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2017-10-09 | Appearance of a Domain Structure and its Electronic states in Iron Doped 1$T$-TaS$_2$ Observed using Scanning Tunneling Microscopy and Spectroscopy | In this paper, we report on scanning tunneling microscopy and spectroscopy
(STM/STS) measurements on iron doped 1$T$-Ta$_{1-x}$Fe$_x$S$_2$. A novel domain
structure composed of the domains with localized nature divided by the walls is
observed in Ta$_{0.99}$Fe$_{0.01}$S$_2$, where the Mott transition is
completely supp... | 1710.02979v1 |
2017-11-07 | Spin-Orbit Coupling and Magnetic Anisotropy in Iron-Based Superconductors | We determine theoretically the effect of spin-orbit coupling on the magnetic
excitation spectrum of itinerant multi-orbital systems, with specific
application to iron-based superconductors. Our microscopic model includes a
realistic ten-band kinetic Hamiltonian, atomic spin-orbit coupling, and
multi-orbital Hubbard int... | 1711.02460v1 |
2017-11-15 | Anisotropy of the Seebeck and Nernst coefficients in parent compounds of the iron-based superconductors | In-plane longitudinal and transverse thermoelectric phenomena in two parent
compounds of iron-based superconductors are studied. Namely, the Seebeck (S)
and Nernst (n) coefficients were measured in the temperature range 10 - 300 K
for BaFe2As2 and CaFe2As2 single crystals that were detwinned in-situ. The
thermoelectric... | 1711.05831v2 |
2017-12-19 | Emergent magnetic degeneracy in iron pnictides due to the interplay between spin-orbit coupling and quantum fluctuations | Recent experiments in iron pnictide superconductors reveal that, as the
putative magnetic quantum critical point is approached, different types of
magnetic order coexist over a narrow region of the phase diagram. Although
these magnetic configurations share the same wave-vectors, they break distinct
symmetries of the l... | 1712.07188v4 |
2018-01-22 | Excitation and charge transfer in low-energy hydrogen atom collisions with neutral iron | Data for inelastic processes due to hydrogen atom collisions with iron are
needed for accurate modelling of the iron spectrum in late-type stars.
Excitation and charge transfer in low-energy Fe+H collisions is studied
theoretically using a previously presented method based on an asymptotic
two-electron linear combinati... | 1801.07050v1 |
2018-02-26 | Iron-based trinuclear metal-organic nanostructures on a surface with local charge accumulation | Coordination chemistry relies on harnessing active metal sites within organic
matrices. Polynuclear complexes - consisting of organic ligands binding to
clusters of several metal atoms are of particular interest, owing to their
electronic/magnetic properties and potential for functional reactivity
pathways. However, th... | 1802.09146v1 |
2018-03-02 | Nonlinear uniaxial pressure dependence of $T_c$ in iron-based superconductors | We have systematically studied the effects of in-plane uniaxial pressure $p$
on the superconducting transition temperature $T_c$ in many iron-based
superconductors. The change of $T_c$ with $p$ is composed of linear and
nonlinear components. The latter can be described as a quadratic term plus a
much smaller fourth-ord... | 1803.00717v2 |
2018-04-11 | Fe intercalation under graphene and hexagonal boron nitride in-plane heterostructure on Pt(111) | Metal nanostructures confined between sp2 hybridized 2D materials and solid
supports are attracting attention for their potential application in new
nanotechnologies. Model studies under well-defined conditions are valuable for
understanding the fundamental aspects of the phenomena under 2D covers. In this
work we inve... | 1804.04240v1 |
2018-04-13 | Experimental evidence of a body centered cubic iron at the Earth's core condition | The crystal structure of iron in the Earth's inner core remains debated. Most
recent experiments suggest a hexagonal-close-packed (hcp) phase. In
simulations, it has been generally agreed that the hcp-Fe is stable at inner
core pressures and relatively low temperatures. At high temperatures, however,
several studies su... | 1804.05109v1 |
2018-04-19 | Anisotropy of the DC conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductors | We study the dc conductivity of iron-based superconductors within the
orbital-selective spin fluctuation scenario. Within this approach, the
anisotropy of spin fluctuations below the spin-nematic transition at T$_S$ is
also responsible for the orbital ordering, induced by nematic self-energy
corrections to the quasipar... | 1804.07293v4 |
2018-05-09 | Superconducting joint between iron-based superconductor tapes | Superconducting joints are essential for iron-based superconductor's
applications in future. In this study, a process for fabricating
superconducting joints between Sr1-xKxFe2As2 (Sr-122) tapes is developed for
the first time. The Ag sheath was peeled off from one side of each sample. The
exposed superconducting parts ... | 1805.03399v1 |
2018-06-28 | Fe3O4@astragalus polysaccharide core-shell nanoparticles for iron deficiency anemia therapy and magnetic resonance imaging in vivo | Fe3O4@astragalus polysaccharide core-shell nanoparticles (Fe3O4@APS NPs) were
demonstrated to be an efficient therapeutic drug for treating iron deficiency
anemia (IDA) in vivo. The Fe3O4@APS NPs have been synthesized using a two steps
approach involving hydrothermal synthesis and subsequent esterification.
