar system. In addition to providing direct information on
the materials from which the solar system formed, these grains provide
ground-truth information for models of stellar evolution and nucleosynthesis.
Here we report the in-si... | 1606.08310v1 |
2016-07-05 | Delayed hepatic uptake of multi-phosphonic acid poly(ethylene glycol) coated iron oxide measured by real-time Magnetic Resonance Imaging | We report on the synthesis, characterization, stability and pharmacokinetics
of novel iron based contrast agents for magnetic resonance imaging (MRI).
Statistical copolymers combining multiple phosphonic acid groups and
poly(ethylene glycol) (PEG) were synthesized and used as coating agents for 10
nm iron oxide nanocry... | 1607.01656v1 |
2016-07-11 | A quasi-periodic modulation of the iron line centroid energy in the black hole binary H 1743-322 | Accreting stellar-mass black holes often show a `Type-C' quasi-periodic
oscillation (QPO) in their X-ray flux, and an iron emission line in their X-ray
spectrum. The iron line is generated through continuum photons reflecting off
the accretion disk, and its shape is distorted by relativistic motion of the
orbiting plas... | 1607.02866v1 |
2016-12-20 | Magnetism of PrFeAsO parent compound for iron-based superconductors: Mössbauer spectroscopy study | Moessbauer spectroscopy measurements were performed for the temperature range
between 4.2 K and 300 K in a transmission geometry applying 14.41-keV resonant
line in 57Fe for PrFeAsO the latter being a parent compound of the iron-based
superconductors belonging to the '1111' family. It was found that an itinerant
3d mag... | 1612.06776v3 |
2017-04-06 | Towards Picogram Detection of Superparamagnetic Iron-Oxide Particles Using a Gradiometric Receive Coil | Superparamagnetic iron-oxide nanoparticles can be used in a variety of
medical applications like vascular or targeted imaging. Magnetic particle
imaging (MPI) is a promising tomographic imaging technique that allows
visualizing the 3D nanoparticle distribution concentration in a non-invasive
manner. The two main streng... | 1704.01789v2 |
2017-07-10 | Diagnosing the kinematics of the tori in active galactic nuclei with the velocity-resolved reverberation mapping of the narrow iron K$α$ line | The properties of the dusty tori in active galactic nuclei (AGNs) have been
investigated in detail, mainly focusing on the geometry and components;
however, the kinematics of the torus is still not clear. The narrow iron
K$\alpha$ line at 6.4 keV is thought to be produced by the X-ray reflection
from the torus. Thus, t... | 1707.02665v1 |
2017-08-15 | Effects of ultrasound waves intensity on the removal of Congo red color from the textile industry wastewater by Fe3O4@TiO2 core-shell nanospheres | Environmental pollutants, such as colors from the textile industry, affect
water quality indicators like color, smell, and taste. These substances in the
water cause the obstruction of filters and membranes and thereby reduce the
efficiency of advanced water treatment processes. In addition, they are harmful
to human h... | 1708.04683v2 |
2017-09-21 | Orbital loop currents in iron-based superconductors | We show that the antiferromagnetic state commonly observed in the phase
diagrams of the iron-based superconductors necessarily triggers loop currents
characterized by charge transfer between different Fe $ 3d $ orbitals. This
effect is rooted on the glide-plane symmetry of these materials and on the
existence of an ato... | 1709.07266v2 |
2017-10-13 | A Suzaku View of Accretion Powered X-ray Pulsar GX 1+4 | We present results obtained from a Suzaku observation of the accretion
powered X-ray pulsar GX 1+4. Broad-band continuum spectrum of the pulsar was
found to be better described by a simple model consisting of a blackbody
component and an exponential cutoff power-law than the previously used compTT
continuum model. Thou... | 1710.04820v2 |
2017-12-13 | Quantum effects on dislocation motion from Ring-Polymer Molecular Dynamics | Quantum motion of atoms known as zero-point vibrations is recognized to be
important at low temperatures in condensed matter systems comprised of light
atoms or ions, affecting such properties and behaviors as proton-transfer
reactions, vibrational spectra of water and ice, and mechanical properties of
low temperature ... | 1712.04629v2 |
2017-12-19 | Cysteine and cystine adsorption on FeS$_{2}$(100) | Iron pyrite (FeS$_{2}$) is the most abundant metal sulfide on Earth. Owing to
its reactivity and catalytic activity, pyrite has been studied in various
research fields such as surface science, geochemistry, and prebiotic chemistry.
