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2024-02-06 | Magnon mediated spin pumping by coupled ferrimagnetic garnets heterostructure | Spin pumping has significant implications for spintronics, providing a
mechanism to manipulate and transport spins for information processing.
Understanding and harnessing spin currents through spin pumping is critical for
the development of efficient spintronic devices. The use of a magnetic
insulator with low damping... | 2402.03734v1 |
2024-03-04 | Double magnetic transition, complex field-induced phases, and large magnetocaloric effect in the frustrated garnet compound Mn$_{3}$Cr$_{2}$Ge$_{3}$O$_{12}$ | A detailed study of the magnetic and magnetocaloric properties of a garnet
compound Mn$_{3}$Cr$_{2}$Ge$_{3}$O$_{12}$ is carried out using x-ray
diffraction, magnetization, heat capacity, and neutron diffraction measurements
as well as \textit{ab initio} band-structure calculations. This compound
manifests two successiv... | 2403.02082v2 |
2024-03-22 | UV- and X-ray-activated broadband NIR garnet-type Ca3Ga2Sn3O12:Fe3+ phosphors with efficient persistent luminescence | Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are
compact light sources of great interest for NIR spectroscopy applications.
Beyond typical Cr3+-activated NIR-emitting phosphors, there exists a strong
demand for Cr3+-free alternatives with high efficiency and broadband emission
to rich the landsc... | 2403.15168v1 |
2001-04-19 | An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zw 1 | We present an empirical template spectrum suitable for fitting/subtracting
and studying the FeII and FeIII line emission in the restframe UV spectra of
active galatic nuclei (AGNs), the first empirical UV iron template to cover the
full 1250 - 3090 A range. Iron emission is often a severe contaminant in
optical--UV spe... | 0104320v1 |
2008-10-01 | Galactic abundance gradients from Cepheids : On the iron abundance gradient around 10-12 kpc | Context: Classical Cepheids can be adopted to trace the chemical evolution of
the Galactic disk since their distances can be estimated with very high
accuracy. Aims: Homogeneous iron abundance measurements for 33 Galactic
Cepheids located in the outer disk together with accurate distance
determinations based on near-in... | 0810.0205v1 |
2011-11-09 | Galactic restrictions on iron production by various Types of supernovae | We propose a statistical method for decomposition of contributions to iron
production from various sources: supernovae Type II and the subpopulations of
supernovae Type Ia -- prompt (their progenitors are short-lived stars of ages
less then $\sim$100 Myr) and tardy (whose progenitors are long-lived stars of
ages $>$100... | 1111.2152v1 |
2018-08-27 | Why Are Some Gamma-Ray Bursts Hosted by Oxygen-rich Galaxies? | Theoretically long gamma-ray bursts (GRBs) are expected to happen in
low-metallicity environments, because in a single massive star scenario, low
iron abundance prevents loss of angular momentum through stellar wind,
resulting in ultra-relativistic jets and the burst. In this sense, not just a
simple metallicity measur... | 1808.08969v1 |
2021-03-25 | Thermodynamic Analysis of Titanium Removal from Molten iron Smelted with Large Amounts of Sodium Additives | High purity iron is obtained from vanadium-titanium magnetite (VTM) by
one-step coal-based direct reduction-smelting process with coal as reductant
and sodium carbonate (Na2CO3) as additives. Industrial experiments show that
the process of treating molten iron with a large amount of Na2CO3 is effective
in removing tita... | 2103.13572v1 |
2021-08-17 | Nigral diffusivity, but not free water, correlates with iron content in Parkinson's disease | The loss of melanized neurons in the substantia nigra pars compacta is a
primary feature in Parkinson's disease (PD). Iron deposition occurs in
conjunction with this loss. Loss of nigral neurons should remove barriers for
diffusion and increase diffusivity of water molecules in regions undergoing
this loss. In metrics ... | 2108.07864v1 |
2024-01-30 | Carrier-phase DNS of ignition and combustion of iron particles in a turbulent mixing layer | Three-dimensional CP-DNS of reacting iron particle dust clouds in a turbulent
mixing layer are conducted. The simulation approach considers the Eulerian
transport equations for the reacting gas phase and resolves all scales of
turbulence, whereas the particle boundary layers are modelled employing the
Lagrangian point-... | 2401.16944v1 |
1998-09-10 | Abundances of UV bright stars in globular clusters. I. ROA 5701 in omega Centauri and Barnard 29 in M 13 | Two UV brights stars in globular clusters, ROA 5701 (omega Cen) and Barnard
29 (M 13) are analysed from high-resolution UV and optical spectra. The main
aim is the measurement of iron abundances from UV spectra obtained with the
HST-GHRS. In addition atmospheric parameters and abundances for He, C, N, O,
and Si are der... | 9809128v1 |
2002-02-05 | Iron Features in the XMM-Newton spectrum of NGC 4151 | We present a detailed analysis of the hard X-ray (>2.5 keV) EPIC spectra from
the first observations of NGC 4151 made by XMM-Newton. We fit the spectra with
a model consisting of a power-law continuum modified by line-of-sight
