publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2016-01-14 | Coupled multiple-mode theory for $s_{\pm}$ pairing mechanism in iron based superconductors | We investigate the interplay between the magnetic and the superconducting
degrees of freedom in unconventional multi-band superconductors such as iron
pnictides. For this purpose a dynamical mode-mode coupling theory is developed
based on the coupled Bethe-Salpeter equations. In order to investigate the
region of the p... | 1601.03552v2 |
2016-01-21 | Effect of nonsymmorphic space group on correlation functions in iron-based superconductors | The orbital basis is natural when one needs to calculate the effect of local
interactions or to unravel the role of orbital physics in the response to
external probes. In systems with nonsymmorphic point groups, such as the
iron-based superconductors, we show that symmetries that emerge in observable
response functions... | 1601.05813v3 |
2016-02-02 | Fast synthesis of Fe1.1Se1-xTex superconductors in a self-heating and furnace-free way | A fast and furnace-free method of combustion synthesis is employed for the
first time to synthesize iron-based superconductors. Using this method,
Fe1.1Se1-xTex (0<=x<=1) samples can be prepared from self-sustained reactions
of element powders in only tens of seconds. The obtained Fe1.1Se1-xTex samples
show clear zero ... | 1602.00880v1 |
2016-02-04 | A quantum protective mechanism in photosynthesis | Since the emergence of oxygenic photosynthesis, living systems have developed
protective mechanisms against reactive oxygen species. During charge separation
in photosynthetic reaction centres, triplet states can react with molecular
oxygen generating destructive singlet oxygen. The triplet product yield in
bacteria is... | 1602.01689v1 |
2016-02-12 | Nucleosynthesis in the first massive stars | The nucleosynthesis in the first massive stars may be constrained by
observing the surface composition of long-lived very iron-poor stars born
around 10 billion years ago from material enriched by their ejecta. Many
interesting clues on physical processes having occurred in the first stars can
be obtained just based on... | 1602.04122v1 |
2016-02-15 | Electrical Switching of Magnetization in Films of alpha-Iron with Naturally Hydroxidized Surface | Control of the magnetization vector in ferromagnetic films and
heterostructures by using electric tools instead of external magnetic fields
can lead to low-power memory devices. We observe the robust changes in
magnetization states of a thin (about 30 nm) film of alpha-Fe covered by the
naturally formed layer ( about 6... | 1602.04590v1 |
2016-03-01 | Nuclear medium effects in $F_{2A}^{EM}(x,Q^2)$ and $F_{2A}^{Weak}(x,Q^2)$ structure functions | Recent phenomenological analysis of experimental data on DIS processes
induced by charged leptons and neutrinos/antineutrinos beams on nuclear targets
by CTEQ collaboration has confirmed the observation of CCFR and NuTeV
collaborations, that weak structure function $F_{2A}^{Weak} (x,Q^2)$ is
different from electromagne... | 1603.00164v2 |
2016-03-07 | A new insight into neutrino energy loss by electron capture of iron group nuclei in magnetars surface | Based on the relativistic mean-field effective interactions theory, and Lai
dong model \citep{b37, b38, b39}, we discuss the influences of superstrong
magnetic fields (SMFs) on electron Fermi energy, nuclear blinding energy, and
single-particle level structure in magnetars surface. By using the method of
Shell-Model Mo... | 1603.01898v2 |
2016-03-08 | Quasiparticle scattering interference in iron pnictides: A probe of the origin of nematicity | In this paper, we investigate the quasiparticle scattering interference(QPI)
in the nematic phase of iron pnictides, based on the magnetic and orbital
scenarios of nematicity, respectively. In the spin density wave(SDW) state, the
QPI pattern exhibits a dimer structure in the energy region of the SDW gap,
with its orie... | 1603.02517v2 |
2016-03-09 | Antiferroquadrupolar order and rotational symmetry breaking in a generalized bilinear-biquadratic model on a square lattice | The magnetic and nematic properties of the iron chalcogenides have recently
been the subject of intense interest. Motivated by the proposed
antiferroquadrupolar and Ising-nematic orders for the bulk FeSe, we study the
phase diagram of an $S=1$ generalized bilinear-biquadratic model with
multi-neighbor interactions. We ... | 1603.03027v5 |
