publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2018-05-02 | The Problem of the High Iron Abundance in Accretion Disks around Black Holes | In most accreting black-hole systems the copious X-rays commonly observed
from the inner-most regions are accompanied by a reflection spectrum. The
latter is the signature of energetic photons reprocessed by the optically thick
material of an accretion disk. Given their abundance and fluorescence yield,
the iron K-shel... | 1805.00581v1 |
2018-10-25 | Limits on stable iron in Type$\,$Ia supernovae from NIR spectroscopy | We obtained optical and near-infrared spectra of Type$\,$Ia supernovae
(SNe$\,$Ia) at epochs ranging from 224 to 496 days after the explosion. The
spectra show emission lines from forbidden transitions of singly ionised iron
and cobalt atoms. We used non-local thermodynamic equilibrium (NLTE) modelling
of the first and... | 1810.10781v1 |
2019-02-06 | Partial order induced superconductivity in $Fe^{2+}$ iron | In this letter, we address a novel mechanism for iron based superconductors.
We study $F^{2+}$ state of iron with six 3d electrons. Five of them are
localized with ferromagnetic order, while the sixth one is itinerant
antiparallel with the localized ones. We consider spin-fermion model of 3d
electrons and show that one... | 1902.02290v2 |
2020-05-27 | Prediction of exotic magnetic states in the alkali metal quasi-one-dimensional iron selenide compound Na$_2$FeSe$_2$ | The magnetic and electronic phase diagram of a model for the
quasi-one-dimensional alkali metal iron selenide compound Na$_2$FeSe$_2$ is
presented. The novelty of this material is that the valence of iron is
Fe$^{2+}$ contrary to most other iron-chain compounds with valence Fe$^{3+}$.
Using first-principles techniques,... | 2005.13132v1 |
2020-10-01 | Molecular Dynamics Simulation for the Analysis of Mechanical Properties and Effect of Stone-Wales and BiVacancy Defect on Carbon Nanotube Reinforced Iron Composites | Carbon nanotube (CNT) reinforced metal matrix composites (MMCs) are gaining
the attention of the researchers because of their demand in space and
automobile industries for having low weight and high mechanical properties.
Iron is the most used metal in all engineering fields. Therefore, reinforcing
iron with CNT can re... | 2010.00275v1 |
2021-01-19 | Quantitative analysis of iron sand mineral content from the south coast of Cidaun, West Java using rietveld refinement method | Iron sand is one of the abundant natural resources in Indonesia, especially
on the south coast of Cidaun; West Java which is the basic material for
building and metal industry. Iron mineral content is generally metal oxide such
as magnetite, hematite and silica/quartz. Sand with iron content used in this
study is deriv... | 2101.10442v1 |
2021-10-20 | Manifestations of Spinodal Decomposition into Dilute Pd$_{1-x}$Fe$_{x}$ "Phases" in Iron-Implanted Palladium Films: FMR Study | Palladium-iron alloys produced by high-dose implantation of iron ions into
epitaxial palladium films were investigated with the ferromagnetic resonance
(FMR) and vibrating sample magnetometry (VSM) techniques. The samples reveal
distinct multiple FMR responses depending on the dose of iron ion implantation.
The post-im... | 2110.10397v1 |
2021-11-02 | Structure and motifs of iron oxides from 1 to 3 TPa | Iron oxides are fundamental components of planet-forming materials.
Understanding the Fe-O system's behavior and properties under high pressure can
help us identify many new phases and states possible in exoplanetary interiors,
especially terrestrial ones. Using the adaptive genetic algorithm (AGA), we
investigate the ... | 2111.01305v2 |
2022-01-07 | Online 3-Axis Magnetometer Hard-Iron and Soft-Iron Bias and Angular Velocity Sensor Bias Estimation Using Angular Velocity Sensors for Improved Dynamic Heading Accuracy | This article addresses the problem of dynamic on-line estimation and
compensation of hard-iron and soft-iron biases of 3-axis magnetometers under
dynamic motion in field robotics, utilizing only biased measurements from a
3-axis magnetometer and a 3-axis angular rate sensor. The proposed magnetometer
and angular veloci... | 2201.02449v1 |
2022-10-19 | GRB 180325A: dust grain-size distribution and interstellar iron nanoparticles contribution | We modelled dust grain-size distributions for carbonaceous and silicates
dust, as well as for free-flying iron nanoparticles in the environment of a
$\gamma$-ray burst (GRB) afterglow, GRB 180325A. This GRB, at $z=2.2486$, has
an unambiguous detection of the 2175 \r{A} extinction feature with $R_V=4.58$
and $A_V=1.58$.... | 2210.10423v1 |
2023-01-30 | The Curie line in protoplanetary disks and the formation of Mercury-like planets | In laboratory experiments, we heated chondritic material up to 1400K in a
hydrogen atmosphere. Moessbauer spectroscopy and magnetometry reveal that, at
high temperatures, metallic iron forms from silicates. The transition
temperature is about 1200K after 1 h of tempering, likely decreasing to about
1000K for longer tem... | 2301.12910v1 |
2023-02-28 | Correlating Chemical Reaction and Mass Transport in Hydrogen-based Direct Reduction of Iron Oxide | Steelmaking contributes 8% to the total CO2 emissions globally, primarily due
to coal-based iron ore reduction. Clean hydrogen-based ironmaking has variable
performance because the dominant gas-solid reduction mechanism is set by the
defects and pores inside the mm-nm sized oxide particles that change
significantly as ... | 2302.14215v2 |
2023-04-26 | The width-flux relation of the broad iron line during the state transition of the black hole X-ray binaries | The observation of varying broad iron lines during the state transition of
the black hole X-ray binaries (BHXBs) have been accumulating.In this work, the
relation between the normalized intensity and the width of iron lines is
investigated, in order to understand better the variation of iron lines and
possibly its conn... | 2304.13358v1 |
2023-05-09 | Reproduction Experiments of Radial Pyroxene Chondrules Using a Gas-jet Levitation System under Reduced Conditions | Reproduction experiments of radial pyroxene (RP) chondrules were carried out
using an Ar-$\mathrm{H_2}$ or Ar gas-jet levitation system in a reducing
atmosphere in order to simulate chondrule formation in the protoplanetary disk.