absorption (arising in both partially photoionized and neutral gas) plus
additional iron-K em... | 0202093v1 |
2004-04-21 | Ultra-Low Iron Abundances in Distant Hot Gas in Galaxy Groups | A new XMM observation of the outer regions of the galaxy group NGC 5044
indicates hot gas iron abundances of only ~0.15 solar between r=0.2 - 0.4
r_vir. While the total baryon mass within the virial radius may be close to the
cosmic mean value observed in rich clusters, the ratio of total iron mass to
optical light in ... | 0404430v1 |
2004-12-28 | Model atmospheres and X-ray spectra of iron-rich bursting neutron stars. II. Iron rich Comptonized Spectra | This paper presents the set of plane-parallel model atmosphere equations for
a very hot neutron star (X-ray burst source). The model equations assume both
hydrostatic and radiative equilibrium, and the equation of state of an ideal
gas in local thermodynamic equilibrium (LTE). The equation of radiative
transfer include... | 0412644v1 |
2005-08-24 | Iron Fluorescent Line Emission from Black Hole Accretion Disks with Magnetic Reconnection-Heated Corona | We investigate the iron K$\alpha$ fluorescent line produced by hard X-ray
photons from magnetic reconnection-heated corona. The hot corona with
temperature being about $10^9$K can irradiate the underlying disk with a
continuum X-ray spectrum produced via thermal Comptonization. Then the iron
atoms in the disk photoelec... | 0508507v1 |
2008-04-15 | UV and FUV spectroscopy of the hybrid PG 1159-type central star NGC 7094 | Previous studies aiming at the iron-abundance determination in three PG 1159
stars (K 1-16, PG 1159-035, NGC 7094) and a [WC]-PG 1159 transition star (Abell
78) have revealed that no object shows any iron line in the UV spectrum. The
stars are iron-deficient by at least 1 dex, typically. A possible explanation
is that ... | 0804.2372v1 |
2013-06-07 | Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors | The bad metal behavior in the normal state of the iron-based superconductors
suggests an intimate connection between the superconductivity and a proximity
to a Mott transition. At the same time, there is strong evidence for the
multi-orbital nature of the electronic excitations. It is then important to
understand the o... | 1306.1697v1 |
2013-06-18 | Magnetic anisotropy and lattice dynamics in FeAs studied by Mössbauer spectroscopy | Iron mono-arsenide in the powder form has been investigated by transmission
57Fe Moessbauer spectroscopy in the temperature range 4.2 - 1000 K. Additional
spectra have been obtained at 20 K and 100 K applying external magnetic field
of 7 T. It was found that the spin spiral propagating along the c-axis leads to
the com... | 1306.4170v3 |
2014-06-22 | Using iron line reverberation and spectroscopy to distinguish Kerr and non-Kerr black holes | The iron K$\alpha$ line commonly observed in the X-ray spectrum of both
stellar-mass and supermassive black hole candidates is produced by the
illumination of a cold accretion disk by a hot corona. In this framework, the
activation of a new flaring region in the hot corona imprints a time variation
on the iron line spe... | 1406.5677v3 |
2014-10-01 | Millihertz quasi-periodic oscillations and broad iron line from LMC X-1 | We study the temporal and energy spectral characteristics of the persistent
black hole X-ray binary LMC X-1 using two XMM-Newton and a Suzaku observation.
We report the discovery of low frequency (~ 26-29 mHz) quasi-periodic
oscillations (QPOs). We also report the variablity of the broad iron K-alpha
line studied earli... | 1410.0135v2 |
2014-11-08 | Melting of iron close to Earth's inner core boundary conditions and beyond | Several important geophysical features such as heat flux at the Core-Mantle
Boundary or geodynamo production are intimately related with the temperature
profile in the Earth's core. However, measuring the melting curve of iron at
conditions corresponding to the Earth inner core boundary under pressure of 330
GPa has el... | 1411.2074v1 |
2015-07-06 | Unconventional superconductivity in the layered iron germanide YFe$_2$Ge$_2$ | Since the discovery of superconductivity in LaFePO in 2006, numerous
iron-based superconductors have been identified within diverse structure
families, all of which combine iron with a group-V (pnictogen) or group-VI
(chalco- gen) element. Unconventional superconductivity is extremely rare among
transition metal compou... | 1507.01436v2 |
2015-09-15 | Search for New Superconductors: An Electro-Magnetic Phase Transition in an Iron Meteorite Inclusion at 117 K | The discovery of superconductivity in pnictides and iron chalcogenides
inspires the search for new iron based superconducting phases. Iron-rich
meteorites present a unique opportunity for this search, because they contain a
broad range of compounds produced under extreme growth conditions. We
investigated a natural iro... | 1509.04452v2 |
2017-04-04 | Iron Partitioning between Ferropericlase and Bridgmanite in the Earth's Lower Mantle | Earth's lower mantle is generally believed to be seismically and chemically
homogeneous because most of the key seismic parameters can be explained using a
simplified mineralogical model at expected press-temperature conditions.
