publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2020-05-13 | Neutron spin resonance in a quasi-two-dimensional iron-based superconductor | Magnetically mediated Cooper pairing is generally regarded as a key to
establish the unified mechanism of unconventional superconductivity. One
crucial evidence is the neutron spin resonance arising in the superconducting
state, which is commonly interpreted as a spin-exciton from collective
particle-hole excitations c... | 2005.06146v1 |
2020-05-19 | Speciation of FeS and FeS$_2$ by means of X-ray Emission Spectroscopy using a compact full-cylinder von Hamos spectrometer | We present Fe K$\beta$ X-ray emission (XES) and Fe K X-ray absorption spectra
(XAS) of Iron(II)sulfide (FeS) and Iron(II)disulfide (FeS$_2$). While XES and
XAS offer different discrimination capabilities for chemical speciation,
depending on the valence states of the compounds probed, XES allows for using
different exc... | 2005.09509v1 |
2020-05-19 | Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions | Iron-based superconductors are well-known for their intriguing phase
diagrams, which manifest a complex interplay of electronic, magnetic and
structural degrees of freedom. Among the phase transitions observed are
superconducting, magnetic, and several types of structural transitions,
including a tetragonal-to-orthorho... | 2005.09791v1 |
2020-06-29 | Nematic Fluctuations in an Orbital Selective Superconductor Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ | We present a systematic study of the nematic fluctuations in the iron
chalcogenide superconductor Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ ($0 \leq x \leq 0.53$)
using the elastoresistivity technique. Near $x = 0$, in proximity to the
double-stripe magnetic order of Fe$_{1+y}$Te, a diverging $B_{1g}$ nematic
susceptibility is obse... | 2006.15887v1 |
2020-07-19 | Anomalous spectral weight transfer in the nematic state of iron-selenide superconductor | Nematic phase intertwines closely with high-Tc superconductivity in
iron-based superconductors. Its mechanism, which is closely related to the
pairing mechanism of superconductivity, still remains controversial.
Comprehensive characterization of how the electronic state reconstructs in the
nematic phase is thus crucial... | 2007.09565v1 |
2020-07-20 | Vortex-line topology in iron-based superconductors with and without second-order topology | The band topology of a superconductor is known to have profound impact on the
existence of Majorana zero modes in vortices. As iron-based superconductors
with band inversion and $s_{\pm}$-wave pairing can give rise to time-reversal
invariant second-order topological superconductivity, manifested by the
presence of heli... | 2007.10326v4 |
2020-08-05 | Black Dwarf Supernova in the Far Future | In the far future long after star formation has ceased the universe will be
populated by sparse degenerate remnants, mostly white dwarfs, though their
ultimate fate is an open question. These white dwarfs will cool and freeze
solid into black dwarfs while pycnonuclear fusion will slowly process their
composition to iro... | 2008.02296v1 |
2020-08-18 | Returning radiation in strong gravity around black holes: Reverberation from the accretion disc | We study reflected X-ray emission that returns to the accretion disc in the
strong gravitational fields around black holes using General Relativistic ray
tracing and radiative transfer calculations. Reflected X-rays that are produced
when the inner regions of the disc are illuminated by the corona are subject to
strong... | 2008.08083v1 |
2021-02-09 | Reinforcing Iron Metal Matrix Composite by Multi-Wall Carbon Nanotube: A Combined Theoretical and Computational Approach | Carbon nanotube (CNT) reinforced metal matrix composites have been the focus
of researchers due to their high load-bearing capacity. Among single and
multi-wall carbon nanotubes (MWCNT), the latter is preferred by manufacturers
and engineers for making composites due to their economic feasibility of
synthesizing. Howev... | 2102.05025v1 |
2021-04-07 | Fundamental mechanism of the creation of chemical bimodality in the Milky Way disc in the cold accretion theory | Chemical bimodality of the Milky Way (MW) disc stars constitutes one of the
most remarkable properties of MW. The cold accretion theory for the
cosmological gas accretion provides one viable explanation to this phenomenon.