Transmissio... | 1806.10740v1 |
2018-07-25 | Interplay between nematic fluctuation and superconductivity in the two-orbital Hubbard model: A quantum Monte Carlo study | To understand the interplay between nematic fluctuation and superconductivity
in iron-based superconductors, we performed a systematic study of the realistic
two-orbital Hubbard model by using the constrained-path quantum Monte Carlo
method. Our numerical results showed that the on-site nematic interaction
induces a st... | 1807.09457v1 |
2018-08-17 | Local Magnetic States of the Weakly Ferromagnetic Iron-Based Superconductor Sr$_2$VFeAsO$_{3-δ}$ Studied by X-ray Magnetic Circular Dichroism | We have performed x-ray magnetic circular dichroism (XMCD) measurements on
the iron-based superconductor Sr$_2$VFeAsO$_{3-\delta}$ to study the origin of
weak ferromagnetism (WFM) reported for this compound. While Fe 3$d$ electrons
show a magnetic response similar to the other iron pnictides, signals from V
3$d$ electr... | 1808.05715v3 |
2018-08-30 | Selective Aggregation Experiments on Planetesimal Formation and Mercury-Like Planets | Much of a planet's composition could be determined right at the onset of
formation. Laboratory experiments can constrain these early steps. This
includes static tensile strength measurements or collisions carried out under
Earth's gravity and on various microgravity platforms. Among the variety of
extrasolar planets wh... | 1808.10246v1 |
2018-09-10 | Hedgehog Spin-vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe1-xNix)4As4 Revealed by NMR | Two ordering states, antiferromagnetism and nematicity, have been observed in
most iron-based superconductors (SCs). In contrast to those SCs, the newly
discovered SC CaK(Fe$_{1-x}$Ni$_x$)$_4$As$_4$ exhibits an antiferromagnetic
(AFM) state, called hedgehog spin-vortex crystal structure, without nematic
order, providin... | 1809.03354v1 |
2018-11-06 | First study on iron complexes in blood and organ samples from thalassaemic and normal laboratory mice using Moessbauer spectroscopy | In this paper, blood and tissues samples from one normal and one thalassaemic
lab-mice were studied using 57Fe Mossbauer spectroscopy at 78K for the first
time. In contrast to human patients, these laboratory mice did not receive any
medical treatment, thus the iron components present in the samples are not
altered. Th... | 1811.02594v1 |
2018-12-16 | Strong electron-boson coupling in the iron-based superconductor BaFe1.9Pt0.1As2 revealed by infrared spectroscopy | Understanding the formation of Cooper pairs in iron-based superconductors is
one of the most important topics in condensed matter physics. In conventional
superconductors, the electron-phonon interaction leads to the formation of
Cooper pairs. In conventional strong-coupling superconductors like lead (Pb),
the features... | 1812.06546v1 |
2018-12-26 | Helical Hinge Majoranas in Iron-Based Superconductors | Motivated by recent experiments on FeTe$_{1-x}$Se$_{x}$, we construct an
explicit minimal model of an iron-based superconductor with band inversion at
the $Z$ point and non-topological bulk $s_{\pm}$ pairing. While there has been
considerable interest in Majorana zero modes localized at vortices in such
systems, we fin... | 1812.10493v2 |
2019-01-01 | A strongly inhomogeneous superfluid in an iron-based superconductor | Among the mysteries surrounding unconventional, strongly correlated
superconductors is the possibility of spatial variations in their superfluid
density. We use atomic-resolution Josephson scanning tunneling microscopy to
reveal a strongly inhomogeneous superfluid in the iron-based superconductor
FeTe0.55Se0.45. By sim... | 1901.00149v1 |
2019-01-29 | Interaction between Molecular Clouds and MeV-TeV Cosmic-ray Protons Escaped from Supernova Remnants | Recent discovery of the X-ray neutral iron line (Fe I K\alpha at 6.40 keV)
around several supernova remnants (SNRs) show that MeV cosmic-ray (CR) protons
are distributed around the SNRs and are interacting with neutral gas there. We
propose that these MeV CRs are the ones that have been accelerated at the SNRs
together... | 1901.10477v3 |
2019-03-01 | Broken mirror symmetry, incommensurate spin correlations, and $B_{2g}$ nematic order in iron pnictides | Motivated by growing indications for a distinct form of nematic correlations
in the extremely hole doped iron pnictide compounds $A$Fe$_2$As$_2$
($A$=K,Rb,Cs), we consider spin-driven nematic order in the general case of
incommensurate magnetic fluctuations. We classify the nematic order parameters
by broken mirror sym... | 1903.00375v2 |
2019-03-12 | Epsilon-iron as a spin-smectic state | Using x-ray emission spectroscopy, we find appreciable local magnetic moments
until 30-40 GPa in the high-pressure phase of iron, however no magnetic order
is detected with neutron powder diffraction down to 1.8 K contrary to previous
predictions. Our first-principles calculations reveal a "spin-smectic" state
lower in... | 1903.04792v2 |
2019-03-15 | Plasma environment effects on K lines of astrophysical interest. II. Ionization potentials, K thresholds, radiative rates and Auger widths in Ne- through He-like iron ions (Fe xvii - Fe xxv) | Aims. In the context of accretion disks around black holes, we estimate
plasma-environment effects on the atomic parameters associated with the decay
of K-vacancy states in highly charged iron ions, namely Fe xvii - Fe xxv.