However, recent high-resolution tomographic images have revealed seismic and
chemical strat... | 1704.01140v1 |
2018-03-05 | Iron and silicate dust growth in the Galactic interstellar medium: clues from element depletions | The interstellar abundances of refractory elements indicate a substantial
depletion from the gas phase, that increases with gas density. Our recent model
of dust evolution, based on hydrodynamic simulations of the lifecycle of giant
molecular clouds (GMCs) proves that the observed trend for [Si$_{gas}$/H] is
driven by ... | 1803.01929v2 |
2018-08-31 | Insight of the thermal conductivity of $ε-$iron at Earth's core conditions from the newly developed direct $ab~initio$ methodology | The electronic thermal conductivity of iron at Earth's core conditions is an
extremely important physical property in geophysics field. However, the exact
value of electronic thermal conductivity of iron under extreme pressure and
temperature still remains poorly known both experimentally and theoretically. A
few recen... | 1808.10860v1 |
2019-06-05 | Small Planets in the Galactic Context: Host Star Kinematics, Iron, and $α$ Element Enhancement | We explored the occurrence rate of small close-in planets among
$\textit{Kepler}$ target stars as a function of the iron abundance and the
stellar total velocity $V_\mathrm{tot}$. We estimated the occurrence rate of
those planets by combining information from LAMOST and the
California-$\textit{Kepler}$ Survey (CKS) and... | 1906.01982v2 |
2020-06-02 | Study of iron complexes in visceral organs and brain from a ${}^57$Fe enriched $β$-thalassaemia mouse model via Mössbauer Spectroscopy | The hearts, kidneys, livers, spleens and brains of ${}^57$Fe enriched
wild-type and heterozygous $\beta$-thalassaemic mice at 1, 3, 6 and 9 months of
age were studied by means of M\"ossbauer Spectroscopy at 80K. Ferritin-like
iron depositions in the heart and the brain of the thalassaemic mice were found
to be slightly... | 2006.01511v1 |
2021-03-05 | Ferromagnetic Composite Self-Arrangement in Iron-Implanted Epitaxial Palladium Thin Films | We report on the formation of the dilute $Pd_{1-x}Fe_x$ compositions with
tunable magnetic properties under an ion-beam implantation of epitaxial Pd thin
films. Binary $Pd_{1-x}Fe_x$ alloys with a mean iron content $x$ of $0.025$,
$0.035$ or $0.075$ were obtained by the implantation of $40 keV$ $Fe^+$ ions
into the pal... | 2103.03562v1 |
2021-09-30 | Nucleosynthetic Pt isotope anomalies and the Hf-W chronology of core formation in inner and outer solar system planetesimals | The 182Hf-182W chronology of iron meteorites provides crucial information on
the timescales of accretion and differentiation of some of the oldest
planetesimals of the Solar System. Determining accurate Hf-W model ages of iron
meteorites requires correction for cosmic ray expo-sure (CRE) induced
modifications of W isot... | 2109.15250v1 |
2021-10-01 | Q-Net: A Quantitative Susceptibility Mapping-based Deep Neural Network for Differential Diagnosis of Brain Iron Deposition in Hemochromatosis | Brain iron deposition, in particular deep gray matter nuclei, increases with
advancing age. Hereditary Hemochromatosis (HH) is the most common inherited
disorder of systemic iron excess in Europeans and recent studies claimed high
brain iron accumulation in patient with Hemochromatosis. In this study, we
focus on Artif... | 2110.00203v1 |
2021-10-12 | Earth's accretion inferred from iron isotopic anomalies of supernova nuclear statistical equilibrium origin | Nucleosynthetic Fe isotopic anomalies in meteorites may be used to
reconstruct the early dynamical evolution of the solar system and to identify
the origin and nature of the material that built planets. Using high-precision
iron isotopic data of 23 iron meteorites from nine major chemical groups we
show that all iron m... | 2110.06045v1 |
2022-01-23 | Large Impacts onto the Early Earth: Planetary Sterilization and Iron Delivery | Late accretion onto the Hadean Earth included large impacts that could have
influenced early habitability, either by sterilizing the planet or
alternatively catalyzing the origin of life by delivering iron required to
create a reducing environment/atmosphere. We present 3D numerical simulations
of 1500-3400 km diameter... | 2201.09349v1 |
2022-04-10 | Effect of iron vacancies on the magnetic order and spin dynamics of the spin ladder BaFe$_{2-δ}$S$_{1.5}$Se$_{1.5}$ | Quasi-one-dimensional iron chalcogenides possess various magnetic states
depending on the lattice distortion, electronic correlations, and presence of
defects. We present neutron diffraction and inelastic neutron scattering
experiments on the spin ladder compound BaFe$_{2-\delta}$S$_{1.5}$Se$_{1.5}$
with $\sim$6% iron ... | 2204.04697v1 |
2022-04-20 | Experimental Simulations of Shock Textures in BCC Iron: Implications for Iron Meteorites | Neumann band in iron meteorites, which is deformation twins in kamacite
(Fe-Ni alloy), has been known to be a characteristic texture indicating ancient
collisions on parent bodies of meteorites. We conducted a series of shock
recovery experiments on bcc iron with the projectile velocity at 1.5 km/sec at
various initial... | 2204.09195v1 |
2022-09-11 | Correlation-corrected band topology and topological surface states in iron-based superconductors | Iron-based superconductors offer an ideal platform for studying topological
superconductivity and Majorana fermions. In this paper, we carry out a
comprehensive study of the band topology and topological surface states of a
number of iron-based superconductors using a combination of density functional
theory (DFT) and ... | 2209.04776v1 |
2023-04-26 | Assessment of sol-gel derived iron oxide substituted 45S5 bioglass-ceramics for biomedical applications | Magnetic bioactive glass ceramic (MGC) powders have been synthesized by sol
gel route by systematically substituting silicon dioxide with iron oxide in the
45S5 glass composition. Powder x-ray diffraction studies revealed a variation
in the percentage of combeite (Ca$_2$Na$_2$Si$_3$O$_9$), magnetite
(Fe$_3$O$_4$), and ... | 2304.13437v1 |
2023-11-02 | Studying the variability of fluorescence emission and the presence of clumpy wind in HMXB GX 301$-$2 using XMM-Newton | We present the results from an analysis of data from an \textit{XMM-Newton}
observation of the accreting high mass X-ray binary pulsar GX 301$-$2. Spectral
analysis in the non-flaring segment of the observation revealed that the
equivalent width of the iron fluorescence emission is correlated with the
observed absorpti... | 2311.01176v1 |
2019-01-15 | Dust-depletion sequences in damped Ly-α absorbers II. The composition of cosmic dust, from low-metallicity systems to the Galaxy | We aim at assessing what are the most dominant dust species or types,
including silicate and iron oxide grains present in the ISM, by using recent
observations of dust depletion of galaxies at various evolutionary stages. We
use the observed elemental abundances in dust of several metals (O, S, Si, Mg,
and Fe) in diffe... | 1901.04710v3 |
2023-04-28 | A comparison of mechanistic models for the combustion of iron microparticles and their application to polydisperse iron-air suspensions | Metals can serve as carbon-free energy carriers, e. g. in innovative
metal-metal oxide cycles as proposed by Bergthorson (Prog. Energy Combust.