In this scenario, the rapid cold-mode accretion in the early epoch creates the
first generation s... | 2104.02976v1 |
2021-05-10 | Quantum magnetism of iron-based ladders: Blocks, spirals, and spin flux | Motivated by increasing experimental evidence of exotic magnetism in
low-dimensional iron-based materials, we present a comprehensive theoretical
analysis of magnetic states of the multiorbital Hubbard ladder in the
orbital-selective Mott phase (OSMP). The model we used is relevant for
iron-based compounds of the AFe$_... | 2105.04391v2 |
2021-05-14 | Spectral and timing properties of the black hole candidate X1755-338 observed in 1989-1995 | We report results of an analysis of the black hole (BH) candidate source
X1755-338 in 1989, 1990, and 1991 with Ginga, and in 1995 with ASCA. The
spectra were well represented by a model consisting of a soft thermal emission
from an accretion disk and a hard X-ray tail. The normalization of the
multi-color disk model, ... | 2105.06628v1 |
2021-05-20 | The Abundance of Lead in Four Metal-Poor Stars | Cowan et al. (2021) review how roughly half the elements heavier than iron
found in the Sun are produced by rapid neutron capture and half by slow neutron
capture, the r- and s-processes. In the Sun, their relative contribution to
individual elemental abundances is well understood, except for the lightest and
heaviest ... | 2105.09456v1 |
2021-07-07 | Correlations of r-Process Elements in Very Metal-Poor Stars as Clues to their Nucleosynthesis Sites | Various nucleosynthesis studies have pointed out that the r-process elements
in very metal-poor (VMP) halo stars might have different origins. By means of
familiar concepts from statistics (correlations, cluster analysis, rank tests
of elemental abundances), we look for causally correlated elemental abundance
patterns ... | 2107.03486v1 |
2021-07-08 | Magnetic properties of 3d, 4d, and 5d transition-metal atomic monolayers in Fe/TM/Fe sandwiches: Systematic first-principles study | Previous studies have accurately determined the effect of transition metal
point defects on the properties of bcc iron. The magnetic properties of
transition metal monolayers on the iron surfaces have been studied equally
intensively. In this work, we investigated the magnetic properties of the 3d,
4d, and 5d transitio... | 2107.03768v1 |
2021-07-09 | Three-Dimensional Hydrodynamic Simulations of Convective Nuclear Burning In Massive Stars Near Iron Core Collapse | Non-spherical structure in massive stars at the point of iron core collapse
can have a qualitative impact on the properties of the ensuing core-collapse
supernova explosions and the multi-messenger signals they produce. Strong
perturbations can aid successful explosions by strengthening turbulence in the
post-shock reg... | 2107.04617v1 |
2021-08-10 | Site-selective magnetic moment collapse in compressed Fe5O6 | Iron oxide is one of the most important components in Earth's mantle. Recent
discovery of the stable presence of Fe5O6 at Earth's mantle environment
stimulates significant interests in the understanding of this new category of
iron oxides. In this paper, we report the electronic structure and magnetic
properties of Fe5... | 2108.04473v1 |
2021-09-08 | A new set of chisels for Galactic archaeology: Sc, V and Zn as taggers of accreted globular clusters | Chemical tagging is a powerful tool to reveal the origin of stars and
globular clusters (GCs), especially when dynamics alone cannot provide robust
answers. So far, mostly $\alpha$- and neutron capture elements have been used
to distinguish stars born in the Milky Way (MW) from those born in external
environments such ... | 2109.03837v1 |
2021-09-22 | Coupling between Antiferromagnetic and Spin Glass Orders in the Quasi-One-Dimensional Iron Telluride TaFe$_{1+x}$Te$_3$ ($x$=0.25) | Understanding the interplay among different magnetic exchange interactions
and its physical consequences, especially in the presence of itinerant
electrons and disorders, remains one of the central themes in condensed matter
physics. In this vein, the coupling between antiferromagnetic and spin glass
orders may lead to... | 2109.10740v1 |
2021-09-22 | Intermediate spin state and the B1-B2 transition in ferropericlase at tera-Pascal pressures | Ferropericlase (fp), (Mg$_{1-x}$Fe$_x$)O, the second most abundant mineral in
the Earth's lower mantle, is expected to be an essential component of
super-Earths' mantles. Here we present an ab initio investigation of the
structure and magnetic ground state of fp up to $\sim$ 3 TPa with iron
concentrations (x$_{Fe}$) va... | 2109.11008v2 |
2021-09-26 | Superconducting gap and pseudogap in the surface states of the iron-based superconductor PrFeAsO$_{1-y}$ studied by angle-resolved photoemission spectroscopy | In order to study the possible superconductivity at the polar surfaces of
1111-type iron-based superconductors, which is doped with a large amount of
holes in spite of the electron doping in bulk materials, we have performed
angle-resolved photoemission spectroscopy (ARPES) studies on superconducting
PrFeAsO$_{1-y}$~cr... | 2109.12522v2 |
2021-09-28 | Atomistic Graph Neural Networks for metals: Application to bcc iron | The prediction of the atomistic structure and properties of crystals
including defects based on ab-initio accurate simulations is essential for
unraveling the nano-scale mechanisms that control the micromechanical and
macroscopic behaviour of metals. Density functional theory (DFT) can enable the
quantum-accurate predi... | 2109.14012v1 |