Methods. Within the relativistic multiconfiguration Dirac-Fock (MCDF)
framework, the electron-nu... | 1903.06458v1 |
2019-04-11 | Strain tuning and anisotropic spin correlations in iron-based systems | Nematic order in the iron-based superconductors is closely tied to a lattice
distortion and a structural transition from tetragonal to orthorhombic
symmetry. External stress of the appropriate symmetry acts as a conjugate field
of the nematic order parameter and can be utilized to detwin nematic domains
but also smears... | 1904.05583v2 |
2019-04-27 | Neutron star radius measurement from the ultraviolet and soft X-ray thermal emission of PSR J0437-4715 | We analyzed the thermal emission from the entire surface of the millisecond
pulsar PSR J0437-4715 observed in the ultraviolet and soft X-ray bands. For
this, we calculated non-magnetized, partially ionized atmosphere models of
hydrogen, helium, and iron compositions and included plasma frequency effects
that may affect... | 1904.12114v2 |
2019-05-01 | p-Wave Superconductivity in Iron-based Superconductors | The possibility of p-wave pairing in superconductors has been proposed more
than five decades ago, but has not yet been convincingly demonstrated. One
difficulty is that some p-wave states are thermodynamically indistinguishable
from s-wave, while others are very similar to d-wave states. Here we studied
the self-field... | 1905.00183v3 |
2019-06-21 | Topological Crystalline Superconductivity in Dirac Semimetal Phase of Iron-based Superconductors | In iron-based superconductors, band inversion of $d$- and $p$-orbitals yields
Dirac semimetallic states. We theoretically investigate their topological
properties in normal and superconducting phases, based on the tight-binding
model involving full symmetry of the materials. We demonstrate that a Cooper
pair between el... | 1906.09286v1 |
2019-08-30 | Magnetic states of iron-based two-leg ladder tellurides | The recent discovery of superconductivity at high pressure in the two-leg
ladder compounds BaFe$_2X_3$ ($X$=S, Se) started the novel field of
quasi-one-dimensional iron-based superconductors. In this publication, we use
Density Functional Theory (DFT) to predict that the previously barely explored
ladder compound RbFe$... | 1908.11765v2 |
2019-09-10 | Anisotropic magnetic excitations of a frustrated bilinear-biquadratic spin model -- Implications for spin waves of detwinned iron pnictides | Elucidating the nature of spin excitations is important to understanding the
mechanism of superconductivity in the iron pnictides. Motivated by recent
inelastic neutron scattering measurements in the nearly 100% detwinned
BaFe$_{2}$As$_{2}$, we study the spin dynamics of an $S=1$ frustrated
bilinear-biquadratic Heisenb... | 1909.04555v2 |
2019-09-21 | Dynamical stability of radiation-induced C15 clusters in iron | Density functional theory predicts clusters in the form of the C15 Laves
phase to be the most stable cluster of self-interstitials in iron at small
sizes. The C15 clusters can form as a result of irradiation, but their
prevalence and survival in harsh irradiation conditions have not been
thoroughly studied. Using a new... | 1909.09818v1 |
2019-10-31 | Quantum critical nematic fluctuations and spin excitation anisotropy in iron pnictides | Quantum criticality in iron pnictides involves both the nematic and
antiferromagnetic degrees of freedom, but the relationship between the two
types of fluctuations has yet to be clarified. Here we study this problem in
the presence of a small external uniaxial potential, which breaks the
$C_4$-symmetry in the B$_{1g}$... | 1910.14597v4 |
2019-12-11 | Hypothetical hyperbolic encounters between Venus and proto-Mercury that partially \ stripped away proto-Mercury's mantle | Mercury has an unusually large metal core comprising ~70% of its mass
comparing to all other terrestrial planets in the solar system. Giant impacts
can remove a significant fraction of the silicate mantle of a chondritic
proto-Mercury and form the iron rich present-day Mercury. However, such
high-temperature giant impa... | 1912.05219v1 |
2019-12-12 | X-ray reverberation lags from the 1.5 Seyfert galaxy NGC 5273 | We present the results of X-ray spectral-timing analysis of a 90ks XMM-Newton
observation of the nearby, broad line, early-type AGN NGC5273. The X-ray
spectrum revealed the clear presence of a reflection component at high
energies, with a clear signature of a narrow iron line at 6.4 keV, consistent
with distant reflect... | 1912.06196v1 |
2020-02-18 | Low work function in the 122-family of iron-based superconductors | We determine the work functions of the iron arsenic compounds $A$Fe$_2$As$_2$
($A=\mathrm{Ca, Ba, Cs}$) using photoemission spectroscopy to be 2.7 eV for
CaFe$_2$As$_2$, 1.8 eV for BaFe$_2$As$_2$, and 1.3 eV for CsFe$_2$As$_2$. The
work functions of these 122 iron-based superconductors track those of the
elementary met... | 2002.07924v1 |
2020-02-21 | Iron Line Tomography of General Relativistic Hydrodynamic Accretion around Kerr Black Holes | We consider a temporal response of relativistically broadened line spectrum
of iron from black hole accretion irradiated by an X-ray echo under strong
gravity. The physical condition of accreting gas is numerically calculated in
the context of general relativistic hydrodynamics under steady-state,
axisymmetry in Kerr g... | 2002.09550v1 |
2020-02-22 | Molecular static simulation of edge dislocation core in bcc iron | We simulate the dislocation core structure in bcc iron using the modified