The experiments reproduced RP-chondrule textures, consisting of sets of thin
pyroxene crys... | 2305.05787v4 |
2023-07-31 | Trading oxygen for iron I: the [O/Fe] -- specific star formation rate relation of galaxies | Our current knowledge of star-forming metallicity relies primarily on
gas-phase oxygen abundance measurements. This may not allow one to accurately
describe differences in stellar evolution and feedback driven by variations in
iron abundance. $\alpha$-elements (such as oxygen) and iron are produced by
sources that oper... | 2308.00023v1 |
2023-08-28 | R-Matrix calculations for opacities.II. Photoionization and oscillator strengths of iron ions FeXVII, FeXVIII and FeXIX | Iron is the dominant heavy element that plays an important role in radiation
transport in stellar interiors. Owing to its abundance and large number of
bound levels and transitions, iron ions determine the opacity more than any
other astrophysically abundant element. A few iron ions constitute the
abundance and opacity... | 2308.14854v1 |
2023-09-05 | Calculated iron $L_{2,3}$ x-ray absorption and XMCD of spin-crossover Fe(phen)$_{2}$(NCS)$_{2}$ molecule adsorbed on Cu(001) surface | The PAW method has been used to compute the iron L$_{2,3}$ edges of x-ray
absorption spectra (XAS) and x-ray magnetic circular dichroism (XMCD) of the
spin-crossover Fe(phen)$_{2}$(NCS)$_{2}$ molecule when adsorbed on Cu(001)
surface and in the gas phase, for both the high spin (HS) and low spin (LS)
states. It is foun... | 2309.02078v1 |
2024-01-29 | Pulsed Iron line Emission from the First Galactic Ultraluminous X-ray Pulsar Swift J0243.6+6124 | We report the phase-resolved spectral results of the first Galactic Pulsating
Ultra-Luminous X-ray source (PULX) Swift J0243.6+6124, modeling at its
2017-2018 outburst peak using data collected by the Hard X-ray Modulation
Telescope (Insight-HXMT). The broad energy coverage of Insight-HXMT allows us
to obtain more accu... | 2401.15992v1 |
1996-09-06 | The Iron Discrepancy in Elliptical Galaxies after ASCA | We present estimates for the iron content of the stellar and diffused
components of elliptical galaxies, as derived respectively from integrated
optical spectra and from ASCA X-ray observations. A macroscopic discrepancy
emerges between the expected iron abundances in the hot interstellar medium
(ISM) and what is indic... | 9609046v1 |
2002-08-22 | How the BAL quasars are quiet | All properties of the quasars known by the author (quietness of the BAL
quasars, Lyman forest, iron in the high-z quasars...) are explained supposing
that the kernel of the quasar is surrounded by a halo containing an accretion
disk and magnetic satellites (no dark matter or fast jet, no variation of the
fine structure... | 0208405v1 |
2003-10-23 | The Iron Project and the RmaX Project | Ongoing activities under an international collaboration of atomic physicists
and astrophysicists under the Iron Project and the RmaX Project, with
applications to X-ray astronomy, are briefly described. | 0310700v1 |
2004-12-14 | Live Fe-60 in the Early Solar System | The latest finding by Hester et al. supports the view of ". . . iron cores of
the inner planets, iron meteorites, and the core of the sun as likely
condensation products from the supernova core." [Science 195, 209 (14 January
1977)] | 0412349v2 |
2005-06-03 | A Chandra HETGS Spectral Study of the Iron K Bandpass in MCG-6-30-15: A Narrow View of the Broad Iron Line | We present a high resolution X-ray spectrum of the iron K bandpass in
MCG-6-30-15 based on a 522 ksec observation with Chandra's High Energy
Transmission Grating Spectrometer. The Chandra spectrum is consistent with the
presence of a relativistically broadened, highly redshifted iron K alpha
emission line with a simila... | 0506082v1 |
2006-10-13 | Suzaku Observations of Iron Lines and Reflection in AGN | Initial results on the iron K-shell line and reflection component in several
AGN observed as part of the Suzaku Guaranteed time program are reviewed. This
paper discusses a small sample of Compton-thin Seyferts observed to date with
Suzaku; namely MCG -5-23-16, MCG -6-30-15, NGC 4051, NGC 3516, NGC 2110, 3C 120
and NGC... | 0610436v1 |
2006-11-28 | Iron line and diffuse hard X-ray emission from the starburst galaxy M82 | We examine the properties of the diffuse hard X-ray emission in the classic
starburst galaxy M82. We use new Chandra ACIS-S observations in combination
with reprocessed archival Chandra ACIS-I and XMM-Newton observations. We find
E~6.7 keV Fe He-alpha emission is present in the central |r| < 200 pc, |z| <
100 pc of M82... | 0611859v1 |
2006-12-08 | Iron Air collision with high density QCD | The color glass condensate approach describes successfully heavy ion
collisions at RHIC. We investigate Iron-air collisions within this approach and
compare results to event generators commonly used in air shower simulations. We
estimate uncertainties in the extrapolation to GZK energies and discuss
implications for ai... | 0612218v1 |