2021-09-30 | Atomistic simulation of the FEBID-driven growth of iron-based nanostructures | The growth of iron-containing nanostructures in the process of focused
electron beam-induced deposition (FEBID) of Fe(CO)$_5$ is studied by means of
atomistic irradiation-driven molecular dynamics (IDMD) simulations. The
geometrical characteristics (lateral size, height and volume), morphology and
metal content of the ... | 2109.15191v2 |
2021-10-06 | Novel Model of an Ultra-stripped Supernova Progenitor of a Double Neutron Star | Recent discoveries of double neutron star (DNS) mergers and ultra-stripped
supernovae (SNe) raise the questions of their origin and connection. We present
the first 1D~model of a DNS progenitor system which is calculated
self-consistently until an ultra-stripped iron core collapse. We apply the
\texttt{MESA} code start... | 2110.02979v1 |
2021-10-11 | Dispersionless orbital excitations in (Li,Fe)OHFeSe superconductors | The superconducting critical temperature $T_{\mathrm{c}}$ of intercalated
iron-selenide superconductor (Li,Fe)OHFeSe (FeSe11111) can be increased to 42 K
from 8 K of bulk FeSe. It shows remarkably similar electronic properties as the
high-$T_{\mathrm{c}}$ monolayer FeSe and provides a bulk counterpart to
investigate th... | 2110.05361v2 |
2021-10-21 | Competing Vortex Topologies in Iron-based Superconductors | In this work, we establish a new theoretical paradigm for vortex Majorana
physics in the recently discovered topological iron-based superconductors
(tFeSCs). While tFeSCs are widely accepted as an exemplar of topological
insulators (TIs) with intrinsic $s$-wave superconductivity, our theory implies
that such common bel... | 2110.11357v2 |
2021-11-17 | Exoplanetary Interiors | The first mass-estimate of an exoplanet around a Sun-like star, 51 Peg b and
the first radius measurement of an exoplanet, HD209458b pointed to the
challenges of understanding the atmosphere, interior, and evolution of
exoplanets including the possibility of mass loss of planets on close-orbits
that are exposed to stro... | 2111.09357v1 |
2022-01-07 | Correlation-Driven Electronic Reconstruction in FeTe$_{1-x}$Se$_x$ | Electronic correlation is of fundamental importance to high temperature
superconductivity. While the low energy electronic states in cuprates are
dominantly affected by correlation effects across the phase diagram,
observation of correlation-driven changes in fermiology amongst the iron-based
superconductors remains ra... | 2201.02667v1 |
2022-02-24 | Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(Fe$_{0.96}$Ni$_{0.04}$)$_4$As$_4$ with Spin-Vortex Crystal Order | The spin-orbit coupling (SOC) is a key to understand the magnetically driven
superconductivity in iron-based superconductors, where both local and itinerant
electrons are present and the orbital angular momentum is not completely
quenched. Here, we report a neutron scattering study on the bilayer compound
CaK(Fe$_{0.96... | 2202.11933v1 |
2022-04-05 | ConfPred: A layered intergrowth structure prediction model based on confinement self-assembly in two-dimensional interlayer space | We constructed a simple but effective model to predict the layered
intergrowth structures by combining the self-assembly phenomenon in confined
space and the sandwich configuration of layered materials. In this model, a
two-dimensional confined space is constructed by two known block layers, such
as the Fe$_2$As$_2$ bl... | 2204.02355v1 |
2022-04-11 | Polarimetry of M-type asteroids in the context of their surface composition | Aims. We aim to investigate how polarimetric observations can improve our
understanding of the nature and diversity of M/X-type asteroids. Methods.
Polarimetric observations of the selected M/X-type asteroids were carried out
at the Tohoku 0.6-m telescope at Haleakala Observatory, Hawaii (simultaneously
in BVR filters)... | 2204.04929v1 |
2022-04-20 | Long Term X-Ray Spectral Variation of the Wolf-Rayet Binary WR 102-1 in the Galactic bulge: evidence for wind distortion in the binary | WR~102-1 was detected by Suzaku as a conspicuous point source in the 6.7 keV
intensity map of the central region of the Milky Way. The source was suggested
as a possible Wolf-Rayet binary based on its X-ray and infrared spectral
characteristics. The iron line emission is expected to originate in the
Wolf-Rayet star's d... | 2204.09349v1 |
2022-06-20 | Prevalence of short-lived radioactive isotopes across exoplanetary systems inferred from polluted white dwarfs | In the Solar System short-lived radioisotopes, such as 26Al, played a crucial
role during the formation planetary bodies by providing a significant
additional source of heat. Notably, this led to early and large-scale melting
and iron core formation in planetesimals and their loss of volatile elements,
such as hydrogen... | 2206.09675v1 |
2022-06-30 | Magnetic field measurements on the mini-ICAL detector using Hall probes | The magnetised 51 kton Iron Calorimeter (ICAL) detector proposed to be built
at INO is designed with a focus on detecting 1-20 GeV muons. The magnetic field
will enable the measurement of the momentum of the $\mu^-$ and $\mu^+$
generated from the charge current interactions of $\nu_\mu$ and $\bar\nu_\mu$
separately wit... | 2206.15082v1 |
2022-07-01 | Particle acceleration and radiation reaction in a strongly magnetized rotating dipole | Abridged. Neutron stars are surrounded by ultra-relativistic particles
efficiently accelerated by ultra strong electromagnetic fields. However so far,