Molecular Static method. A feature of this method is the application of an
iterative procedure in which the atomic structure in the vicinity of the defect
and the constants that determine the displacements of atoms immersed in the
elastic continu... | 2002.09601v2 |
2020-02-25 | A Type Ia supernova at the heart of superluminous transient SN 2006gy | Superluminous supernovae radiate up to 100 times more energy than normal
supernovae. The origin of this energy and the nature of their stellar
progenitors are poorly understood. We identify neutral iron lines in the
spectrum of one such transient, SN 2006gy, and show that they require a large
mass of iron (>~0.3 Msun) ... | 2002.10768v1 |
2020-05-07 | In the Pursuit of Majorana Modes in Iron-based High-$T_c$ Superconductors | Majorana zero mode is an exotic quasi-particle excitation with non-Abelian
statistics in topological superconductor systems, and can serve as the
cornerstone for topological quantum computation, a new type of fault-tolerant
quantum computation architecture. This review paper highlights recent progress
in realizing Majo... | 2005.03603v1 |
2020-05-11 | Simplified ResNet approach for data driven prediction of microstructure-fatigue relationship | The heterogeneous microstructure in metallic components results in locally
varying fatigue strength. Metal fatigue strongly depends on size and shape of
non-metallic inclusions and pores, commonly referred to as "defects". Nodular
cast iron (NCI) contains graphite inclusions (nodules) whose shape and
frequency influenc... | 2005.06615v1 |
2020-06-05 | Observation of Two-dimensional Superconductivity in an Ultrathin Iron-Arsenic Superconductor | Two-dimensional (2D) superconductors supply important platforms for exploring
new quantum physics and high-$T_c$ superconductivity. The intrinsic
superconducting properties in the 2D iron-arsenic superconductors are still
unknown owing to the difficulties in the preparation of ultrathin samples. Here
we report the fabr... | 2006.03338v1 |
2020-06-24 | Composition and Size Dependent Sorting in Preplanetary Growth: Seeding the Formation of Mercury-like Planets | In an earlier work, we found that large metallic iron fractions in dust
aggregates and strong magnetic fields boost preplanetary growth. This sets an
initial bias for the formation of Mercury-like planets in the inner part of
protoplanetary disks. We extended these experiments here by adding pure quartz
aggregates to t... | 2006.13692v1 |
2020-07-14 | In-plane p-wave coherence length in iron-based superconductors | High-temperature superconductivity in iron-based layered compounds discovered
by Hosono group (Kamihara et al 2006 J. Am. Chem. Soc. 128 10012) is
fascinating physical phenomenon which still has many unanswered questions. One
of these questions is the superconducting gap symmetry in iron-based
superconductors (IBS), fo... | 2007.07110v1 |
2020-08-20 | Canted Antiferromagnetism in the Quasi-1D Iron Chalcogenide BaFe$_{2}$Se$_{4}$ | We report the synthesis and physical properties studies of quais-1D iron
chalcogenide $\rm BaFe_2Se_4$ which shares the $\rm FeSe_4$ tetrahedra building
motif commonly seen in the iron chalcogenide superconductors. A high-quality
polycrystalline sample was achieved by solid-state reaction method and
characterized by X-... | 2008.08809v1 |
2020-09-04 | Strong enhancement of magnetic order from bulk to stretched monolayer FeSe as Hund's metals | Despite of the importance of magnetism in possible relation to other key
properties in iron-based superconductors, its understanding is still far from
complete especially for FeSe systems. On one hand, the origin of the absence of
magnetic orders in bulk FeSe is yet to be clarified. On the other hand, it is
still not c... | 2009.02024v1 |
2020-09-24 | Probing redox potential for Iron sulfur clusters in photosystem I | Photosystem I is a light-driven electron transfer device. Available X-ray
crystal structure from Thermosynechococcus elongatus, showed that electron
transfer pathways consist of two nearly symmetric branches of cofactors
converging at the first iron sulfur cluster FX, which is followed by two
terminal iron sulfur clust... | 2009.11681v1 |
2020-10-11 | Electrical properties of thermal oxide scales on pure iron in liquid lead-bismuth eutectic | The impedance behavior of pre-oxidized iron in liquid lead-bismuth eutectic
(LBE) at 200 oC is studied using electrochemical impedance spectroscopy. The
structures and resistance of oxide grown on iron oxidized in air at different
temperatures and durations are compared. The results show that the resistance
of the oxid... | 2010.05372v1 |
2020-10-15 | Anomalous thermal properties and spin crossover of ferromagnesite (Mg,Fe)CO3 | Ferromagnesite (Mg,Fe)CO3, also referred to as magnesiosiderite at high iron
concentration, is a solid solution of magnesite (MgCO3) and siderite (FeCO3).
Ferromagnesite is believed to enter the Earth's lower mantle via subduction and
is considered a major carbon carrier in the Earth's lower mantle, playing a key
role ... | 2010.07720v2 |
2020-11-11 | Electron doping of the iron-arsenide superconductor CeFeAsO controlled by hydrostatic pressure | In the iron-pnictide material CeFeAsO not only the Fe moments, but also the
local 4f moments of the Ce order antiferromagnetically at low temperatures. We
elucidate on the peculiar role of the Ce on the emergence of superconductivity.