Importantly, native iron-sulfur clusters are typically coordinated by cysteinyl
ligands ... | 1712.06785v1 |
2018-01-18 | Iron-peak elements Sc, V, Mn, Cu and Zn in Galactic bulge globular clusters | Globular clusters are tracers of the history of star formation and chemical
enrichment in the early Galaxy. Their abundance pattern can help understanding
their chemical enrichment processes. In particular, the iron-peak elements have
been relatively little studied so far in the Galactic bulge. The abundances of
iron-p... | 1801.06157v1 |
2018-02-17 | J0023+0307: A mega metal-poor dwarf star from SDSS/BOSS | Only a handful of stars have been identified with an iron abundance
[Fe/H]<-5, and only one at [Fe/H]<-7. These stars have very large
carbon-to-iron ratios, with A(C)~7.0, most likely due to fallback in
core-collapse supernovae, which makes their total metallicity Z much higher
than their iron abundances. The failure t... | 1802.06240v2 |
2018-03-26 | The chemical composition of NGC5824, a globular cluster without iron spread but with an extreme Mg-Al anticorrelation | NGC5824 is a massive Galactic globular cluster suspected to have an intrinsic
spread in its iron content, according to the strength of the calcium triplet
lines. We present chemical abundances of 117 cluster giant stars using
high-resolution spectra acquired with the multi-object spectrograph FLAMES. The
metallicity di... | 1803.09759v1 |
2018-04-30 | X-ray short-time lags in the Fe-K energy band produced by scattering clouds in active galactic nuclei | X-rays illuminating the accretion disc in active galactic nuclei give rise to
an iron K line and its associated reflection spectrum which are lagged behind
the continuum variability by the light-travel time from the source to the disc.
The measured lag timescales in the iron band can be as short as $\sim R_g/c$,
where ... | 1805.00046v1 |
2018-07-16 | Revisiting the iron abundance in the hyper iron-poor star HE$~$1327-2326 with UV COS/$HST$ data | We present a new iron abundance analysis of the hyper metal-poor star
HE$~$1327-2326, based on Fe II lines detected in its UV spectral range for the
first time. In a Cosmic Origins Spectrograph (COS) spectrum, five new Fe II
lines could be measured. A Si I line was also detected for the first time. We
determine a 1D Lo... | 1807.06153v1 |
2019-02-13 | Strain Controlling Catalytic Efficiency of Water Oxidation for Ni1-xFexOOH alloy | A catalyst surface may be exposed to strain due to application of load or
interfacing with a substrate with large lattice mismatch. In order to test the
effect of strain on catalytic efficiency, we use Density Functional Theory +U
(DFT+U) to model water oxidation on expanded and contracted surfaces of the
Ni1-xFexOOH a... | 1902.04788v1 |
2019-03-27 | Design, Fabrication and Characterization of FeAl-based Metallic-Intermetallic Laminate (MIL) Composites | FeAl-based MIL composites of various iron alloys were fabricated with an
innovative 'multiple-thin-foil' configuration and 'two-stage reaction'
strategy. | 1903.11724v1 |
2019-04-02 | The Wolf-Rayet Stellar Response To The Iron Opacity Bump: Envelope Inflation, Winds, and Microturbulence | Early-type Wolf-Rayet(WR) stellar models harbor a super-Eddington layer in
their outer envelopes due to a prominent iron opacity bump. In the past few
decades, one-dimensional hydrostatic and time-steady hydrodynamic models have
suggested a variety of WR responses to a super-Eddington force including
envelope inflation... | 1904.01703v1 |
2019-04-30 | Scalable Majorana vortex modes in iron-based superconductors | A vortex in an s-wave superconductor with a surface Dirac cone can trap a
Majorana bound state with zero energy leading to a zero-bias peak (ZBP) of
tunneling conductance. The iron-based superconductor FeTe$_x$Se$_{1-x}$ is one
of the material candidates hosting these Majorana vortex modes. It has been
observed by rece... | 1904.13374v3 |
2019-06-18 | X-ray reprocessing: Through the eclipse spectra of high mass X-ray binaries with XMM-Newton | The study of X-ray reprocessing is one of the key diagnostic tools to probe