no numerical simulations were able to handle such extreme regimes of very high
Lorentz factors and magnetic field strengths. It is the purpose of this paper
to study par... | 2207.00624v1 |
2022-08-10 | Dimensionality and Background Cancellation in Energy Selective X-Ray Imaging | Purpose: The set of linear attenuation coefficients that belong to materials
in the human body is commonly assumed to be spanned by two basis functions in
the range of clinical x-ray energies, even though there is evidence that the
dimensionality of this set is greater than two. It has not yet been clear that
the use o... | 2208.05362v1 |
2022-08-11 | Atomistic fracture in bcc iron revealed by active learning of Gaussian approximation potential | The prediction of atomistic fracture mechanisms in body-centred cubic (bcc)
iron is essential for understanding its semi-brittle nature. Existing atomistic
simulations of the crack-tip deformation mechanisms under mode-I loading based
on classical interatomic potentials yield contradicting predictions. To enable
fractu... | 2208.05912v2 |
2022-08-12 | Thermal Evolution and magnetic history of rocky planets | We present a thermal evolution model coupled with a Henyey solver to study
the circumstances under which a rocky planet could potentially host a dynamo in
its liquid iron core and/or magma ocean. We calculate the evolution of planet
thermal profiles by solving the energy balance equations for both the mantle
and the co... | 2208.06523v1 |
2022-09-10 | Discovery of a pair density wave state in a monolayer high-Tc iron-based superconductor | The pair density wave (PDW) is an extraordinary superconducting state where
Cooper pairs carry nonzero momentum. It can emerge when the full condensation
of zero momentum Cooper pairs is frustrated. Evidence for the existence of
intrinsic PDW order in high-temperature (high-Tc) cuprate superconductors and
kagome superc... | 2209.04592v2 |
2022-09-16 | Spin fluctuations in the 112-type iron-based superconductor Ca$_{0.82}$La$_{0.18}$Fe$_{0.96}$Ni$_{0.04}$As$_{2}$ | We report time-of-flight inelastic neutron scattering (INS) investigations on
the spin fluctuation spectrum in the 112-type iron-based superconductor (FeSC)
Ca$_{0.82}$La$_{0.18}$Fe$_{0.96}$Ni$_{0.04}$As$_{2}$ (CaLa-112). In comparison
to the 122-type FeSCs with a centrosymmetric tetragonal lattice structure
(space gro... | 2209.07726v1 |
2022-10-04 | Strengthened proximity effect at grain boundaries to enhance inter-grain supercurrent in Ba1-xKxFe2As2 superconductors | Iron-based superconductors have great potential for high-power applications
due to their prominent high-field properties. One of the central issues in
enhancing the critical current density of iron-based superconducting wires is
to reveal the roles and limitations of grain boundaries in supercurrent
transport. Here, we... | 2210.01305v1 |
2022-10-18 | In-plane electronic anisotropy revealed by interlayer resistivity measurements on the iron-based superconductor parent compound CaFeAsF | Both cuprates and iron-based superconductors demonstrate nematicity, defined
as the spontaneous breaking of rotational symmetry in electron systems. The
nematic state can play a role in the high-transition-temperature
superconductivity of these compounds. However, the microscopic mechanism
responsible for the transport... | 2210.09533v2 |
2022-10-19 | X-ray spectroscopy of the accretion disk corona source 2S 0921-630 with Suzaku archival data | 2S 0921$-$630 is an eclipsing low-mass X-ray binary (LMXB) with an orbital
period of $\sim$ 9 days. Past X-ray observations have revealed that 2S
0921$-$630 has an extended accretion disk corona (ADC), from which most of the
X-rays from the system are emitted. We report the result of our Suzaku archival
data analysis o... | 2210.10792v1 |
2022-11-02 | Fourier Disentangled Multimodal Prior Knowledge Fusion for Red Nucleus Segmentation in Brain MRI | Early and accurate diagnosis of parkinsonian syndromes is critical to provide
appropriate care to patients and for inclusion in therapeutic trials. The red
nucleus is a structure of the midbrain that plays an important role in these
disorders. It can be visualized using iron-sensitive magnetic resonance imaging
(MRI) s... | 2211.01353v1 |
2022-12-05 | Quasi two-dimensional nature of high-Tc superconductivity in iron-based (Li,Fe)OHFeSe | The intercalated iron selenide (Li,Fe)OHFeSe has a strongly layered structure
analogous to the quasi two-dimensional (2D) bismuth cuprate superconductors,
and exhibits both high-temperature (Tc) and topological superconductivity.
However, the issue of its superconductivity dimensionality has not yet been
fully investig... | 2212.02022v1 |
2022-12-19 | Exchange interactions in iron and nickel: DFT+DMFT study in paramagnetic phase | We analyze possible ways to calculate magnetic exchange interactions within
the density functional theory plus dynamical mean-field theory (DFT+DMFT)
approach in the paramagnetic phase. Using the susceptibilities obtained within
the ladder DMFT approach together with the random phase approximation result
for the Heisen... | 2212.09267v2 |
2023-02-08 | Microstructure-dependent magnetic properties of iron silicon single, bi- and oligo-crystals measured with a miniaturised Single-Sheet-Tester | Electrical iron silicon steel is the most commonly used soft magnetic
material in electrical energy conversion and transmission, and its demand is
expected to increase with the need for electrification of the transportation
sector and the transition to renewable energy to combat climate change.