2004-09-03 | Helicoidal ordering in iron perovskites | We consider magnetic ordering in materials with negative charge transfer
energy, such as iron perovskite oxides. We show that for a large weight of
oxygen holes in conduction bands, the double exchange mechanism favors a
helicoidal rather than ferromagnetic spin ordering both in metals, e.g. SrFeO_3
and insulators with... | 0409068v1 |
2009-09-01 | Discovery of the Iron Isotopes | Twenty-eight iron isotopes have so far been observed; the discovery of these
isotopes is discussed. For each isotope a brief summary of the first refereed
publication, including the production and identification method, is presented. | 0909.0091v1 |
2010-01-05 | Response to I. I. Mazin's correspondence on "Electronic correlations in the iron pnictides" | We discuss the discrepancy between the measured optical Drude weight and band
structure calculations in LaFePO and other iron-based superconductors. This
discrepancy is mostly due to mass renormalization arising from electronic
correlation effects. | 1001.0643v1 |
2010-06-07 | Screening of the Raman response in multiband superconductors -- application to iron-pnictides | We performed model calculations of Raman responses for multiband 2D
superconductors. The multiband effects of screening in the A_{1g} symmetry
channel were investigated analytically and numerically for a band structure
model mimicing ARPES data on iron-pnictide materials. An acceptable agreement
between our model calcu... | 1006.1333v1 |
2010-10-13 | Atomic structure and electronic properties of nanotubes of layered iron-based superconductors | The atomic models of nanotubes for layered FeSe, LiFeAs, SrFe2As2, and
LnFeAsO - the parent phases of so-called 11, 111, 122, and 1111 groups of newly
discovered family of iron-based high temperature superconductors are proposed.
On example of SrFe2As2 the electronic properties of predicted nanotubes are
examined and d... | 1010.2624v1 |
2010-11-09 | Iron lines in model disk spectra of galactic black hole binaries | We present angle-dependent, broad-band intensity spectra from accretion disks
around black holes of 10 M$_\odot$. In our computations disks are assumed to be
slim, which means that the radial advection is taken into account while
computing effective temperature of the disk. We attempt to reconstruct
continuum and line ... | 1011.2061v1 |
2010-12-15 | Reply to Comment on "Violation of Anderson's Theorem for the sign-reversing s-wave state of Iron-Pnictide Superconductors" [arXiv:1012.0414] by Y. Bang | We explain that the study of impurity effect in iron pnictides are correctly
calculated based on the T-matrix approximation, contrary to the Comment by
Bang. The replacement T with T-I proposed by Bang breaks the perturbation
theory and is therefore erroneous. | 1012.3307v1 |
2011-01-05 | Pressure study of the new iron-based superconductor K0.8Fe2Se2 | We investigated pressure effects on transition temperature (Tc) of the new
iron-based superconductor K0.8Fe2Se2 using a BeCu/NiCrAl hybrid-type clamped
piston-cylinder cell. The Tc(onset) was 33K at 0.85 GPa. With increasing
pressure, Tc(onset) gradually increased and reached 36.6 K at 2.03 GPa. | 1101.0896v1 |
2011-03-15 | Dirac cone in iron-based high Tc superconductors | The band structure of iron-based superconductors gives rise to yet another
scenario for the appearance of Dirac fermions. A viewpoint on "Observation of
Dirac cone electronic dispersion in BaFe2As2" (Richard et.al., PRL 104, 137001
(2010)). | 1103.2946v1 |
2012-02-10 | A perspective of superconductivity as multiband phenomena: Cuprate, iron and aromatic systems | A theoretical overview of the classes of superconductors encompassing (a)
high-Tc cuprate, (b) iron-based and (c) aromatic superconductors is given.
Emphasis is put on the multiband natures of all the three classes, where the
differences in the multiorbits and their manifestations in the electronic
structures and pairi... | 1202.2170v1 |
2012-05-05 | The mechanism of anisotropic exchange interaction in superconducting iron arsenides | Using a combination of linear response theory and constrained orbital
hybridization approach, we study the mechanism of magnetic exchange interaction
of iron-based superconductor. We reproduce the observed highly anisotropic
exchange interaction, and our constrain-orbital calculation unambiguously
identifies that the a... | 1205.1109v1 |
2013-12-18 | Strongly magnetized iron white dwarfs and the total lepton number violation | The influence of a neutrinoless electron to positron conversion on a cooling
of strongly magnetized iron white dwarfs is studied. | 1312.5343v1 |
2014-06-30 | Magnetic anisotropy in FeSb studied by 57Fe Mössbauer spectroscopy | The Fe(1+x)Sb compound has been synthesized close to stoichiometry with x =
0.023(8). The compound was investigated by 57Fe M\"ossbauer spectroscopy in the
temperature range 4.2 - 300 K. The antiferromagnetic ordering temperature was
found as 232 K i.e. much higher than for the less stoichiometric material.