While application of pressure suppresses the iron SDW ordering temperature
monotonous... | 2011.05665v1 |
2020-11-17 | Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3 | Nematic orders emerge nearly universally in iron-based superconductors, but
elucidating their origins is challenging because of intimate couplings between
orbital and magnetic fluctuations. The iron-based ladder material BaFe2S3,
which superconducts under pressure, exhibits antiferromagnetic order below TN ~
117K and a... | 2011.08600v1 |
2020-11-25 | Expansion and Age of the Supernova Remnant G350.1-0.3: High-Velocity Iron Ejecta from a Core-Collapse Event | We report Chandra observations of the highly asymmetric core-collapse
supernova remnant G350.1-0.3. We document expansion over 9 years away from the
roughly stationary central compact object, with sky-plane velocities up to
$5000 d_{4.5}$ km s$^{-1}$ ($d_{4.5}$ is the distance in units of 4.5 kpc),
redshifts ranging fr... | 2011.12977v2 |
2020-12-18 | Efficient Analytical Approach for High-Pressure Melting Properties of Iron | Iron represents the principal constituent of the Earth's core, but its
high-pressure melting diagram remains ambiguous. Here we present a simple
analytical approach to predict the melting properties of iron under deep-Earth
conditions. In our model, anharmonic free energies of the solid phase are
directly determined by... | 2012.10023v1 |
2021-02-19 | Thermodynamic electric quadrupole moments of nematic phases from first-principles calculation | The electronic nematic phase emerging with spontaneous rotation symmetry
breaking is a central issue of modern condensed matter physics. In particular,
various nematic phases in iron-based superconductors and high-$T_{\rm c}$
cuprate superconductors are extensively studied recently. Electric quadrupole
moments (EQMs) a... | 2102.09783v1 |
2021-03-16 | Accretion geometry of the black hole binary MAXI J1820+070 probed by frequency-resolved spectroscopy | The geometry of the inner accretion flow in the hard and hard-intermediate
states of X-ray binaries remains controversial. Using NICER observations of the
black hole X-ray binary MAXI J1820+070 during the rising phase of its 2018
outburst, we study the evolution of the timing properties, in particular the
characteristi... | 2103.08795v1 |
2021-03-16 | Emerging symmetric strain response and weakening nematic fluctuations in strongly hole-doped iron-based superconductors | Electronic nematicity is often found in unconventional superconductors,
suggesting its relevance for electronic pairing. In the strongly hole-doped
iron-based superconductors, the symmetry channel and strength of the nematic
fluctuations, as well as the possible presence of long-range nematic order,
remain controversia... | 2103.08972v1 |
2021-05-25 | Dynamics of particles with cubic magnetic anisotropy in a viscous liquid | The specific absorption rate (SAR) of a dilute assembly of spherical iron
nanoparticles with cubic anisotropy distributed in a viscous liquid is
calculated using the solution of stochastic Landau - Lifshitz equation for unit
magnetization vector and stochastic equations for multiple particle directors
that specify the ... | 2105.11916v1 |
2021-06-06 | Testing the Kerr black hole hypothesis with GRS 1716-249 by combining the continuum-fitting and the iron-line methods | The continuum-fitting and the iron-line methods are currently the two leading
techniques for measuring the spins of accreting black holes. In the past few
years, these two methods have been developed for testing fundamental physics.
In the present work, we employ state-of-the-art models to test black holes
through the ... | 2106.03086v2 |
2021-06-21 | Testing the Kerr black hole hypothesis with the continuum-fitting and the iron line methods: the case of GRS 1915+105 | The continuum-fitting and the iron line methods are currently the two leading
techniques for probing the strong gravity region around accreting black holes.
In the present work, we test the Kerr black hole hypothesis with the
stellar-mass black hole in GRS 1915+105 by analyzing five disk-dominated RXTE
spectra and one ... | 2106.10982v2 |
2021-06-24 | Artificial neural network molecular mechanics of iron grain boundaries | This study reports grain boundary (GB) energy calculations for 46
symmetric-tilt GBs in alpha-iron using molecular mechanics based on an
artificial neural network (ANN) potential and compares the results with
calculations based on the density functional theory (DFT), the embedded atom
method (EAM), and the modified EAM... | 2106.12745v1 |
2021-08-12 | Polarized neutron scattering studies of magnetic excitations in iron-selenide superconductor (Li$_{0.8}$Fe$_{0.2}$)ODFeSe ($T_c$ = 41 K) | We report polarized neutron scattering measurements of the low energy spin
fluctuations of the iron-selenide superconductor Li$_{0.8}$Fe$_{0.2}$ODFeSe
below and above its superconducting transition temperature $T_c=41$ K. Our
experiments confirmed that the resonance mode near 21 meV is magnetic.
Moreover, the spin exci... | 2108.05832v1 |
2021-08-25 | Cooling Delays from Iron Sedimentation and Iron Inner Cores in White Dwarfs | Do white dwarfs have inner cores made of iron? Neutron rich nuclei like
$^{56}$Fe experience a net gravitational force and sediment toward the core.