the environment in X-ray binary systems. One difficult aspect of studying X-ray
reprocessing is the presence of much brighter primary radiation from the
compact star together with the reprocessed radiation. In contrast for eclipsing
systems, th... | 1906.07739v1 |
2019-11-13 | Superparamagnetic iron oxide nanoparticles conjugated with doxorubicin for targeting breast cancer | Development of the next generations of cancer therapy modalities is currently
a crucial requirement of oncology. Advances in nanotechnology are bringing us
closer to the development of dual and multifunctional nanoparticles that are
challenging the traditional distinction between diagnostic and treatment
agents. The ch... | 1911.05378v1 |
2020-03-06 | Mössbauer parameters of $^{57}$Fe substituents in the topological insulator $Bi_2Se_3$ | $^{57}$Fe M\"ossbauer spectroscopy can probe several \emph{local} structural,
electronic and magnetic properties of Fe-containing systems. However, to
establish a direct relationship between these properties and a system's
geometric structure, the experimental M\"ossbauer parameters need to be
analyzed \emph{via} elect... | 2003.03458v1 |
2020-04-01 | Phase transitions and spin-state of iron in FeO at the conditions of Earth's deep interior | Iron-bearing oxides undergo a series of pressure-induced electronic, spin and
structural transitions that can cause seismic anomalies and dynamic
instabilities in Earth's mantle and outer core. We employ x-ray diffraction and
x-ray emission spectroscopy along with state-of-the-art density functional plus
dynamical mean... | 2004.00652v2 |
2020-06-05 | Planetary mass-radius relations across the galaxy | Planet formation theory suggests that planet bulk compositions are likely to
reflect the chemical abundance ratios of their host star's photosphere.
Variations in the abundance of particular chemical species in stellar
photospheres between different galactic stellar populations demonstrate that
there are differences am... | 2006.03601v2 |
2020-10-01 | Near L-Edge Single and Multiple Photoionization of Doubly Charged Iron Ions | Using the photon-ion merged-beams technique at a synchrotron light source, we
have measured relative cross sections for single and up to five-fold
photoionization of Fe$^{2+}$ ions in the energy range 690--920 eV. This range
contains thresholds and resonances associated with ionization and excitation of
$2p$ and $2s$ e... | 2010.00473v1 |
2020-10-13 | Chemical Fingerprints of Formation in Rocky Super-Earths' Data | The composition of rocky exoplanets in the context of stars' composition
provides important constraints to formation theories. In this study, we select
a sample of exoplanets with mass and radius measurements with an uncertainty
<25% and obtain their interior structure. We calculate compositional markers,
ratios of iro... | 2010.06480v1 |
2020-11-16 | Role of anion in the pairing interaction of iron-based superconductivity | High-temperature iron-based superconductivity develops in a structure with
unusual lattice-orbital geometry, based on a planar layer of Fe atoms with 3d
orbitals and tetrahedrally coordinated by anions. Here we elucidate the
electronic role of anions in the iron-based superconductors utilizing
state-of-the-art scanning... | 2011.07701v1 |
2020-11-26 | Oxidising and carburising catalyst conditioning for the controlled growth and transfer of large crystal monolayer hexagonal boron nitride | Hexagonal boron nitride (h-BN) is well-established as a requisite support,
encapsulant and barrier for 2D material technologies, but also recently as an
active material for applications ranging from hyperbolic metasurfaces to room
temperature single-photon sources. Cost-effective, scalable and high quality
growth techn... | 2011.13176v1 |
2020-12-23 | Hot electron relaxation in normal state of iron pnictides: memory function approach | This study leads to the investigation of the non-equilibrium electron
relaxation in the normal state of iron pnictides. Here we consider the