Regular iro... | 1406.7767v2 |
2014-07-18 | Iron-free detectors for future linear colliders | We continue consideration of Iron-free magnetic systems for possible
application in detectors for high energy collider. In particular we suggest a
new type of magnetic system with the multiple flux-return solenoids. This
system allows reaching higher field level at IP compared with traditional ones. | 1407.5056v1 |
2014-11-27 | The critical relaxation of the model of iron-vanadium magnetic superlattice | The critical relaxation of iron-vanadium magnetic superlattice in case of the
equality between interlayer and intralayer exchange interactions is
investigated. The dynamic and static critical exponents of the model are
calculated. A value of the critical temperature is evaluated. | 1411.7505v1 |
2015-08-26 | Nuclear Reactions For Nucleosynthesis Beyond Fe | Many more nuclear transitions have to be known in the determination of
stellar reactivities for trans-iron nucleosynthesis than for reactions of light
nuclei. This requires different theoretical and experimental approaches. Some
of the issues specific for trans-iron nucleosynthesis are discussed. | 1508.06569v1 |
2015-10-06 | Local Stellar Kinematics from RAVE data - VI. Metallicity Gradients Based on the F-G Main-sequence Stars | We estimated iron and metallicity gradients in the radial and vertical
directions with the F and G type dwarfs taken from the RAVE DR4 database. The
sample defined by the constraints Zmax<=825 pc and ep<=0.10 consists of stars
with metal abundances and space velocity components agreeable with the
thin-disc stars. The r... | 1510.01749v1 |
2016-04-23 | M(H) dependence and size distribution of SPIONs measured by atomic magnetometry | We demonstrate that the quasistatic recording of the magnetic excitation
function M(H) of superparamagnetic iron oxide magnetic nanoparticle (SPION)
suspensions by an atomic magnetometer allows a precise determination of the
sample's iron mass content mFe and the particle size distribution. | 1604.06882v1 |
2016-06-03 | Energy Losses of Magnetic Monopoles in Aluminum, Iron and Copper | The Energy Losses and Ranges of magnetic monopoles with magnetic charges
$1g_{D}$, $2g_{D}$, $3g_{D}$, $6g_{D}$ and $9g_{D}$ in Aluminum, Iron and in
Copper are computed, in the different regimes of velocities. The Restricted
Energy Losses of monopoles with magnetic charges $1g_{D}$, $2g_{D}$ and
$3g_{D}$ in Nuclear Tr... | 1606.01220v1 |
2022-10-11 | Oxygen and iron in interstellar dust: an X-ray investigation | Understanding the chemistry of the interstellar medium (ISM) is fundamental
for the comprehension of the Galactic and stellar evolution. X-rays provide an
excellent way to study the dust chemical composition and crystallinity along
different sight-lines in the Galaxy. In this work we study the dust grain
chemistry in t... | 2210.05778v1 |
2023-07-05 | Heterophased grain boundary-rich superparamagnetic Iron Oxides/carbon composite for Cationic and Anionic Dye Removal | Iron oxide-based nanostructures receive significant attention as an efficient
adsorbent for organic dyes removal. The removal properties have strong
dependency on the stoichiometry, phases, reactive edges, defect states etc
present in the iron-oxides nanostructures. Herein, iron oxide/carbon composite
with well-defined... | 2307.02142v1 |
2007-07-15 | Linear and nonlinear low frequency electrodynamics of the surface superconducting states in an yttrium hexaboride a single crystal | We report the low-frequency and tunneling studies of yttrium hexaboride
single crystal. Ac susceptibility at frequencies 10 - 1500 Hz has been measured
in parallel to the crystal surface DC felds, H0. We found that in the DC feld
H0 > Hc2 DC magnetic moment completely disappears while the ac response
exhibited the pres... | 0707.2211v1 |
2013-09-18 | The spin-state crossover and low-temperature magnetic state in yttrium doped Pr$_{0.7}$Ca$_{0.3}$CoO$_3$ | The structural and magnetic properties of two mixed-valence cobaltites with
formal population of 0.30 Co$^{4+}$ ions per f.u.,
(Pr$_{1-y}$Y$_{y}$)$_{0.7}$Ca$_{0.3}$CoO$_3$ ($y=0$ and 0.15), have been
studied down to very low temperatures by means of the high-resolution neutron
diffraction, SQUID magnetometry and heat c... | 1309.4812v1 |
2016-08-31 | Lattice instability and enhancement of superconductivity in YB$_6$ | The superconducting and normal state characteristics of yttrium hexaboride
(YB$_6$) have been investigated for the single crystals with a transition
temperatures $T_c$ ranging between 6 K and 7.6 K. The extracted set of
microscopic parameters [the coherence length $\xi$(0) $\sim$ 320$\div$340
${\AA}$, the penetration d... | 1608.08902v1 |
2019-08-05 | Anomalous high-temperature superconductivity in YH$_6$ | Pressure-stabilized hydrides are a new rapidly growing class of
high-temperature superconductors which is believed to be described within the
conventional phonon-mediated mechanism of coupling. Here we report the
synthesis of yttrium hexahydride Im3m-YH$_6$ that demonstrates the
superconducting transition with T$_c$ = ... | 1908.01534v2 |
2020-02-23 | Spectroscopy of YO from first principles | We report an ab initio study on the spectroscopy of the open-shell diatomic