Using new phase diagrams and molecular dynamics simulations, we show that
$^{56}$Fe should separate into mesoscopic Fe-rich crystallites due to its large
charge relative t... | 2108.11389v1 |
2021-09-10 | Interference Effect of Beam Splitter Current in Iron-Pnictide Superconductors | We consider a Cooper pair beam splitter for Iron-Pnictide superconductor and
calculate the entangled electron-hole current. We investigate the interplay of
various physical parameters such as doping at electron and hole pockets as well
as non-zero nesting between the electron and hole pocket. We find that in the
absenc... | 2109.04796v2 |
2021-09-19 | Data analysis of $ab$ $initio$ effective Hamiltonians in iron-based superconductors $\unicode{x2014}$ Construction of predictors for superconducting critical temperature | High-temperature superconductivity occurs in strongly correlated materials
such as copper oxides and iron-based superconductors. Numerous experimental and
theoretical works have been done to identify the key parameters that induce
high-temperature superconductivity. However, the key parameters governing the
high-temper... | 2109.09121v2 |
2021-10-01 | Iron-rich Fe-O compounds with closest-packed layers at core pressures | Oxygen solubility in solid iron is extremely low, even at high pressures and
temperatures. Thus far, no Fe-O compounds between Fe and FeO endmembers have
been reported experimentally. We observed chemical reactions of Fe with FeO or
Fe$_2$O$_3$ $in\ situ$ x-ray diffraction experiments at 220-260 GPa and
3,000-3,500 K. ... | 2110.00524v1 |
2021-11-22 | Oxygen-driven enhancement of electron correlation in hexagonal iron at Earth's inner core conditions | Earth's inner core consists of mainly iron with a bit of light elements.
Understanding of its structure and related physical properties has been elusive
for both experiment and theory due to its required extremely high pressure and
temperature conditions. Here, using density functional theory plus dynamical
mean field ... | 2111.11033v1 |
2021-12-01 | Comparison of hydrogen diffusivities measured by electrochemical permeation and temperature-programmed desorption in cold-rolled pure iron | The diffusivity of hydrogen in cold-rolled pure iron is investigated using
permeation and desorption methods. Electrochemical charging, electro-permeation
and thermal desorption spectroscopy (TDS) experiments are conducted. Firstly,
the relation between the charging current and the hydrogen concentration is
established... | 2112.00589v1 |
2022-01-27 | FeSe and the missing electron pocket problem | The nature and origin of electronic nematicity remains a significant
challenge in our understanding of the iron-based superconductors. This is
particularly evident in the iron chalcogenide, FeSe, where it is currently
unclear how the experimentally determined Fermi surface near the M point
evolves from having two elect... | 2201.11702v1 |
2022-02-01 | Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect | The role of nematic fluctuations for unconventional superconductivity has
been subject of intense discussions for many years. In iron-based
superconductors, the most established probe for electronic-nematic
fluctuations, i.e. the elastoresistivity seems to imply that superconductivity
is reinforced by electronic-nemati... | 2202.00485v1 |
2022-02-14 | Hydrothermal synthesis, structure, and antibacterial studies of a nanosized iron zeolite | The present research explores the effects of Percentage Fe incorporation on
the structure and antibacterial activity of Fe ZSM 5. Silica extracted from
local rice husk straw (white particles) by applying NaOH and HCl solutions for
consecutive chemical treatment was used for hydrothermal synthesis of FeZSM 5
with consta... | 2202.06900v1 |
2022-03-01 | Ultrafast Melting of Superconductivity in an Iron-Based Superconductor | Intense debate has recently arisen regarding the photoinduced changes to the
iron-chalcogenide superconductors, including the enhancement of
superconductivity and a metastable state. Here, by employing high energy
resolution, we directly observe the melting of superconductivity on ultrafast
timescales. We demonstrate a... | 2203.00678v2 |
2022-03-26 | Ferromagnetic Impurity Induced Majorana Zero Mode in Iron-Based Superconductor | Recent experiments reported the puzzling zero energy modes associated with
ferromagnetic impurities in some iron-based superconductors with topological
band structures. Here, we show that the sufficiently strong exchange coupling
between a ferromagnetic impurity and substrate can trigger a quantum phase
transition, bey... | 2203.14017v3 |
2022-04-14 | Orbital memory from individual Fe atoms on black phosphorus | Bistable valency in individual atoms presents a new approach toward
single-atom memory, as well as a building block to create tunable and
stochastic multi-well energy landscapes. Yet, this concept of orbital memory
has thus far only been observed for cobalt atoms on the surface of black
phosphorus, which are switched u... | 2204.06915v1 |
2022-04-19 | Recycling End-of-life Polycarbonate in Steelmaking; $\textit{Ab Initio}$ Study of Carbon Dissolution in Molten Iron | The scarcity of fossil fuels as carbon resources has motivated the
steelmaking industry to search for new carbon sources such as end-of-life
polymeric products. Using $\textit{ab initio}$ molecular dynamics simulation,
we demonstrate that 41% of polycarbonate's carbon content is readily dissolved
in molten iron's inter... | 2204.08706v1 |
2022-04-20 | Control of magnetic susceptibility of probiotic strain Lactobacillus Rhamnosus GG | The paper investigates the increase in the natural magnetically controlled
properties of probiotic microorganisms Lactobacillus rhamnosus GG (LGG) and
their ability to form magnetic sensitive inclusions (MsI). The magnetic
susceptibility of LGG was increased by modifying the nutrient medium
composition and by cultivati... | 2204.09338v1 |
2022-04-27 | On the possibility of incorporation of the iron impurity into $A$ sites in SrTiO$_3$ | The local environment and oxidation state of the Fe impurity in strontium
titanate are studied using XAFS spectroscopy. The influence of annealing
temperature and deviation from stoichiometry on the possibility of
incorporation of the impurity into the $A$ and $B$ sites of the perovskite
structure is studied. The resul... | 2204.12775v2 |
2022-05-04 | Ab initio melting temperatures of bcc and hcp iron under the Earth's inner core condition | There has been a long debate on the stable phase of iron under the Earth's
inner core conditions. Because of the solid-liquid coexistence at the inner
core boundary, the thermodynamic stability of solid phases directly relates to
their melting temperatures, which remains considerable uncertainty. In the
present study, ... | 2205.02290v2 |
2022-08-03 | Magnetic biophysical characterization of biomimetic polyeth-ylenimine-coated nanoparticles on in vitro silico model | Understanding the biophysical and magnetic interactions of nanoparticles
(NPs) with cell mem-branes is critical for developing effective nanocarrier
systems for drug delivery applications and targeted nanophysics applications.