relaxation of electrons due to their coupling with magnons and phonons in the
metallic state of iron pnictides using the memory function approach. In the
present model, electrons ... | 2012.12650v1 |
2021-02-10 | Influence of microstructure and atomic-scale chemistry on iron ore reduction with hydrogen at 700°C | With 1.85 billion tons produced per year, steel is the most important
material class in terms of volume and environmental impact. While steel is a
sustainability enabler, for instance through lightweight design, magnetic
devices, and efficient turbines, its primary production is not. For 3000 years,
iron has been reduc... | 2102.05654v1 |
2021-04-06 | Early volatile depletion on planetesimals inferred from C-S systematics of iron meteorite parent bodies | During the formation of terrestrial planets, volatile loss may occur through
nebular processing, planetesimal differentiation, and planetary accretion. We
investigate iron meteorites as an archive of volatile loss during planetesimal
processing. The carbon contents of the parent bodies of magmatic iron
meteorites are r... | 2104.02706v1 |
2021-05-15 | Two-step nucleation of the Earth's inner core | It has long been assumed the Earth's solid inner core started to grow when
molten iron cooled to its melting point. However, the nucleation mechanism,
which is a necessary step of crystallization, has not been well understood.
Recent studies found it requires an unrealistic degree of undercooling to
nucleate the stable... | 2105.07296v2 |
2021-06-04 | Disentangling Dense Multi-Cable Knots | Disentangling two or more cables requires many steps to remove crossings
between and within cables. We formalize the problem of disentangling multiple
cables and present an algorithm, Iterative Reduction Of Non-planar Multiple
cAble kNots (IRON-MAN), that outputs robot actions to remove crossings from
multi-cable knott... | 2106.02252v1 |
2021-09-17 | Quantum hardware calculations of periodic systems with partition-measurement symmetry verification: simplified models of hydrogen chain and iron crystals | Running quantum algorithms on real hardware is essential for understanding
their strengths and limitations, especially in the noisy intermediate scale
quantum (NISQ) era. Herein we focus on the practical aspect of quantum
computational calculations of solid-state crystalline materials based on theory
developed in our g... | 2109.08401v4 |
2021-09-23 | Large Exotic Spin Torques in Antiferromagnetic Iron Rhodium | Spin torque is a promising tool for driving magnetization dynamics for novel
computing technologies. These torques can be easily produced by spin-orbit
effects, but for most conventional spin source materials, a high degree of
crystal symmetry limits the geometry of the spin torques produced. Magnetic
ordering is one w... | 2109.11108v1 |
2021-12-29 | Composition of super-Earths, super-Mercuries, and their host stars | Because of their common origin, it was assumed that the composition of planet
building blocks should, to a first order, correlate with stellar atmospheric
composition, especially for refractory elements. In fact, information on the
relative abundance of refractory and major rock-forming elements such as Fe,
Mg, Si has ... | 2112.14512v1 |
2022-01-06 | Ironing out the details of unconventional superconductivity | Superconductivity is a remarkably widespread phenomenon observed in most
metals cooled down to very low temperatures. The ubiquity of such conventional
superconductors, and the wide range of associated critical temperatures, is
readily understood in terms of the celebrated Bardeen-Cooper-Schrieffer (BCS)
theory. Occasi... | 2201.02095v1 |
2022-03-21 | White Dwarf Photospheric Abundances in Cataclysmic Variables -- II. White Dwarfs With and Without a Mask | Taking advantage of the now available Gaia EDR3 parallaxes, we carry out an
archival {\it Hubble Space Telescope} (HST) far ultraviolet spectroscopic
analysis of 10 cataclysmic variable systems, including 5 carefully selected