molecule yttrium oxide, YO. The study considers the six lowest doublet states,
$X\,{}^{2}\Sigma^{+}$, $A\,{}^{2}\Pi$, $C\,{}^{2}\Pi$, $A'\,{}^{2}\Delta$,
$B\,{}^{2}\Sigma^{+}$, $D\,{}^{2}\Sigma^{+}$ and a few higher-lying quartet
states using h... | 2002.09994v1 |
2020-07-30 | Solid-state laser refrigeration of nanodiamond quantum sensors | The negatively-charged nitrogen vacancy (NV$^-$) centre in diamond is a
remarkable optical quantum sensor for a range of applications including,
nanoscale thermometry, magnetometry, single photon generation, quantum
computing, and communication. However, to date the performance of these
techniques using NV$^-$ centres ... | 2007.15247v1 |
2021-12-14 | Exploring yttrium doped C$_{24}$ fullerene as a high-capacity reversible hydrogen storage material: DFT investigations | By employing the state-of-the-art density functional theory, we report the
hydrogen storage capability of yttrium decorated C$_{24}$ fullerene. Single Y
atom attached on C$_{24}$ fullerene can reversibly adsorb a maximum number of 6
H$_2$ molecules with average adsorption energy -0.37 eV and average desorption
temperat... | 2112.07151v2 |
2023-09-04 | NLTE analysis for Y I and Y II in atmospheres of F-G-K stars | The non-local thermodynamical equilibrium (NLTE) line formation of Y I and Y
II is considered in 1D LTE model atmospheres of F-G-K-type stars. The model
atom was constructed with the most up-to-date atomic data, including quantum
cross sections and rate coefficients for transitions in inelastic collisions of
Y I and Y ... | 2309.01402v1 |
2023-10-13 | Compound-tunable embedding potential method to model local electronic excitations on $f$-element ions in solids: Pilot relativistic coupled cluster study of Ce and Th impurities in yttrium orthophosphate, YPO$_4$ | A method to simulate local properties and processes in crystals with
impurities via constructing cluster models within the frame of the
compound-tunable embedding potential (CTEP) and highly-accurate {\it ab initio}
relativistic molecular-type electronic structure calculations is developed and
applied to the Ce and Th-... | 2310.09240v2 |
2017-12-19 | Influence of gallium content on Ga3+ position and photo- and thermally stimulated luminescence in Ce3+ - doped multicomponent (Y,Lu,)3GaxAl5-xO12 garnets | Photoluminescence, thermally stimulated luminescence (TSL) and EPR
characteristics of the Ce3+ doped single crystals of multicomponent
Y1Lu2GaxAl5-xO12 and Lu3GaxAl5-xO12 garnets with different Ga contents (x = 0,
1, 2, 3, 4, 5) excited in the Ce3+ - related absorption bands are investigated
in the 9 - 500 K temperatur... | 1712.06925v1 |
2018-08-06 | Lithium Metal Penetration Induced by Electrodeposition through Solid Electrolytes: Example in Single-Crystal Li6La3ZrTaO12 Garnet | Solid electrolytes are considered a potentially enabling component in
rechargeable batteries that use lithium metal as the negative electrode, and
thereby can safely access higher energy density than available with today's
lithium ion batteries. To do so, the solid electrolyte must be able to suppress
morphological ins... | 1808.02105v1 |
2018-12-31 | Oxygen-vacancy centers in Y3Al5O12 garnet crystals: electron paramagnetic resonance and dielectric spectroscopy study | F+ center, an electron trapped at oxygen vacancy (VO), was investigated in
the oxygen deficient Y3Al5O12 (YAG) crystals by EPR. The measurements were
performed at temperatures 5-450 K and frequencies 9.4-350 GHz with using both
the continue wave and pulse EPR technique. The pulse electron-nuclear double
resonance was a... | 1812.11873v2 |
2022-01-23 | H$_2$O and CO$_2$ Surface Contamination of the Lithium-Stuffed Garnet | Understanding the reactivity of ubiquitous molecules on complex oxides has
broad impacts in energy applications and catalysis. The garnet-type
Li$_7$La$_3$Zr$_2$O$_{12}$ is a promising solid-state electrolyte for
lithium(Li)-ion batteries, and it readily reacts with H$_2$O and CO$_2$ when
exposed to ambient air. Such r... | 2201.09348v1 |
2023-03-03 | Comparative study of magnetocaloric properties for Gd$^{3+}$ compounds with different frustrated lattice geometries | As materials with suppressed ordering temperatures and enhanced ground state
entropies, frustrated magnetic oxides are ideal candidates for cryogenic
magnetocaloric refrigeration. While previous materials design has focused on
tuning the magnetic moments, their interactions, and density of moments on the
lattice, there... | 2303.01773v1 |
1995-10-04 | X-ray reflection in Galactic Black Hole Candidates: smeared edge profiles and resonant Auger destruction | We consider the spectra of Thomson-thick, geometrically-thin accretion discs
around Galactic black hole candidates in the reflection model and compute their
iron K edges and iron K$\alpha$ lines. We compare the smeared iron K edge
profiles that we compute with observation and find them to be a satisfactory
description ... | 9510022v1 |
1997-06-04 | The Galaxy Cluster Luminosity-Temperature Relationship and Iron Abundances - A Measure of Formation History ? | Both the X-ray luminosity-temperature (L-T) relationship and the iron
abundance distribution of galaxy clusters show intrinsic dispersion. Using a
large set of galaxy clusters with measured iron abundances we find a