Although iron silicon st... | 2302.03808v1 |
2023-02-08 | Plant-wide byproduct gas distribution under uncertainty in iron and steel industry via quantile forecasting and robust optimization | In the modern iron and steel industry, the efficient distribution of
byproduct gases faces significant challenges due to quantity- and
quality-related uncertainties of gases. This study presents an optimal approach
to gas distribution that addresses this issue by incorporating the energy flow
network and the uncertain ... | 2302.03946v2 |
2023-02-28 | Spectroscopic studies of the superconducting gap in the 12442 family of iron-based compounds | The iron-based compounds of the so-called 12442 family are very peculiar in
various respects. They originate from the intergrowth of 122 and 1111 building
blocks, display a large in-plane vs. out-of-plane anisotropy, possess double
layers of FeAs separated by insulating layers, and are generally very similar
to double-... | 2302.14767v2 |
2023-03-08 | Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure | We theoretically study the proximity effect and the inverse proximity effect
in a topological insulator/iron-based superconductor heterostructure based on
the microscopic model. The superconducting order parameter is self-consistently
calculated. Its magnitude decreases when the coupling of these two systems
increases.... | 2303.04586v1 |
2023-03-16 | Nucleosynthesis in neutrino-heated ejecta and neutrino-driven winds of core-collapse supernovae; neutrino-induced nucleosynthesis | The innermost ejecta of core-collapse supernovae are considered to be the
sources of some iron-group and heavier nuclei. The ejecta are predominantly
driven by neutrino heating, principally due to neutrino capture on free
neutrons and protons. Such neutrino interaction plays a crucial role for
setting neutron richness ... | 2303.09442v1 |
2023-03-28 | Iron-rich Metal-poor Stars and the Astrophysics of Thermonuclear Events Observationally Classified as Type Ia Supernovae. I. Establishing the Connection | The progenitor systems and explosion mechanisms responsible for the
thermonuclear events observationally classified as Type Ia supernovae are
uncertain and difficult to uniquely constrain using traditional observations of
Type Ia supernova host galaxies, progenitors, light curves, and remnants. For
the subset of thermo... | 2303.16357v1 |
2023-04-11 | Orbital Selective Mott Transition Effects and Non-Trivial Topology of Iron Chalcogenide | The iron-based superconductor FeSe$_{1-x}$Te$_{x}$ (FST) has recently gained
significant attention as a host of two distinct physical phenomena: ($i$)
Majorana zero modes which can serve as potential topologically protected
qubits, and ($ii$) a realization of the orbital selective Mott transition
(OSMT). In this Letter... | 2304.05002v2 |
2023-04-12 | Charge order driven by multiple-Q spin fluctuations in heavily electron-doped iron selenide superconductors | Intertwined spin and charge orders have been widely studied in
high-temperature superconductors, since their fluctuations may facilitate
electron pairing; however, they are rarely identified in heavily electron-doped
iron selenides. Here, using scanning tunneling microscopy, we show that when
the superconductivity of (... | 2304.05854v1 |
2023-04-22 | A Multi-frequency Magnetic Particle Spectroscopy System for the Characterization of Magnetic Nanoparticles | Magnetic particle spectroscopy (MPS) is one of the most versatile methods to
characterize the magnetic properties of magnetic nanoparticles (MNPs). The
excitation magnetic field is one of the most crucial factors that affects the
MPS signal of the MNPs. In this study, a multi-frequency MPS system is
developed to invest... | 2304.11290v1 |
2023-05-10 | The spin measurement of MAXI J0637-430: a black hole candidate with high disk density | The Galactic black hole candidate MAXI J0637-430 was first discovered by
$\textit{MAXI/GSC}$ on 2019 November 02. We study the spectral properties of
MAXI J0637-430 by using the archived $\textit{NuSTAR}$ data and
$\textit{Swift}$/XRT data. After fitting the eight spectra by using a disk
component and a powerlaw compon... | 2305.05914v1 |
2023-07-20 | Stray magnetic field imaging of thin exfoliated iron halides flakes | Magnetic van der Waals materials are often proposed for use in future
spintronic devices, aiming to leverage the combination of long-range magnetic
order and near-atomic thinness to produce energy-efficient components. One
class of material that has been discussed in this context are the iron halides
FeCl$_2$ and FeBr$... | 2307.10561v1 |
2023-07-20 | Tuning superconductivity and spin-vortex fluctuations in CaKFe$_4$As$_4$ through in-plane antisymmetric strains | Lattice strains of appropriate symmetry have served as an excellent tool to
explore the interaction of superconductivity in the iron-based superconductors
with nematic and stripe spin-density wave (SSDW) order, which are both closely
tied to an orthorhombic distortion. In this work, we contribute to a broader
understan... | 2307.10604v1 |
2023-09-07 | The impact of rare events on the chemical enrichment in dwarf galaxies | In the environments where the abundance of heavy elements is low, rare events
are expected to impact the chemical enrichment. Dwarf galaxies have small
masses, low average metallicities and in general low star formation rates, and
thus investigating the chemical enrichment provides understanding on the impact
of each s... | 2309.03795v1 |
2023-09-29 | Fossil and present-day stromatolite ooids contain a meteoritic polymer of glycine and iron | Hemoglycin, a space polymer of glycine and iron, has been identified in the
carbonaceous chondritic meteorites Allende, Acfer 086, Kaba, Sutters Mill and
Orgueil. Its core form has a mass of 1494Da and is basically an antiparallel
pair of polyglycine strands linked at each end by an iron atom. The polymer
forms two- an... | 2309.17195v2 |
2023-10-17 | Dealing with broad-band X-ray spectra of faint AGN: a case study | In this work we analyse 3 average-luminosity hard X-ray selected AGN: ESO
506-G27, IGR J19039+3344 and NGC 7465. They have simultaneous Swift/XRT and
NuSTAR data never published before and have been poorly studied at X-ray
energies. These sources make for interesting targets both from a methodological
and scientific po... | 2310.11319v1 |
2023-11-04 | On the likely magnesium-iron silicate dusty tails of catastrophically evaporating rocky planets | Catastrophically evaporating rocky planets provide a unique opportunity to
study the composition of small planets. The surface composition of these
planets can be constrained via modelling their comet-like tails of dust. In
this work, we present a new self-consistent model of the dusty tails: we
physically model the tr... | 2311.02477v2 |
2023-11-24 | Layer-dependent superconductivity in iron-based superconductors | The Hohenberg-Mermin-Wagner theorem states that a two-dimensional system
cannot spontaneously break a continuous symmetry at finite temperature. This is
supported by the observation of layer-dependent superconductivity in the
quasi-two-dimensional superconductor NbSe2, in which the superconducting
transition temperatur... | 2311.14559v1 |
2023-11-29 | Magnetic field simulations and measurements on the mini-ICAL detector | The ICAL (Iron Calorimeter) is a 51 kTon magnetized detector proposed by the
INO collaboration. It is designed to detect muons with energies in the 1-20 GeV
range. A magnetic field of about 1.5 T in the ICAL detector will be generated
by passing a DC current through suitable copper coils. This will enable it to
disting... | 2311.17364v1 |
2023-11-30 | Highly efficient and transferable interatomic potentials for α-iron and α-iron/hydrogen binary systems using deep neural networks | Artificial neural network potentials (NNPs) have emerged as effective tools
for understanding atomic interactions at the atomic scale in various phenomena.