Sci., 2018). Iron powder is a suitable candidate since it can be oxidized with
air. Nevertheless, the combustion of iron powder in air is challenging
especially with respect to... | 2304.14927v2 |
1994-10-05 | Influence of Cooling Flow and Galactic Motion on the Iron Distribution in Clusters of Galaxies | Iron abundance distribution is now known for 12 clusters of galaxies. For
some clusters (e.g. Centaurus) the observed abundance increases toward the
cluster center, while for the others (e.g. Coma and Hydra-A) no significant
inhomogeneity was observed. In order to understand this difference, we
investigate the influenc... | 9410014v1 |
1999-11-19 | Evolution of iron core white dwarfs | Recent measurements made by Hipparcos (Provencal et al. 1998) present
observational evidence supporting the existence of some white dwarf (WD) stars
with iron - rich, core composition. In this connection, the present paper is
aimed at exploring the structure and evolution of iron - core WDs by means of a
detailed and u... | 9911371v1 |
1999-11-19 | Gas, Iron and Gravitational Mass in Galaxy Clusters: The General Lack of Cluster Evolution at z < 1.0 | We have analyzed the ASCA data of 29 nearby clusters of galaxies
systematically, and obtained temperatures, iron abundances, and X-ray
luminosities of their intracluster medium (ICM). We also estimate ICM mass
using the beta model, and then evaluate iron mass contained in the ICM and
derive the total gravitating mass. ... | 9911388v1 |
1999-12-15 | On the influence of resonant absorption on the iron emission line profiles from accreting black holes | The fluorescent iron K$\alpha$ emission line profile provides an excellent
probe of the innermost regions of active galactic nuclei. Fe XXV and Fe XXVI in
diffuse plasma above the accretion disc can affect the X-ray spectrum by iron
K$\alpha$ resonant absorption. This in turn can influence the interpretation of
the dat... | 9912321v1 |
2000-02-17 | The Iron Project | Recent advances in theoretical atomic physics have enabled large-scale
calculation of atomic parameters for a variety of atomic processes with high
degree of precision. The development and application of these methods is the
aim of the Iron Project. At present the primary focus is on collisional
processes for all ions ... | 0002356v1 |
2000-09-29 | X-ray iron line variability: constraints on the inner accretion disk | After reviewing the basic physics of X-ray reflection in AGN, we present
three case studies which illustrate the current state of X-ray reflection
studies. For the low-luminosity AGN NGC4258, we find that the iron line is much
narrower than is typically found in higher luminosity AGN. We argue that this
is evidence for... | 0009503v1 |
2001-06-27 | An Empirical Ultraviolet Iron Spectrum Template Applicable to Active Galaxies | Iron emission is often a severe contaminant in optical-ultraviolet spectra of
active galaxies. Its presence complicates emission line studies. A viable
solution, already successfully applied at optical wavelengths, is to use an
empirical iron emission template. We have generated FeII and FeIII templates
for ultraviolet... | 0106510v1 |
2002-02-01 | Temperature Scale and Iron Abundances of Very Hot Central Stars of Planetary Nebulae | The determination of effective temperatures of very hot central stars
(Teff>70000K) by model atmosphere analyses of optical H and He line profiles is
afflicted with considerable uncertainty, primarily due to the lack of neutral
helium lines. Ionization balances of metals, accessible only with UV lines,
allow more preci... | 0202012v1 |
2002-03-14 | Cerenkov Line Emission as a Possible Mechanism of X-ray Lines in Gamma-ray Bursts | The recent discoveries of X-ray lines in the afterglows of gamma-ray bursts
(GRBs) provide significant clues to the nature of GRB progenitors and central
environments. However, the iron line interpretation by fluorescence or
recombination mechanism requires a large amount of iron material. We argue that
the very strong... | 0203222v2 |
2003-05-13 | Iron and Nickel properties in the X-ray reflecting region of the Circinus Galaxy | We discuss the iron and nickel properties in the nuclear X-ray reflecting
region of the Circinus Galaxy, studied with XMM-Newton. The main results are:
a) from the depth of the Fe Kalpha edge, a value of A_Fe=1.7 in number with
respect to the cosmic value (as for Anders & Grevesse 1989) is measured, if the
(not directl... | 0305217v1 |
2003-06-25 | Iron K features in the hard X-ray XMM-Newton spectrum of NGC 4151 | Recent XMM-Newton observations have measured the hard (2.5-12 keV) X-ray
spectrum of the well-known Seyfert galaxy NGC 4151 with a signal-to-noise
unprecedented for this source. We find that a spectral model, developed to fit
previous Beppo-SAX and ASCA observations of NGC 4151, provides an excellent
description of the... | 0306540v1 |
2003-08-11 | Theoretical UBVRI colors of iron core white dwarfs | We explore photometric properties of hypothetical iron core white dwarfs and