eclipsing systems. We obtain accurate white dwarf (WD) masses and temperatures,
in excellent a... | 2203.11020v1 |
2022-04-11 | Forming Iron-rich Planets with Giant Impacts | We investigate mantle stripping giant impacts (GI) between super-Earths with
masses between 1 M$_{\oplus}$ and 20 M$_{\oplus}$. We infer new scaling laws
for the mass of the largest fragment and its iron mass fraction, as well as
updated fitting coefficients for the critical specific impact energy for
catastrophic disr... | 2204.04925v3 |
2023-01-11 | Evolution of the spin dynamics during freezing in the spin-glass Fe$_{x}$Cr$_{1-x}$ | In the iron--chromium system, Fe$_{x}$Cr$_{1-x}$, a wide dome of spin-glass
behavior emerges when the ferromagnetism of iron is suppressed and the
antiferromagnetism of chromium emerges as a function of increasing iron content
$x$. As both, the high-temperature state and the characteristic cluster size
vary as a functi... | 2301.04495v1 |
2023-03-12 | Competing Magnetic Interactions and Field-Induced Metamagnetic Transition in Highly Crystalline Phase-Tunable Iron Oxide Nanorods | The inherent existence of multi phases in iron oxide nanostructures
highlights the significance of them being investigated deliberately to
understand and possibly control the phases. Here, the effects of annealing at
250 0C with a variable duration on the bulk magnetic and structural properties
of high aspect ratio bi-... | 2303.06684v1 |
2023-03-24 | Early phases of the Galaxy from the chemical imprint on the iron-poor stars J0815+4729 and J0023+0307 | We have been exploring large spectroscopic databases such as SDSS to search
for unique stars with extremely low iron content with the goal of extracting
detailed information from the early phases of the Galaxy. We recently
identified two extremely iron-poor dwarf stars J0815+4729 (Aguado et al. 2018a)
and J0023+0307 (A... | 2303.14142v1 |
2023-10-27 | Emergent spin-glass state in the doped Hund's metal CsFe2As2 | Hund's metal is one kind of correlated metal, in which the electronic
correlation is strongly influenced by the Hund's interaction. At high
temperatures, while the charge and orbital degrees of freedom are quenched, the
spin degrees of freedom can persist in terms of frozen moments. As temperature
decreases, a coherent... | 2310.17858v1 |
2023-11-07 | Direct reduction of iron-ore with hydrogen in fluidized beds: A coarse-grained CFD-DEM-IBM study | Hydrogen metallurgy technology uses hydrogen as the reducing agent instead of
carbon reduction, which is one of the important ways to reduce carbon dioxide
emissions and ensure the green and sustainable development of iron and steel
industry. Due to the advantages of high gas-solid contact efficiency and
outstanding ma... | 2311.03908v1 |
2023-12-22 | Broken inversion symmetry in van der Waals topological ferromagnetic metal iron germanium telluride | Inversion symmetry breaking is critical for many quantum effects and
fundamental for spin-orbit torque, which is crucial for next-generation
spintronics. Recently, a novel type of gigantic intrinsic spin-orbit torque has
been established in the topological van-der-Waals (vdW) magnet iron germanium
telluride. However, i... | 2312.14384v1 |
2024-01-05 | The Fate of Primary Iron Sulfides in the CM1 Carbonaceous Chondrites: Effects of Advanced Aqueous Alteration on Primary Components | We have carried out a SEM-EPMA-TEM study to determine the textures and
compositions of relict primary iron sulfides and their alteration products in a
suite of moderately to heavily-altered CM1 carbonaceous chondrites. We observed
four textural groups of altered primary iron sulfides: 1)
pentlandite+phyllosilicate (2P)... | 2401.02932v1 |
2024-02-19 | Breaks in the Hall-Petch Relationship after Severe Plastic Deformation of Magnesium, Aluminum, Copper, and Iron | Strengthening by grain refinement via the Hall-Petch mechanism and softening
by nanograin formation via the inverse Hall-Petch mechanism have been the
subject of argument for decades, particularly for ultrafine-grained materials.