Recently, we developed highly transferable NNPs for {\alpha}-iron and
{\alpha}-iron/hydrogen binary systems (Physical Review Materials 5 (11),
113606, 2021). These ... | 2311.18686v1 |
2023-12-08 | Numerical determination of iron dust laminar flame speeds with the counterflow twin-flame technique | Iron dust counter-flow flames have been studied with the low-Mach-number
combustion approximation. The model considers full coupling between the two
phases, including particle/droplet drag. The dispersed phase flow strain
relations are derived under the assumption of low Reynolds number conditions.
The importance of so... | 2312.04994v1 |
2023-12-19 | The distribution of impactor core material during large impacts on Earth-like planets | Large impacts onto young rocky planets may transform their compositions,
creating highly reducing conditions at their surfaces and reintroducing highly
siderophile metals to their mantles. Key to these processes is the availability
of an impactor's chemically reduced core material (metallic iron). It is,
therefore, imp... | 2312.12132v1 |
2023-12-30 | Evidence of grain alignment by magnetically enhanced radiative torques from multi-wavelength dust polarization modeling of HL Tau | Atacama Large Millimeter/Submillimeter Array (ALMA) has revolutionized the
field of dust polarization in protoplanetary disks across multiple wavelengths.
Previous observations and empirical modeling suggested multiple mechanisms of
dust polarization toward HL Tau, including grain alignment and dust scattering.
However... | 2401.00220v1 |
2024-02-13 | A Search for Magnetized Quark Nuggets (MQNs), a Candidate for Dark Matter, Accumulating in Iron Ore | A search has been carried out for Magnetized Quark Nuggets (MQNs)
accumulating in iron ore over geologic time. MQNs, which are theoretically
consistent with the Standard Models of Physics and of Cosmology, have been
suggested as dark-matter candidates. Indirect evidence of MQNs has been
previously inferred from observa... | 2402.08163v1 |
2024-03-28 | Combine Influences of Nanoparticulate Hematite Thin Film Thickness, Roughness, and Weight on Its Photoelectrochemical Performance and Viscous/ Thermal Characteristics of Source Precursor | The objective of this work was to investigate the photoelectrochemical (PEC)
performance of nanoparticulate hematite thin film photoelectrodes prepared by a
soft-chemistry route. Two cost-effective thin film fabrication techniques were
employed to deposit the hematite film. First, the film was deposited on
conducting g... | 2403.19069v1 |
2024-03-28 | Synthetic Oil Gels With Organoclays In The Formulation Of Magnetorheological Fluids | Magnetorheological fluids (MRF) are smart composite materials that, under an
external magnetic field, show a reversible solid-liquid transition in less than
10 ms. This study aimed to evaluate which organoclays would jellify a synthetic
oil for the formulation of MRF. Three dispersant additives for carbonyl iron
powder... | 2403.19774v1 |
1998-06-25 | Low-Metallicity Inhibition of Type Ia Supernovae and Galactic and Cosmic Chemical Evolution | We introduce a metallicity dependence of Type Ia supernova (SN Ia) rate into
the Galactic and cosmic chemical evolution models. In our SN Ia progenitor
scenario, the accreting white dwarf (WD) blows a strong wind to reach the
Chandrasekhar mass limit. If the iron abundance of the progenitors is as low as
[Fe/H] < -1, t... | 9806335v1 |
1999-02-08 | Metallicity Gradients in the Intracluster Gas of Abell 496 | Analysis of spatially resolved ASCA spectra of the intracluster gas in Abell
496 confirms there are mild metal abundance enhancements near the center, as
previously found by White et al. (1994) in a joint analysis of Ginga LAC and
Einstein SSS spectra. Simultaneous analysis of spectra from all ASCA
instruments (SIS + G... | 9902112v2 |
1999-03-24 | Further studies of 1E 1740.7-2942 with ASCA | We report the ASCA results of the Great Annihilator 1E 1740.7-2942 obtained
with five pointing observations in a time span of 3.5 years. The X-ray spectrum
for each period is well fitted with a single power-law absorbed by a high
column of gas. The X-ray flux changes by a factor of 2 from period to period,
but the othe... | 9903376v2 |
1999-05-20 | Soft X-ray spectroscopy of Compton-thick Seyfert 2 galaxies with BeppoSAX | We present a X-ray spectroscopic study of the bright Compton-thick Seyfert 2s
NGC1068 and the Circinus Galaxy, performed with BeppoSAX. Matt et al. (1997 and
1998) interpreted the spectrum above 4 keV as the superposition of Compton
reflection and warm plasma scattering of the nuclear radiation. When this
continuum is ... | 9905261v1 |
2000-02-22 | Non-LTE Effects in Berylium Abundances | In this work we analyze the beryllium-iron chemical diagram from the point of
view of non-LTE effects. Be abundances were re-calculated by considering
non-LTE corrections in ionization equilibrium (logg) and Fe abundances
([Fe/H]). These corrections seem do not affect the linear relation between
Be-Fe for metal-poor st... | 0002408v1 |
2000-05-01 | Reflected Iron Line From a Source Above a Kerr Black Hole Accretion Disc | In this paper we present a fully relativistic approach to modelling both the
continuum emission and the reflected fluorescent iron line from a primary X-ray
source near a Kerr black hole. The X-ray source is located above an accretion
disc orbiting around the black hole. The source is assumed to be a static point
sourc... | 0005020v1 |
2000-05-30 | BeppoSAX broad-band observations of low-redshift quasars: Spectral curvature and iron K_alpha lines | We present results from BeppoSAX observations of 10 low redshift quasars. The
quasars are part of the Laor et al. (1997) sample of 23 optically selected PG
quasars with redshift <0.4 and low Galactic absorption along the line of sight.