compute their expected colors in UBVRI Johnson broadband system. Atmospheres of
iron core WDs in this paper consist of pure iron covered by a pure hydrogen
layer of an arbitrary column mass. LTE model atmospheres and theoretical
spectra are ca... | 0308184v2 |
2006-09-12 | Discoveries of Diffuse Iron Line Sources from the Sgr B Region | The radio complex Sgr B region is observed with the X-Ray Imaging
Spectrometers (XIS) on board Suzaku. This region exhibits diffuse iron lines at
6.4, 6.7 and 6.9 keV, which are K$\alpha$ lines of Fe \emissiontype{I} (neutral
iron), Fe\emissiontype{XXV} (He-like iron) and Fe\emissiontype{XXVI} (H-like
iron), respective... | 0609310v1 |
2006-07-08 | Magnetic Magnetoelectric and Magnetoelastic Properties of new multiferroic material NdFe3(BO3)4 | Complex experimental and theoretical study of the magnetic, magnetoelectric,
and magnetoelastic properties of neodymium iron borate NdFe3(BO3)4 along
various crystallographic directions have been carried out in strong pulsed
magnetic fields up to 230 kOe in a temperature range of 4.2-50 K. It has been
found that neodym... | 0607217v1 |
2005-09-14 | Role of proton irradiation and relative air humidity on iron corrosion | This paper presents a study of the effects of proton irradiation on iron
corrosion. Since it is known that in humid atmospheres, iron corrosion is
enhanced by the double influence of air and humidity, we studied the iron
corrosion under irradiation with a 45% relative humidity. Three proton beam
intensities (5, 10 and ... | 0509116v1 |
2005-09-14 | Origin of the hydrogen involved in iron corrosion under irradiation | In the perspective of long term geological storage, high level nuclear wastes
will be overpacked in low carbon steel containers. In that context, we have
studied the influence of oxygen dissolved in water on iron corrosion.
Therefore, leaching experiments were performed in desaerated D$\_2$O and in
aerated H$\_2$O and ... | 0509117v1 |
2005-09-14 | Use ion beam techniques to study the coupling between air and its relative humidity on iron corrosion under irradiation | In this paper, the role of air humidity on the iron corrosion under
irradiation is studied in the context of geological disposal of nuclear wastes.
The irradiation experiments are performed at room temperature using a 3 MeV
extracted proton beam with a 10 nA intensity. Different atmospheres are
studied: Humid air with ... | 0509120v1 |
2007-10-25 | Nuclear PDFs from neutrino deep inelastic scattering | We study nuclear effects in charged current deep inelastic neutrino-iron
scattering in the frame-work of a chi^2 analysis of parton distribution
functions. We extract a set of iron PDFs and show that under reasonable
assumptions it is possible to constrain the valence, light sea and strange
quark distributions. Our iro... | 0710.4897v2 |
2007-10-25 | Topology of the Spin-polarized Charge Density in bcc and fcc Iron | We investigate the topology of the spin-polarized charge density in bcc and
fcc iron. While the total spin-density is found to possess the topology of the
non-magnetic prototypical structures, in some cases the spin-polarized
densities are characterized by unique topologies; for example, the
spin-polarized charge densi... | 0710.4942v2 |
2007-11-19 | XMM-Newton and Broad Iron Lines | Iron line emission is common in the X-ray spectra of accreting black holes.
When the line emission is broad or variable then it is likely to originate from
close to the black hole. X-ray irradiation of the accretion flow by the
power-law X-ray continuum produces the X-ray 'reflection' spectrum which
includes the iron l... | 0711.2976v1 |
2008-03-26 | Supernova progenitors and iron density evolution from SN rate evolution measurements | Using an extensive compilation of literature supernova rate data we study to
which extent its evolution constrains the star formation history, the
distribution of the type Ia supernova (SNIa) progenitor's lifetime, the mass
range of core-collapse supernova (CCSN) progenitors, and the evolution of the
iron density in th... | 0803.3793v2 |
2008-07-01 | Light matter in the core of the Earth: its identity, quantity and temperature using tricritical phenomena | Light elements in the iron-rich core of the Earth are important indicators
for the evolution of our planet. Their amount and distribution, and the
temperature in the core, are essential for understanding how the core and the
mantle interact and for modelling the geodynamo which generates the planetary
magnetic field. H... | 0807.0187v1 |
2008-08-15 | Relativistic Iron Line Emission from the Neutron Star Low-mass X-ray Binary 4U 1636-536 | We present an analysis of XMM-Newton and RXTE data from three observations of
the neutron star LMXB 4U 1636-536. The X-ray spectra show clear evidence of a
broad, asymmetric iron emission line extending over the energy range 4-9 keV.