In this study, the Hall-Petch relationship is examined for ultrafine-grained
magnesium, al... | 2402.11798v1 |
2024-02-19 | Ironing allocations | I propose a new approach to solving standard screening problems when the
monotonicity constraint binds. A simple geometric argument shows that when
virtual values are quasi-concave, the optimal allocation can be found by
appropriately truncating the solution to the relaxed problem. I provide a
simple algorithm for find... | 2402.11881v1 |
1994-01-24 | The Contribution of the Obscuring Torus to the X--Ray Spectrum of Seyfert Galaxies: A Test for the Unification Model | The presence of an obscuring torus around the nucleus of Seyfert galaxies, as
supposed in the popular unification scheme, can strongly modify the X--ray
spectrum for both type 1 and 2 Seyfert galaxies. We find that if the torus is
Compton thick, it can scatter at small angles a significant fraction of the
nuclear radia... | 9401044v1 |
1996-08-26 | Variability of the iron K-emission line in the Seyfert 1 galaxy NGC 3516 | We present strong evidence for variability of the flux of the iron K$\alpha$
emission line in the Seyfert 1 galaxy, NGC 3516. Two ASCA observations,
separated by $\sim 1$~yr, showed a marked decrease in continuum flux by $\sim
60$~per cent. The flux in the broad, iron K$\alpha$ line decreased by the same
factor in this... | 9608171v1 |
1997-03-25 | The iron K line complex in NGC1068: implications for X-ray reflection in the nucleus | We report a new analysis of ASCA data on the iron K line complex in NGC1068.
The line complex basically consists of three components, as previously
reported. A weak red wing of the 6.4 keV fluoresence iron K line is found. A
plausible explanation is Compton scattering in optically thick, cold matter
which can be identi... | 9703159v1 |
1997-07-07 | Special relativistic effects on the strength of the fluorescent K-alpha iron line from black hole accretion disks | The broad iron K$\alpha$ emission line, commonly seen in the X-ray spectrum
of Seyfert nuclei, is thought to originate when the inner accretion disk is
illuminated by an active disk-corona. We show that relative motion between the
disk and the X-ray emitting material can have an important influence on the
observed equi... | 9707082v1 |
1998-02-05 | How Abundant is Iron in the Core of the Perseus Cluster? | The analysis of Perseus data collected with the Medium Energy Concentrator
Spectrometer (MECS) on board Beppo-SAX shows that the ratio of the flux of the
8 keV line complex (dominated by Fe K$_{\beta}$ emission) over the 6.8 keV line
complex (dominated by Fe K$_{\alpha}$ emission) is significantly larger than
predicted... | 9802067v1 |
1999-02-18 | The contribution of AGN to the X-ray background: the effect of iron features | The contribution of the iron emission line, commonly detected in the X-ray
spectra of Seyfert (Sey) galaxies, to the cosmic X-ray background (XRB)
spectrum is evaluated in the framework of the XRB synthesis models based on AGN
unification schemes. To derive the mean line properties, we have carried out a
search in the ... | 9902256v1 |
1999-06-21 | Galactic Ultra-High-Energy Cosmic Rays | The absence of the expected GZK cutoff strongly challenges the notion that
the highest-energy cosmic rays are of distant extragalactic origin. We discuss
the possibility that these ultra-high-energy events originate in our Galaxy and
propose that they may be due to iron nuclei accelerated from young, strongly
magnetic ... | 9906338v1 |
1999-08-25 | Reprocessed emission from warped accretion discs with application to X-ray iron line profiles | Flourescent iron line profiles currently provide the best diagnostic for
active galactic nuclei (AGN) engine geometries. Here we construct a method for
calculating the relativistic iron line profile from an arbitrarily warped
accretion disc, illuminated from above and below by hard X-ray sources. This
substantially gen... | 9908275v1 |
1999-11-19 | Revised Stroemgren metallicity calibration for red giants | A new calibration of the Stroemgren (b-y),m_1 diagram in terms of iron
abundance of red giants is presented. This calibration is based on a
homogeneous sample of giants in the globular clusters omega Centauri, M22, and
M55 as well as field giants from the list of Anthony-Twarog & Twarog (1998).