Significant spectral curvature is detected for the 6 quasars with the highest
signal... | 0005567v1 |
2000-10-20 | Abundances and Evolution of Lithium in the Galactic Halo and Disk | We have measured the Li abundance of 18 stars with -2 <~ [Fe/H] ~< -1 and
6000 K <~ Teff <~ 6400 K, a parameter range that was poorly represented in
previous studies. We examine the Galactic chemical evolution (GCE) of this
element, combining these data with previous samples of turnoff stars over the
full range of halo... | 0010411v1 |
2000-11-28 | Presupernova Evolution with Improved Rates for Weak Interactions | Recent shell-model calculations of weak-interaction rates for nuclei in the
mass range A = 45 - 65 have resulted in substantial revisions to the hitherto
standard set of Fuller, Fowler, & Newman (FFN). In particular, key
electron-capture rates, such as that for Co60 are much smaller. We consider
here the effects of the... | 0011507v1 |
2001-01-24 | Issues of LiBeB, Oxygen and Iron Evolution | We discuss the highlights of our recent research, specifically the refractory
vs. volatile interpretation of the rise of [O/Fe] with decreasing [Fe/H], and
the issue of primary vs. secondary evolution of Be. | 0101432v1 |
2001-12-05 | Caught in the Act; Chandra Observations of Microlensing of the Radio-Loud Quasar MG J0414+0534 | We present results from monitoring of the distant (z = 2.64), gravitationally
lensed quasar MG J0414+0534 with the Chandra X-ray Observatory. An Fe Ka line
at 6.49 +/- 0.09 keV (rest-frame) with an equivalent width of ~ 190eV
consistent with fluorescence from a cold medium is detected at the 99 percent
confidence level... | 0112112v1 |
2001-12-07 | Fe Kαemission from photoionized slabs: the impact of the iron abundance | Iron K\alpha emission from photoionized and optically thick material is
observed in a variety of astrophysical environments including X-ray binaries,
active galactic nuclei, and possibly gamma-ray bursts. This paper presents
calculations showing how the equivalent width (EW) of the Fe K line depends on
the iron abundan... | 0112179v1 |
2002-06-04 | Resolving the Effects of Resonant X-ray Line Scattering in Cen X-3 with Chandra | The massive X-ray binary Cen X-3 was observed over approximately one quarter
of the system's 2.08 day orbit, beginning before eclipse and ending slightly
after eclipse center with the Chandra X-ray Observatory using its High-Energy
Transmission Grating Spectrometer. The spectra show K shell emission lines from
hydrogen... | 0206065v2 |
2002-12-03 | Fluorescent iron lines as a probe of astrophysical black hole systems | (abridged) With most physicists and astrophysicists in agreement that black
holes do indeed exist, the focus of astrophysical black hole research has
shifted to the detailed properties of these systems. Nature has provided us
with an extremely useful probe of the region very close to an accreting black
hole - X-ray irr... | 0212065v2 |
2003-04-01 | XMM-Newton observations of Broad FeKalpha emission from a Seyfert 1.9 galaxy MCG-5-23-16 | XMM-Newton observations of the bright Seyfert 1.9 galaxy MCG-5-23-16 have
revealed a broad FeKalpha emission line which is nearly symmetric in contrast
to the broad and red-shifted asymmetric FeKalpha line sometimes observed from
Seyfert 1 galaxies. The FeKalpha line has two distinct components - a narrow
unresolved co... | 0304037v1 |
2003-12-01 | On Sensitivity of Cherenkov Radiation to the Dynamics of High Energy Cosmic Ray Interactions | A simulation study of the effects resulting from creation of quark--gluon
plasma in high energy collisions of cosmic iron nuclei with the air has been
carried out. The Cherenkov light emission has been found to reveal some
features of the dynamics of high energy hadronic interactions. | 0312027v1 |
2003-12-11 | IZw1 observed with XMM-Newton: Low-energy spectral complexity, iron lines, and hard X-ray flares | We present a 20 ks XMM-Newton observation of the prototypical Narrow-Line
Seyfert 1 galaxy IZw1. The best-fit model to the data is a double blackbody
plus a dominant power-law, on which complex soft absorption (possibly a blended
edge or absorption lines) and/or OVII emission are superimposed, as well as
strong Fe Kalp... | 0312298v1 |
2003-12-12 | XMM-Newton view of the prototype narrow-line Seyfert 1 galaxy I Zw 1 | We present results based on an XMM-Newton observation of the prototype
narrow-line Seyfert 1 galaxy I Zw 1 performed in June 2002. The 0.6-12 keV
spectrum is well described by a steep power-law (Gamma\sim 2.3) and a weak soft
blackbody component (kT \sim 200 eV) below 2 kev. The soft X-ray excess
emission is featureles... | 0312342v1 |