The line profile is consistent with relativistically broadened Fe K-alpha
emission fro... | 0808.2214v2 |
2009-02-11 | Temperature of the inner-core boundary of the Earth: Melting of iron at high pressure from first-principles coexistence simulations | The Earth's core consists of a solid ball with a radius of 1221 Km,
surrounded by a liquid shell which extends up to 3480 Km from the centre of the
planet, roughly half way towards the surface (the mean radius of the Earth is
6373 km). The main constituent of the core is iron, and therefore the melting
temperature of i... | 0902.1831v1 |
2009-05-23 | Kinetic Magnetism and Orbital Order in Iron Telluride | Iron telluride (FeTe), a relative of the iron based high temperature
superconductors, displays unusual magnetic order and structural transitions.
Here we explore the idea that strong correlations may play an important role in
these materials. We argue that the unusual orders observed in FeTe can be
understood from a pi... | 0905.3782v1 |
2009-07-02 | Moessbauer spectroscopy evidence for the lack of iron magnetic moment in superconducting FeSe | Superconducting FeSe has been investigated by measurements of the magnetic
susceptibility versus temperature and Moessbauer spectroscopy at various
temperatures including strong external magnetic fields applied to the absorber.
It was found that isomer shift exhibits sharply defined increase at about 105 K
leading to t... | 0907.0383v2 |
2010-06-19 | High resolution spectroscopic study of red clump stars in the Galaxy: iron group elements | The main atmospheric parameters and abundances of the iron group elements
(vanadium, chromium, iron, cobalt and nickel) are determined for 62 red giant
"clump" stars revealed in the Galactic field by the Hipparcos orbiting
observatory. The stars form a homogeneous sample with the mean value of
temperature T=4750 +- 160... | 1006.3857v1 |
2010-07-19 | Can an underestimation of opacity explain B-type pulsators in the SMC? | Slowly Pulsating B and $\beta$ Cephei are $\kappa$ mechanism driven pulsating
B stars. That $\kappa$ mechanism works since a peak in the opacity due to a
high number of atomic transitions from iron-group elements occurs in the area
of $\log T \approx 5.3$. Theoretical results predict very few SPBs and no
$\beta$ Cep to... | 1007.3088v1 |
2010-11-12 | Spin waves in the $(π,0)$ magnetically ordered iron chalcogenide Fe$_{1.05}$Te | We use inelastic neutron scattering to show that the spin waves in the iron
chalcogenide Fe$_{1.05}$Te display novel dispersion clearly different from
those in the related iron pnictide systems. By fitting the spin waves to a
Heisenberg Hamiltonian, we extract magnetic exchange couplings that are
dramatically different... | 1011.2930v2 |
2010-12-02 | Interstitial Iron Controlled Superconductivity in Fe1+xTe0.7Se0.3 | The superconducting series, Fe(Te,Se), has a complex structural and magnetic
phase diagram that is dependent on composition and occupancy of a secondary
interstitial Fe site. In this letter, we show that superconductivity in
Fe1+xTe0.7Se0.3 can be enhanced by topotactic deintercalation of the
interstitial iron, demonst... | 1012.0590v1 |
2010-12-31 | Binary and nonbinary description of hypointensity in human brain MR images | Accumulating evidence has shown that iron is involved in the mechanism
underlying many neurodegenerative diseases, such as Alzheimer's disease,
Parkinson's disease and Huntington's disease. Abnormal (higher) iron
accumulation has been detected in the brains of most neurodegenerative
patients, especially in the basal ga... | 1101.0242v1 |
2011-01-25 | Quantum criticality in the iron pnictides and chalcogenides | Superconductivity in the iron pnictides and chalcogenides arises at the
border of antiferromagnetism, which raises the question of the role of quantum
criticality. In this topical review, we describe the theoretical work that led
to the prediction for a magnetic quantum critical point arising out of a
competition betwe... | 1101.4701v1 |
2011-02-22 | Magneto-elastic quantum fluctuations and phase transitions in the iron superconductors | We examine the relevance of magneto-elastic coupling to describe the complex
magnetic and structural behaviour of the different classes of the iron
superconductors. We model the system as a two-dimensional metal whose magnetic
excitations interact with the distortions of the underlying square lattice.