Towards high metalliciti... | 9911387v1 |
1999-12-01 | Line emission from gamma-ray burst environments | The time and angle dependent line and continuum emission from a dense torus
around a cosmological gamma-ray burst source is simulated, taking into account
photoionization, collisional ionization, recombination, and electron heating
and cooling due to various processes. The importance of the hydrodynamical
interaction b... | 9912030v2 |
1999-12-10 | Ultra-High Energy Cosmic Rays from Young Neutron Star Winds | The long-held notion that the highest-energy cosmic rays are of distant
extragalactic origin is challenged by observations that events above $\sim
10^{20}$ eV do not exhibit the expected high-energy cutoff from photopion
production off the cosmic microwave background. We suggest that these
unexpected ultra-high-energy ... | 9912240v2 |
2000-01-19 | Observing the effects of strong gravity with future X-ray missions | Spectroscopy of the broad iron iron with ASCA and BeppoSAX has up opened the
innermost regions of accreting black hole systems to detailed study. In this
contribution, I discuss how observations with future X-ray missions will extend
these studies and all us to observationally address issues which are currently
only in... | 0001324v1 |
2000-10-11 | Discovery of a redshifted Iron K-line in the X-ray afterglow of GRB 000214 | We report the detection (3 sigma significance level) of a strong iron
emission line in the X-ray spectrum of the afterglow of GRB 000214
(``Valentine's Day Burst'') observed by BeppoSAX. An emission line feature was
observed with a centroid energy of 4.7+/-0.2 keV which, if interpreted as
K-alpha emission from hydrogen... | 0010221v1 |
2000-10-20 | First XMM-Newton observations of a cataclysmic variable II: the X-ray spectrum of OY Car | We present XMM-Newton X-ray spectra of the disc accreting cataclysmic
variable OY Car, which were obtained during the performance verification phase
of the mission. These data were taken 4 days after a short outburst. In the
EPIC spectra we find strong iron Kalpha emission with weaker iron Kbeta
emission together with ... | 0010416v1 |
2000-10-20 | XMM-Newton observations of the cluster of galaxies Sersic 159-03 | The cluster of galaxies Sersic 159-03 was observed with the XMM-Newton X-ray
observatory as part of the Guaranteed Time program. X-ray spectra taken with
the EPIC and RGS instruments show no evidence for the strong cooling flow
derived from previous X-ray observations. There is a significant lack of cool
gas below 1.5 ... | 0010423v2 |
2000-10-25 | The unique rapid variabilities of the iron K$α$ line profiles in NGC 4151 | We present a detailed analysis of the iron K$\alpha$ line variabilities in
NGC 4151 by using long ASCA observation data obtained in May 1995. Despite the
relatively small amplitude variations in the continuum flux, the iron K$\alpha$
line flux and profile show dramatic variations. Particularly, the line profile
changes... | 0010524v1 |
2000-11-28 | Stellar Pollution in the Solar Neighborhood | We study spectroscopically determined iron abundances of 642 solar-type stars
to search for the signature of accreted iron-rich material. We find that the
metallicity [Fe/H] of a subset of 466 main sequence stars, when plotted as a
function of stellar mass, mimics the pattern seen in lithium abundances in open
clusters... | 0011530v1 |
2001-03-23 | A Measurement of the Flux of Cosmic Ray Iron at 5 x 10^13 eV | We present results from the initial flight of our Balloon Air CHerenkov
(BACH) payload. BACH detects air Cherenkov radiation from cosmic ray nuclei as