correlation between abundance and the relative deviation of a cluster from the
mean L-T relationship. We... | 9706041v1 |
1997-11-28 | ICM masses in nearby and distant clusters of galaxies | We compile X-ray data of clusters of galaxies at a wide range of redshift
$z=0.0\sim1.0$ and compare X-ray luminosities, gas masses, iron abundances and
iron masses of nearby clusters and those of distant clusters as a function of
plasma temperature. All the date presented in this paper have been obtained
only with \AS... | 9711353v1 |
1999-06-16 | Iron line in the afterglow: a key to the progenitor | The discovery of a powerful and transient iron line feature in the X-ray
afterglow spectrum of GRB 970508 and GRB 970828, if confirmed, would be a major
breakthrough for understanding the nature the progenitor of gamma-ray bursts.
We show that a large mass of iron very close to the burster is necessary to
produce the e... | 9906268v1 |
1999-07-25 | Constraints on Type Ia Supernova Models from X-ray Spectra of Galaxy Clusters | We present constraints on theoretical models of Type Ia supernovae using
spatially resolved ASCA X-ray spectroscopy of three galaxy clusters: Abell 496,
Abell 2199 and Abell 3571. All three clusters have central iron abundance
enhancements; an ensemble of abundance ratios are used to show that most of the
iron in the c... | 9907343v1 |
1999-09-29 | Mass-radius relations for white dwarf stars of different internal compositions | The purpose of this work is to present accurate and detailed mass-radius
relations for white dwarf (WD) models with helium, carbon, oxygen, silicon and
iron cores, by using a fully updated stellar evolutionary code. We considered
masses from 0.15 to 0.5 Mo for the case of helium core, from 0.45 to 1.2 Mo for
carbon, ox... | 9909499v1 |
1999-10-08 | Iron line reverberation mapping with Constellation-X | The broad X-ray iron line seen in the spectra of many AGN is thought to
originate from the inner regions of the putative black hole accretion disk, and
hence provides a rare probe of that central region. In principle, future high
throughput X-ray spectrometers should be able to examine the temporal response
of this flu... | 9910168v1 |
2000-04-26 | Broad iron lines in Active Galactic Nuclei | An intrinsically narrow line emitted by an accretion disk around a black hole
appears broadened and skewed as a result of the Doppler effect and
gravitational redshift. The fluorescent iron line in the X-ray band at
6.4-6.9keV is the strongest such line and is seen in the X-ray spectrum of many
active galactic nuclei a... | 0004366v1 |
2000-06-23 | The iron abundance in hot central stars of planetary nebulae derived from IUE spectra | We present the first attempt to determine the iron abundance in hot central
stars of planetary nebulae. We perform an analysis with fully metal-line
blanketed NLTE model atmospheres for a sample of ten stars (T_eff >= 70.000 K)
for which high-resolution UV spectra are available from the IUE archive. In all
cases lines ... | 0006338v1 |
2001-04-04 | Iron line emission in X-ray afterglows | Recent observations of X-ray afterglows reveal the presence of a redshifted
Kalpha iron line in emission in four bursts. In GRB 991216, the line was
detected by the low energy grating of Chandra, which showed the line to be
broad, with a full width of ~15,000 km/s. These observations indicate the
presence of a >1 solar... | 0104086v1 |
2001-08-31 | The complex iron line of NGC 5506 | The bright Narrow Emission Line Galaxy, NGC 5506, has been observed
simultaneously by XMM-Newton and BeppoSAX. The iron line is complex, with at
least two components: one narrow and corresponding to neutral iron, the second
one broad and corresponding to ionized iron. The latter line is equally well
fitted by a truly b... | 0108508v1 |
2001-10-09 | The intracluster iron distribution around 4C+55.16 | We report on the metal distribution in the intracluster medium around the
radio galaxy 4C+55.16 (z=0.24) observed with the Chandra X-ray Observatory. The
radial metallicity profile shows a dramatic change at 10 arcsec (~50 kpc) in
radius from half solar to twice solar at inner radii. Also found was a
plume-like feature... | 0110216v1 |
2002-05-19 | Delayed Nickel Decay in Gamma Ray Bursts | Recently observed emission lines in the X-ray afterglow of gamma ray bursts
suggest that iron group elements are either produced in the gamma ray burst, or
are present nearby. If this material is the product of a thermonuclear burn,
then such material would be expected to be rich in Nickel-56. If the nickel
remains par... | 0205321v1 |
2002-05-21 | The complex iron line in NGC 7469 observed by BeppoSAX | In this letter we present analysis of BeppoSAX data from a long look at the
Seyfert 1 galaxy NGC 7469. The presence of a soft excess below 0.8 keV is
confirmed by our analysis and no warm absorber component is required to fit the
spectrum. A complex iron emission line and the Compton reflection hump are
clearly detecte... | 0205347v1 |
2002-09-19 | Cosmic Needles versus Cosmic Microwave Background Radiation | It has been suggested by a number of authors that the 2.7K cosmic microwave
background (CMB) radiation might have arisen from the radiation from Population
III objects thermalized by conducting cosmic graphite/iron needle-shaped dust.