Recent discoveries in nanomedicine can be used to test an in vitro system that
reproduce a si... | 2208.02838v1 |
2022-09-29 | Exploring Supernova Gravitational Waves with Machine Learning | Core-collapse supernovae (CCSNe) emit powerful gravitational waves (GWs).
Since GWs emitted by a source contain information about the source, observing
GWs from CCSNe may allow us to learn more about CCSNs. We study if it is
possible to infer the iron core mass from the bounce and early ring-down GW
signal. We generate... | 2209.14542v2 |
2022-11-03 | Magnetism in Two-Dimensional Ilmenenes: Intrinsic Order and Strong Anisotropy | Iron ilmenene is a new two-dimensional material that has recently been
exfoliated from the naturally-occurring iron titanate found in ilmenite ore, a
material that is abundant on earth surface. In this work, we theoretically
investigate the structural, electronic and magnetic properties of 2D
transition-metal-based ilm... | 2211.01732v1 |
2023-02-03 | Effect of iron thicknesses on spin transport in a Fe/Au bilayer system | This paper is concerned with a theoretical analysis of the behavior of
optically excited spin currents in bilayer and multilayer systems of
ferromagnetic and normal metals. As the propagation, control and manipulation
of the spin currents created in ferromagnets by femtosecond optical pulses is
of particular interest, ... | 2302.01472v1 |
2023-06-13 | Origin of superionic state in Earth's inner core | Earth's inner core (IC) serves as a reservoir for volatile elements, which
significantly affects its behavior and properties. Recent studies suggest that
superionicity can be observed in ice and iron hydrides under high-pressure and
temperature conditions, providing an alternative understanding of the planet's
interior... | 2306.07534v1 |
2023-06-14 | Slope of the upper critical field at $T_{c}$ in two-band superconductors with non-magnetic disorder: $s_{++}$ superconductivity in $\textrm{Ba}_{1-x}\textrm{K}_{x}\textrm{Fe}_{2}\textrm{As}_{2}$ | A recent theory of the disorder-dependent slope of the upper critical field,
$H_{c2}$, at the superconducting transition temperature, $T_{c}$, is extended
to multiband superconductors aiming at iron-based superconductors, considering
two constant gaps of different magnitude and, potentially, different signs. The
result... | 2306.08703v2 |
2023-06-22 | Data-Driven Update of B(H) Curves of Iron Yokes in Normal Conducting Accelerator Magnets | Constitutive equations are used in electromagnetic field simulations to model
a material response to applied fields or forces. The $B(H)$ characteristic of
iron laminations depends on thermal and mechanical stresses that may have
occurred during the manufacturing process. Data-driven modelling and updating
of the $B(H)... | 2306.12872v1 |
2023-09-30 | High gas pressure and high-temperature synthesis (HP-HTS) technique and its impact on iron-based superconductors | The high-pressure growth technique generally plays an important role in the
improvement of the sample quality and the enhancement of various physical and
magnetic properties of materials. The high gas pressure technique provides a
large sample space (10-15 cm) to grow various kinds of materials. In this
paper, we intro... | 2310.00282v1 |
2023-10-09 | Detection of Iron in Nanoclustered Cytochrome C Proteins Using Nitrogen-Vacancy Magnetic Relaxometry | Nitrogen-vacancy (NV) magnetometry offers an alternative tool to detect iron
levels in neurons and cells with a favorable combination of magnetic
sensitivity and spatial resolution. Here we employ NV-T1 relaxometry to detect
Fe in cytochrome C (Cyt-C) nanoclusters. Cyt-C is a water-soluble protein that
contains a singl... | 2310.08605v2 |
2023-11-10 | Machine Learning-Driven Structure Prediction for Iron Hydrides | We created a computational workflow to analyze the potential energy surface
(PES) of materials using machine-learned interatomic potentials in conjunction
with the minima hopping algorithm. We demonstrate this method by producing a
versatile machine-learned interatomic potential for iron hydride via a neural
network us... | 2311.06010v1 |
2023-11-15 | Probing Iron in Earth's Core With Molecular-Spin Dynamics | Dynamic compression of iron to Earth-core conditions is one of the few ways
to gather important elastic and transport properties needed to uncover key
mechanisms surrounding the geodynamo effect. Herein a new machine-learned
ab-initio derived molecular-spin dynamics (MSD) methodology with explicit
treatment for longitu... | 2311.08737v1 |
2023-11-21 | Speciation controls the kinetics of iron hydroxide precipitation and transformation | The formation of energetically favourable and metastable mineral phases
within the Fe-H2O system controls the long-term mobility of iron complexes as
well as other aqueous phase constituents in natural aquifers, soils and other
environmentally and industrially relevant systems. The fundamental mechanism
controlling the... | 2311.12464v1 |
2024-01-04 | Exploring the Unconventional Electron Distribution Patterns in Iron-based Superconductors | For more than a decade, the unusual distribution of electrons observed in