Going beyond mean... | 1102.4622v2 |
2012-12-05 | Progress in wire fabrication of iron-based superconductors | Iron-based superconductors, with Tc values up to 55 K, are of great interest
for applications, due to their lower anisotropies and ultrahigh upper critical
fields. In the past 4 years, great progress has been made in the fabrication of
iron-based superconducting wires and tapes using the powder-in-tube (PIT)
processing... | 1212.1207v1 |
2013-05-30 | Searching for the missing iron in the core of the Centaurus cluster | We re-analyse a combined 198 ks Chandra observation of NGC4696, the brightest
galaxy of the Centaurus cluster. We extract temperature and metallicity
profiles from the data, and we confirm the presence of a sharp drop in iron
abundance, from ~1.8 Zsolar to ~0.4 Zsolar, within the central 5 kpc of the
cluster. We estima... | 1305.7046v3 |
2013-08-13 | The unique electronic structure of Ca10(Pt4As8)(Fe2-xPtxAs2)5 with metallic Pt4As8 layers | We studied the low-lying electronic structure of the newly discovered
iron-platinum-arsenide superconductor, Ca10(Pt4As8)(Fe2-xPtxAs2)5 (Tc=22 K)
with angle-resolved photoemission spectroscopy. We found that the Pt4As8 layer
contributes to a small electron-like Fermi surface, indicative of metallic
charge reservoir lay... | 1308.3105v1 |
2013-12-03 | Disk emission and atmospheric absorption lines in black hole candidate 4U 1630-472 | We re-analyzed SUZAKU data of the black hole candidate 4U 1630-472 being in
the high/soft state. We show that the continuum X-ray spectrum of 4U 1630-472
with iron absorption lines can be satisfactorily modeled by the spectrum from
an accretion disk atmosphere. Absorption lines of highly ionized iron
originating in hot... | 1312.0922v1 |
2014-05-22 | Electronic structure of iron-based superconductors: from pnictides to chalcogenides and other similar systems | This review discusses and compares electronic spectra of new iron-based
high-temperature superconductors (HTSC), as well as a number of chemically
similar compounds. Particular attention is payed to iron chalcogenide
K_{1-x}Fe_{2-y}Se_2, which is isostructural to BaFe_2As_2 (122) pnictide. It is
shown, that Fermi surfa... | 1405.5677v1 |
2014-05-26 | Dynamic transition in supercritical iron | Recent advance in understanding the supercritical state posits the existence
of a new line above the critical point separating two physically distinct
states of matter: rigid liquid and non-rigid gas-like fluid. The location of
this line, the Frenkel line, remains unknown for important real systems. Here,
we map the Fr... | 1405.6491v1 |
2014-06-13 | Effect of dopants on thermal stability and self-diffusion in iron nitride thin films | We studied the effect of dopants (Al, Ti, Zr) on the thermal stability of
iron nitride thin films prepared using a dc magnetron sputtering technique.
Structure and magnetic characterization of deposited samples reveal that the
thermal stability together with soft magnetic properties of iron nitride thin
films get signi... | 1406.3446v1 |
2014-06-14 | Emergence of magnetism and controlling factors of superconductivity in Li/Na-ammonia co-intercalated FeSe1-zTez | The discovery of superconductivity in alkali-ammonia co-intercalated FeSe has
generated intensive interest because of their highest Tc (~ 45 K) among
iron-chalcogenide superconductors with bulk form. Here, we report the phase
diagrams of two series of Li/Na-ammonia co-intercalated FeSe1-zTez. When
superconductivity is ... | 1406.3733v2 |
2014-07-18 | Magnetism and Superconductivity in Iron-based Superconductors Decided by Condensed Particle-hole Excitations away from the Fermi Level | The origin of magnetism and superconductivity in iron-based superconductors
is still unclear. Here, by investigating the momentum-dependent particle-hole
excitations which quantify the tendency of itinerant electrons towards various
magnetic states or superconducting phases, we unravel a novel origin to account
for the... | 1407.4888v1 |
2015-01-08 | The origin of the spurious iron spread in the globular cluster NGC 3201 | NGC 3201 is a globular cluster suspected to have an intrinsic spread in the
iron content. We re-analysed a sample of 21 cluster stars observed with
UVES-FLAMES at the Very Large Telescope and for which Simmerer et al. found a
0.4 dex wide [Fe/H] distribution with a metal-poor tail. We confirmed that when
spectroscopic ... | 1501.01968v1 |
2015-03-08 | Antiferromagnetic order and spin dynamics in iron-based superconductors | High-transition temperature (high-$T_c$) superconductivity in the iron
pnictides/chalcogenides emerges from the suppression of the static
antiferromagnetic order in their parent compounds, similar to copper oxides
superconductors. This raises a fundamental question concerning the role of
magnetism in the superconductiv... | 1503.02340v2 |
2015-09-05 | Iron abundance in the atmosphere of Arcturus | Abundance of iron in the atmosphere of Arcturus has been determined from the
profiles or regions of the profiles of the weak lines sensitive to iron
abundance. The selected lines of Fe I and Fe II were synthesized with the MARCS
theoretical models of the atmosphere. From the observed profiles of lines
available with a ... | 1509.01700v1 |
2015-10-22 | Internal structure of Pluto and Charon with an iron core | Pluto has been observed by the New Horizons space probe to have some
relatively fresh ice on the old ices covering most of the surface. Pluto was
thought to consist of only a rocky core below the ice. Here I show that Pluto
can have an iron core, as can also its companion Charon, which has recently
been modelled to hav... | 1510.06604v1 |
2016-01-05 | Testing the Kerr nature of black hole candidates using iron line reverberation mapping in the CPR framework | The iron K$\alpha$ line commonly observed in the X-ray spectrum of black hole
candidates is produced by X-ray fluorescence of the inner accretion disk. This
line can potentially be quite a powerful tool to probe the spacetime geometry