2004-03-02 | Abundance differences between components of wide binaries | In this paper we present iron abundance analysis for 23 wide binaries with
main sequence components in the temperture range 4900-6300 K, taken from the
sample of the pairs currently included in the radial velocity planet search on
going at the TNG. The use of a line-by-line differential analysis technique
between the c... | 0403051v2 |
2004-03-04 | S4N: A Spectroscopic Survey of Stars in the Solar Neighborhood | [ABRIDGED] We report the results of a high-resolution spectroscopic survey of
all the stars more luminous than Mv = 6.5 mag within 14.5 pc from the Sun. We
derive stellar parameters and perform a preliminary abundance and kinematic
analysis of the F-G-K stars in the sample. The inferred metallicity ([Fe/H])
distributio... | 0403108v1 |
2004-05-18 | Iron K-alpha Fluorescent Line Profiles from Spiral Accretion Flows in AGNs | We present 6.4 keV iron K-alpha fluorescent line profiles predicted for a
relativistic black hole accretion disk in the presence of a spiral motion in
Kerr geometry, the work extended from an earlier literature motivated by recent
magnetohydrodynamic (MHD) simulations. The velocity field of the spiral motion,
superpose... | 0405337v1 |
2004-08-23 | An extreme, blueshifted iron line profile in the Narrow Line Seyfert 1 PG 1402+261; an edge-on accretion disk or highly ionized absorption? | We report on a short XMM-Newton observation of the radio-quiet Narrow Line
Seyfert 1 PG 1402+261. The EPIC X-ray spectrum of PG 1402+261 shows a strong
excess of counts between 6-9 keV in the rest frame. This feature can be modeled
by an unusually strong (equivalent width 2 keV) and very broad (FWHM velocity
of 110000 ... | 0408403v1 |
2004-10-28 | Composition of the Solar Interior: Information from Isotope Ratios | Measurements are reviewed showing that the interior of the Sun, the inner
planets, and ordinary meteorites consist mostly of the same elements: Iron,
oxygen, nickel, silicon, magnesium, sulfur and calcium. These results do not
support the standard solar model. | 0410717v1 |
2005-11-15 | Kappa-Mechanism Excitation of Retrograde Mixed Modes in B-Type Stars | The stability of retrograde mixed modes in rotating B-type stars is
investigated. It is found that these modes are susceptible to kappa-mechanism
excitation, due to the iron opacity bump at log T ~ 5.3. The findings are
discussed in the context of the pulsation of SPB and Be stars. | 0511455v1 |
2006-08-08 | XMM-Newton high-resolution spectroscopy reveals the chemical evolution of M 87 | We present here a study of chemical abundances in the giant elliptical galaxy
M 87 using high-resolution spectra obtained with the Reflection Grating
Spectrometers during two deep XMM-Newton observations. While we confirm the
two-temperature structure of the inter-stellar medium (ISM) in M 87, we also
show that a conti... | 0608177v1 |
2006-09-08 | Iron and Nickel Line Diagnostics for the Galactic Center Diffuse Emission | We have observed the diffuse X-ray emission from the Galactic center (GC)
using the X-ray Imaging Spectrometer (XIS) on Suzaku. The high-energy
resolution and the low-background orbit provide excellent spectra of the GC
diffuse X-rays (GCDX). The XIS found many emission lines in the GCDX near the
energy of K-shell tran... | 0609215v1 |
2006-10-16 | Helium and Iron in X-ray galaxy clusters | I discuss the role of the sedimentation of helium in galaxy cluster cores on
the observed X-ray properties and present a history of the metal accumulation
in the ICM, with new calculations with respect to my previous work following
the recent evidence of a bi-modal distribution of the delay time in Supernovae
Type Ia. | 0610466v1 |
2006-10-17 | Suzaku discovery of iron absorption lines in outburst spectra of the X-ray transient 4U 1630-472 | We present the results of six Suzaku observations of the recurrent black hole
transient 4U1630-472 during its decline from outburst from February 8 to March
23 in 2006. All observations show the typical high/soft state spectral shape in
the 2-50keV band, roughly described by an optically thick disk spectrum in the
soft... | 0610496v1 |
2006-11-01 | Magnetic flares in Active Galactic Nuclei: Modeling the iron Kalpha-line | The X-ray spectra of Active Galactic Nuclei (AGN) are complex and vary
rapidly in time as seen in recent observations. Magnetic flares above the
accretion disk can account for the extreme variability of AGN. They also
explain the observed iron Kalpha fluorescence lines. We present radiative
transfer modeling of the X-r... | 0611020v1 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.