Due to lack of an accurate solution to the absorption properties of exceedingly
elong... | 0209386v1 |
2002-11-18 | XMM-Newton Observations of AGN Iron Line Profiles | XMM-Newton observations of type I AGN are presented. The properties of the
iron K emission line are reviewed, the majority of AGN observed by XMM-Newton
show narrow, unresolved (by XMM) iron lines at 6.4 keV from cold matter that
must originate far from the inner accretion disc, perhaps in the putative torus
or outer b... | 0211381v1 |
2003-07-08 | The origin of the iron lines in NGC 7213 | The analysis of a simultaneous XMM-Newton/BeppoSAX plus three previous
BeppoSAX observations revealed that NGC 7213 is a rather peculiar Seyfert 1. No
significant Compton reflection component was observed, while an iron line
complex, best explained in terms of three narrow lines, is clearly apparent in
the data. Due to... | 0307143v1 |
2003-07-09 | The lack of variability of the iron line in MCG-6-30-15: general relativistic effects | The spectrum and variability of the Seyfert galaxy MCG-6-30-15 can be
decomposed into two apparently disconnected components: a highly variable power
law and an almost constant component which contains a broad and strong iron
line. We explore a possible explanation of the puzzling lack of variability of
the iron line, ... | 0307163v1 |
2003-11-13 | The reprocessing features in the X-ray spectrum of the NELG MCG-5-23-16 | We present results from the spectral analysis of the Seyfert 1.9 galaxy
MCG-5-23-16, based on ASCA, BeppoSAX, Chandra and XMM-Newton observations. The
spectrum of this object shows a complex iron Kalpha emission line, which is
best modeled by a superposition of a narrow and a broad (possibly relativistic)
iron line, to... | 0311316v1 |
2003-11-27 | The Iron Unresolved Transition Array in Active Galactic Nuclei | The unresolved transition array (UTA) of iron M-shell ions is a prominent
absorption feature in the X-ray spectrum of many active galactic nuclei (AGNs).
Modeling photoionized plasmas in attempt to match the observed silicon and
oxygen lines fail to predict the level of ionization of iron as inferred by
this feature. I... | 0311604v1 |
2004-03-10 | Handling of Atomic Data | State-of-the-art NLTE model-atmosphere codes have arrived at a high level of
numerical sophistication and are now useful tools to analyze high-quality
spectra from the infrared to the X-ray wavelength range. The capacity of
current computers permit calculations which include line spectra from all
elements from hydrogen... | 0403239v1 |
2004-03-19 | Extragalactic UHE proton spectrum and prediction for iron-nuclei flux at 10^8 - 10^9 GeV | We investigate the problem of transition from Galactic cosmic rays to
extragalactic ultra high energy cosmic rays. Using the model for extragalactic
ultra high energy cosmic rays and observed all-particle cosmic ray spectrum, we
calculate the galactic spectrum of iron nuclei in the energy range $10^8 -
10^9$ GeV. The f... | 0403477v2 |
2004-04-15 | X-ray reprocessing in Seyfert Galaxies: simultaneous XMM-Newton/BeppoSAX observations | We selected a sample of eight bright unobscured (at least at the iron line
energy) Seyfert Galaxies observed simultaneously by XMM-Newton and BeppoSAX,
taking advantage of the complementary characteristics of the two missions. The
main results of our analysis can be summarized as follows: narrow neutral iron
lines are ... | 0404308v1 |
2004-10-23 | Why the Model of a Hydrogen-Filled Sun Is Obsolete | Isotope analyses on meteorites, planets, lunar samples, the solar wind, and
solar flares show that heterogeneous debris of a supernova (SN) that exploded
here 5 Gy ago formed the solar system. The Sun formed on the collapsed SN core.
Iron meteorites and the iron cores of the terrestrial planets formed out of
iron-rich ... | 0410569v1 |
2004-11-22 | The influence of chemical composition on the properties of Cepheid stars I - Period-Luminosity relation vs iron abundance | We have assessed the influence of the stellar iron content on the Cepheid
Period-Luminosity (PL) relation by relating the V band residuals from the
Freedman et al (2001) PL relation to [Fe/H] for 37 Galactic and Magellanic
Clouds Cepheids. The iron abundances were measured from FEROS and UVES
high-resolution and high-s... | 0411594v2 |
2005-01-25 | The Iron Line Background | We investigate the presence of iron line emission among faint X-ray sources
identified in the 1Ms Chandra Deep Field South and in the 2Ms Chandra Deep
Field North. Individual source spectra are stacked in seven redshift bins over
the range z=0.5-4. We find that iron line emission is an ubiquitous property of
X-ray sour... | 0501542v1 |
2005-10-20 | Truncated disc versus extremely broad iron line in XTE J1650-500 | There is growing evidence from both spectral and timing properties that there
is a truncated inner accretion disc in low mass accretion rate Galactic black
hole systems. The detection of extremely smeared relativistic iron lines in
some of these systems is the only current piece of evidence which conflicts
with this ge... | 0510614v2 |
2006-03-06 | Relativistic Iron lines at high redshifts | The shape and the intensity of the 6.4 keV iron line bring unique information
on the geometrical and physical properties of the supermassive black hole and
the surrounding accreting gas at the very center of Active Galactic Nuclei.