coincident flashes in two optical modules. The flight (dubbed PDQ BACH) took
place on April 22, 1998 from Ft. Sumner, New Mexico. During an exposure of 2.75
hours, with ... | 0103397v1 |
2001-07-18 | Non-Equilibrium Ionization States of GRB Environments | Iron spectral features are thought to be the best tracer of a progenitor of
gamma-ray bursts (GRBs). The detections of spectral features such as an iron
line and/or a Radiative Recombination edge and Continuum (RRC) were reported in
four X-ray afterglows of GRBs. However their properties were different each
other burst... | 0107330v1 |
2001-09-13 | High Redshift Quasars and Star Formation in the Early Universe | In order to derive information on the star formation history in the early
universe we observed 6 high-redshift (z=3.4) quasars in the near-infrared to
measure the relative iron and \mgii emission strengths. A detailed comparison
of the resulting spectra with those of low-redshift quasars show essentially
the same FeII/... | 0109208v1 |
2002-03-29 | The shape of the relativistic iron K-alpha line from MCG6--6-30-15 measured with the Chandra HETGS and RXTE | We confirm the detection of the relativistically broadened iron K-alpha
emission at 6.4 keV with simultaneous Chandra HETGS and RXTE PCA observations.
Heavily binned HETGS data show a disk line profile with parameters very similar
to those previously seen by ASCA. We observe a resolved narrow component with a
velocity ... | 0203523v2 |
2002-06-07 | X-ray spectral diagnostics of the immediate environment of GRB 991216 | The recent report of iron line features in the afterglow of the gamma-ray
burst (GRB) 991216 has important implications for the properties of the
radiating material and hence the nature of the immediate burst environment. We
argue that the putative strong Fe emission line can be attributed to the
reflected emission fro... | 0206116v1 |
2002-07-08 | Sulphur and iron abundances in halo stars | From equivalent widths of the SI lines at 8694 A, Israelian & Rebolo (2001)
and Takada-Hidai et al. (2002) have derived a surprisingly high sulphur-to-iron
ratio ([S/Fe] = 0.5 to 0.7) in six halo stars with [Fe/H] ~ -2.0 suggesting
perhaps that hypernovae made a significant contribution to the formation of
elements in ... | 0207163v1 |
2002-07-29 | The iron Kalpha Compton Shoulder in transmitted and reflected spectra | We calculate the Equivalent Widht of the Core and the centroid energy and
relative flux of the 1st order Compton Shoulder of the iron Kalpha emission
line from neutral matter. The calculations are performed with Monte Carlo
simulations. We explore a large range of column densities for both transmitted
and reflected spe... | 0207615v1 |
2003-01-03 | Implementing TOPbase/Iron Project: Continuous Absorption from Fe II | We discuss implementation of TOPbase and Iron Project opacities for stellar
spectral codes. We use a technique employed by Peach, where a
Boltzmann-averaged cross section is calculated for selected temperatures, and
the opacity obtained from double interpolation in temperature and wavelength.
It is straightforward to i... | 0301045v1 |
2003-01-14 | Relics of subluminous supernovae in metal-poor stars | The unique elemental abundance pattern of the carbon-rich stars CS29498-043
and CS22949-037 is characterized by a large excess of magnesium and silicon in
comparison with iron. This excess is investigated in the context of a
supernova-induced star formation scenario, and it is concluded that these stars
were born from ... | 0301236v1 |
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