ARPES (angle-resolved photoemission spectroscopy) data within the energy range
of ~30meV to ~300meV below the Fermi level, known as the ARPES range, has
remained a puzzle in the field of iron-based superconductivity. However, in
this study, we ha... | 2401.02140v1 |
2024-01-16 | Unusually weak irradiation effects in anisotropic iron-based superconductor RbCa2Fe4As4F2 | We report on the effects of 3.5 MeV proton irradiation in
RbCa$_2$Fe$_4$As$_4$F$_2$, an iron-based superconductor with unusual properties
in between those of the pnictides and of the cuprate high-temperature
superconductors. We studied how structural disorder introduced by ion
bombardment affects the critical temperatu... | 2401.08279v1 |
2024-01-18 | X-ray Iron absorption line in Swift J1858.6-0814 | We present the spectral analysis of bright steady states in an outburst of
the transient neutron star low-mass X-ray binary (NS-LMXB) Swift J1858.6-0814
observed with NICER. We detected an ionized iron K absorption line (H-like Fe)
at 6.97keV in the spectrum. We estimated the photoionization parameter using
the ratio o... | 2401.09664v1 |
2024-01-31 | Tailoring magnetic and hyperthermia properties of biphase iron oxide nanocubes through post-annealing | Tailoring the magnetic properties of iron oxide nanosystems is essential to
expand their biomedical applications. In this study, the 34 nm iron oxide
nanocubes with two phases consisting of Fe3O4 and alpha-Fe2O3 were annealed for
2 hours in the presence of O2, N2, He, and Ar to tune the respective phase
volume fraction... | 2401.18009v1 |
2024-03-19 | Growth of metal catalyst nanoparticles in hydrocarbon-rich atmosphere of arc discharge for synthesis of carbon nanotubes | A direct current (DC) arc discharge is a widely used method for
industrial-scale production of single-walled carbon nanotubes (SWCNT). A
high-selectivity synthesis of SWCNT requires ultra-fine, typically a few
nanometers in diameter, catalyst particles, which is challenging to achieve in
harsh arc environments involvin... | 2403.12700v1 |
2004-08-18 | Heavy elements and chemical enrichment in globular clusters | High resolution (R > 40 000) and high S/N spectra have been acquired with
UVES on the VLT-Kueyen (Paranal Observatory, ESO Chile) for several main
sequence turnoff stars (V ~ 17 mag) and subgiants at the base of the Red Giant
Branch (V ~ 16 mag) in three globular clusters (NGC 6397, NGC 6752 and 47
Tuc/NGC 104) at diff... | 0408330v1 |
1993-11-15 | Spin Gaps and Bilayer Coupling in YBa$_2$Cu$_3$O$_{7-δ}$ and YBa$_2$Cu$_4$O$_8$ | We investigate the relevance to the physics of underdoped
YBa$_2$Cu$_3$O$_{\rm 6+x}$ and YBa$_2$Cu$_4$O$_8$ of the quantum critical point
which occurs in a model of two antiferromagnetically coupled planes of
antiferromagnetically correlated spins. We use a Schwinger boson mean field
theory and a scaling analysis to ob... | 9311035v1 |
1998-07-04 | Theory for Metal Hydrides with Switchable Optical Properties | Recently it has been discovered that lanthanum, yttrium, and other metal
hydride films show dramatic changes in the optical properties at the
metal-insulator transition. Such changes on a high energy scale suggest the
electronic structure is best described by a local model based on negatively
charged hydrogen (H$^-$) i... | 9807062v1 |
1998-12-01 | Physical origin of the buckling in CuO$_2$: Electron-phonon coupling and Raman spectra | It is shown theoretically that the buckling of the CuO$_{2}$ planes in
certain cuprate systems can be explained in terms of an electric field across
the planes which originates from different valences of atoms above and below
the plane. This field results also in a strong coupling of the Raman-active
out-of-phase vibra... | 9812014v1 |
2003-10-25 | Characterization of the electronic properties of YB$_4$ and YB$_6$ using $^{11}$B NMR and first-principles calculations | Two compounds, tetragonal YB$_4$ and cubic YB$_6$, have been investigated by
electric-field gradient (EFG) and Knight shift measurements at the boron sites
using the $^{11}$B nuclear magnetic resonance (NMR) technique and by performing
first-principles calculations. In YB$_6$ $^{11}$B ($I=3/2$) NMR spectra reveal
patte... | 0310602v1 |
2005-02-02 | Analysis of NMR Spin-Lattice Relaxation Rates in Cuprates | We investigate nuclear spin-lattice relaxation data in the normal state of
optimally doped YBaCuO_7 by analyzing the contributions to the relaxation rate
of the copper, planar oxygen and yttrium along the directions perpendicular to
the applied field. In this new picture there is no contrasting temperature
dependence o... | 0502075v2 |
2010-03-09 | Dynamical evolution of titanium, strontium, and yttrium spots on the surface of the HgMn star HD 11753 | Aims. We gathered about 100 high-resolution spectra of three typical HgMn
(mercury-manganese) stars, HD 11753, HD 53244, and HD 221507, to search for
slowly pulsating B-like pulsations and surface inhomogeneous distribution of
various chemical elements. Methods. Classical frequency analysis methods were
used to detect ... | 1003.1902v1 |
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