While there are convincing evidences of a relativistically broadened iron line
in a few ... | 0603139v1 |
2006-08-24 | Non-LTE modeling of supernova-fallback disks | We present a first detailed spectrum synthesis calculation of a
supernova-fallback disk composed of iron. We assume a geometrically thin disk
with a radial structure described by the classical alpha-disk model. The disk
is represented by concentric rings radiating as plane-parallel slabs. The
vertical structure and emi... | 0608529v1 |
2006-09-15 | A Short Review of Relativistic Iron Lines from Stellar-Mass Black Holes | In this contribution, I briefly review recent progress in detecting and
measuring the properties of relativistic iron lines observed in stellar-mass
black hole systems, and the aspects of these lines that are most relevant to
studies of similar lines in Seyfert-1 AGN. In particular, the lines observed in
stellar-mass b... | 0609447v1 |
2006-11-14 | Chandra Detection of Fe XVII in Absorption: Iron Abundance in the Hot Gaseous Interstellar Medium | The iron depletion level and the gas-phase iron abundance in the hot ~10^6 K
interstellar medium (ISM) is critical to the understanding of its energy
balance as well as the thermal sputtering, cooling, and heating processes of
dust grains. Here we report on the first detection of the Fe XVII absorption
line at 15.02 A ... | 0611446v2 |
2006-11-21 | Discovery of Variable Iron Fluorescence from Reflection Nebulae in the Galactic Center | Based on three years of deep observations of the Galactic center with the
Chandra X-ray Observatory, we report the discovery of changes in the
intensities and morphologies of two hard X-ray nebulosities. The nebulosities
are dominated by fluorescent iron emission, and are coincident with molecular
clouds. The morpholog... | 0611651v1 |
2007-01-17 | Galactic Basins of Helium and Iron around the Knee Energy | The differential energy spectrum of cosmic rays exhibits a change of slope,
called "knee" of the spectrum, around the nominal energy of 3 x 10^15 eV, and
individual "knees" for single ions, at different energies. The present work
reports a detailed account of the characteristics and the origin of the knees
for Helium a... | 0701498v1 |
1999-05-21 | Structure and Dynamics of Liquid Iron under Earth's Core Conditions | First-principles molecular dynamics simulations based on density-functional
theory and the projector augmented wave (PAW) technique have been used to study
the structural and dynamical properties of liquid iron under Earth's core
conditions. As evidence for the accuracy of the techniques, we present PAW
results for a r... | 9905319v1 |
2001-05-11 | Magnetization Process of Nanoscale Iron Cluster | Low-temperature magnetization process of the nanoscale iron cluster in
linearly sweeped fields is investigated by a numerical analysis of
time-dependent Schr$\ddot{\rm o}$dinger equation and the quantum master
equation. We introduce an effective basis method extracting important states,
by which we can obtain the magne... | 0105227v1 |
2001-11-26 | Evidence of local magnetic order in hcp iron from Raman mode splitting | Experimental measurements of Raman spectra for hcp iron at high pressure show
two modes over a considerable pressure range in contrast to the prediction of
one doubly degenerate mode for the hcp lattice. We use density functional
theory to investigate the influence of magnetic order on the Raman active modes
of hcp iro... | 0111487v1 |
2003-10-22 | Unconventional superconductivity and normal state properties of epsilon-iron at high pressure | Following the discovery of superconductivity in epsilon-iron, subsequent
experiments hinted at non-Fermi liquid behaviour of the normal phase and
sensitive dependence of the superconducting state on disorder, both signatures
of unconventional pairing. We report further resistive measurements under
pressure of samples o... | 0310519v1 |
2004-05-19 | Dynamics of the magnetic and structural a -> e phase transition in Iron | We have studied the high-pressure iron bcc to hcp phase transition by
simultaneous X-ray Magnetic Circular Dichroism (XMCD) and X-ray Absorption
Spectroscopy (XAS) with an X-ray dispersive spectrometer. The combination of
the two techniques allows us to obtain simultaneously information on both the
structure and the ma... | 0405439v4 |
2005-01-17 | Electronic structure of nanoscale iron oxide particles measured by scanning tunneling and photoelectron spectroscopies | We have investigated the electronic structure of nano-sized iron oxide by
scanning tunnelling microscopy (STM) and spectroscopy (STS) as well as by
photoelectron spectroscopy. Nano particles were produced by thermal treatment
of Ferritin molecules containing a self-assembled core of iron oxide. Depending
on the thermal... | 0501377v1 |
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