around these objects and test the Kerr black hole hypothesis. In a previous
paper, we... | 1601.00838v2 |
2016-01-27 | Particle-Hole Transformation in Strongly-Doped Iron-Based Superconductors | An exact particle-hole transformation is discovered in a local-moment model
for a single layer of heavily electron-doped FeSe. The model harbors hidden
magnetic order between the iron d_xz and d_yz orbitals at the wavenumber
(pi,pi). It potentially is tied to the magnetic resonances about the very same
Neel ordering ve... | 1601.07479v3 |
2016-02-13 | Origin of the Broad Iron Line Feature and the Soft X-ray Variation in Seyfert Galaxies | Many Seyfert galaxies are known to exhibit significant X-ray spectral
variations and seemingly broad iron K-emission line features. In this paper, we
show that the "variable partial covering model", which has been successfully
proposed for MCG-6.30-15 (Miyakawa, Ebisawa & Inoue 2012) and 1H0707.495
(Mizumoto, Ebisawa &... | 1602.04284v1 |
2016-03-10 | Ferromagnetism and particle collisions: applications to protoplanetary disks and the meteoritical record | The meteoritical record shows both iron partitioning and tungsten isotopic
partitioning between matrix and chondrules. Tungsten is not abundant enough to
have driven its own isotopic partitioning, but if tungsten were correlated with
iron, then ferromagnetic interactions grains could help explain both
observations. We ... | 1603.03326v1 |
2016-04-28 | Mössbauer parameters of Fe-related defects in group-IV semiconductors: first principles calculations | We employ a combination of pseudopotential and all-electron density
functional calculations, to relate the structure of defects in supercells to
the isomer shifts and quadrupole splittings observed in M\"ossbauer
spectroscopy experiments. The methodology is comprehensively reviewed and
applied to the technologically re... | 1604.08425v2 |
2016-05-13 | Crystal Chemistry and Structural Design of Iron-Based Superconductors | The second class of high-temperature superconductors (HTSCs), iron-based
pnictides and chalcogenides, necessarily contain Fe$_2$$X_2$ ("$X$" refers to a
pnictogen or a chalcogen element) layers, just like the first class of HTSCs
which possess the essential CuO$_2$ sheets. So far, dozens of iron-based HTSCs,
classified... | 1605.04179v1 |
2016-06-14 | Ab-initio perspective on structural and electronic properties of iron-based superconductors | The discovery of iron pnictides and iron chalcogenides as a new class of
unconventional superconductors in 2008 has generated an enourmous amount of
experimental and theoretical work that identifies these materials as correlated
metals with multiorbital physics, where magnetism, nematicity and
superconductivity are com... | 1606.04411v1 |
2016-12-07 | Direct observation of dispersive lower Hubbard band in iron-based superconductor FeSe | Electronic correlations were long suggested not only to be responsible for
the complexity of many novel materials, but also to form essential
prerequisites for their intriguing properties. Electronic behavior of
iron-based superconductors is far from conventional, while the reason for that
is not yet understood. Here w... | 1612.02313v1 |
2017-01-10 | Orbital-driven two-dome superconducting phases in iron-based superconductors | Recent several experiments revealed that novel bipartite
magnetic/superconducting phases widely exist in iron pnictides and
chalcogenides. Nevertheless, the origin of the two-dome superconducting phases
in iron-based compounds still remains unclear. Here we theoretically
investigated the electronic structures, magnetic... | 1701.02500v1 |
2017-01-31 | SANS contrast variation study of magnetoferritin structure at various iron loading | Magnetoferritin, a synthetic derivate of iron storage protein - ferritin, has
been synthesized with different iron oxide loading values. Small-angle neutron
scattering experiments were applied to study the structure of magnetoferritin
solutions using contrast variation method by varying the light to heavy water
ratio o... | 1701.09174v1 |
2017-01-30 | Effect of iron oxide loading on magnetoferritin structure in solution as revealed by SAXS and SANS | Synthetic biological macromolecule of magnetoferritin containing an iron
oxide core inside a protein shell (apoferritin) is prepared with different
content of iron. Its structure in aqueous solution is analyzed by small-angle
synchrotron X-ray (SAXS) and neutron (SANS) scattering. The loading factor (LF)
defined as the... | 1702.00350v1 |
2017-03-09 | Transport properties of iron at the Earth's core conditions: the effect of spin disorder | The electronic and thermal transport properties of the Earth's core are
crucial for many geophysical models such as the geodynamo model of the Earth's
magnetic field and of its reversals. Here we show, by considering bcc-iron and
iron-rich iron-silicon alloy as a representative of the Earth's core
composition and apply... | 1703.03205v3 |
2017-03-19 | Surface anisotropy of iron oxide nanoparticles and slabs from first principles : influence of coatings and ligands as a test of the Heisenberg model | We performed ab initio computations of the magnetic properties of simple iron
oxide clusters and slabs. We considered an iron oxide cluster functionalized by
a molecule or glued to a gold cluster of the same size. We also considered a
magnetite slab coated by cobalt oxide or a mixture of iron oxide and cobalt
oxide. Th... | 1703.06414v1 |
2017-06-16 | Robotic Ironing with 3D Perception and Force/Torque Feedback in Household Environments | As robotic systems become more popular in household environments, the
complexity of required tasks also increases. In this work we focus on a
domestic chore deemed dull by a majority of the population, the task of
ironing. The presented algorithm improves on the limited number of previous
works by joining 3D perception... | 1706.05340v1 |
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