2016-03-14 | Strong cooperative coupling of pressure-induced magnetic order and nematicity in FeSe | A hallmark of the iron-based superconductors is the strong coupling between
magnetic, structural and electronic degrees of freedom. However, a universal
picture of the normal state properties of these compounds has been confounded
by recent investigations of FeSe where the nematic (structural) and magnetic
transitions ... | 1603.04135v1 |
2016-03-22 | Thermal Conductivity of the Iron-Based Superconductor FeSe : Nodeless Gap with Strong Two-Band Character | The thermal conductivity of the iron-based superconductor FeSe was measured
at temperatures down to 50 mK in magnetic fields up to 17 T. In zero magnetic
field, the electronic residual linear term in the T = 0 limit, \kappa_0/T, is
vanishingly small. Application of a magnetic field H causes no increase in
\kappa_0/T in... | 1603.06917v1 |
2016-04-01 | Nematic quantum critical point without magnetism in FeSe1-xSx superconductors | The importance of antiferromagnetic fluctuations are widely acknowledged in
most unconventional superconductors. In addition, cuprates and iron pnictides
often exhibit unidirectional (nematic) electronic correlations, including
stripe and orbital orders, whose fluctuations may also play a key role for
electron pairing.... | 1604.00184v2 |
2016-04-05 | Effects of single- and multi-substituted Zn ions in doped-122 type iron-based superconductors | Recent experiments on Zn-substituted 122-type iron-based superconductors
(FeSCs) at electron- and hole- doped region provide us with a testing ground
for understanding the effect of Zn impurities in these systems. Our
first-principle calculations of the electronic structure reveal that the Zn 3d
orbitals are far below ... | 1604.01323v1 |
2016-04-06 | Effect of strain and temperature on the threshold displacement energy in body-centered cubic iron | The threshold displacement energy (TDE) is the minimum amount of kinetic
energy required to displace an atom from its lattice site. The magnitude of the
TDE displays significant variance as a function of the crystallographic
direction, system temperature and applied strain, among a variety of other
factors. It is criti... | 1604.01791v1 |
2016-04-08 | Tribochemistry of graphene on iron and its possible role in lubrication of steel | Recent tribological experiments revealed that graphene is able to lubricate
macroscale steel-on-steel sliding contacts very effectively both in dry and
humid conditions. This effect has been attributed to a mechanical action of
graphene related to its load-carrying capacity. Here we provide further insight
into the fun... | 1604.02306v2 |
2016-04-10 | Quasi-periodic oscillations as a tool for testing the Kerr metric: A comparison with gravitational waves and iron line | QPOs are a common feature in the X-ray power density spectrum of black hole
binaries and a potentially powerful tool to probe the spacetime geometry around
these objects. Here we discuss their constraining power to test the Kerr black
hole hypothesis within the relativistic precession model. We compare our
results with... | 1604.02643v2 |
2016-04-11 | Interatomic Fe-H potential for irradiation and embrittlement simulations | The behavior of hydrogen in iron and iron alloys is of interest in many
fields of physics and materials science. To enable large-scale molecular
dynamics simulations of systems with Fe-H interactions, we develop, based on
density-functional theory calculations, an interatomic Fe-H potential in the
Tersoff-Brenner forma... | 1604.02829v1 |
2016-04-11 | Anomalous carrier density independent superconductivity in iron pnictides | Dome-shape superconductivity phase diagram can commonly be observed in
cuprate and iron-based systems via tuning parameters such as charge carrier
doping, pressure, bond angle, and etc. We report doping electrons from
transition-metal elements (TM = Co, Ni) substitution can induce high-Tc
superconductivity around 35 K ... | 1604.02839v1 |
2016-04-18 | Observation of two distinct superconducting domes under pressure in tetragonal FeS | As the simplest iron-based superconductor, FeSe forms a tetragonal structure
with transition temperature Tc ~ 8 K. With assistance of pressure, or other
techniques, Tc can be greatly enhanced, even to above liquid nitrogen
temperature. The newly discovered superconducting tetragonal FeS (Tc ~ 4.5 K),
a sulfide counterp... | 1604.05254v2 |
2016-04-22 | Temperature-induced band selective localization and coherent-incoherent crossover in single-layer FeSe/Nb:BaTiO3 /KTaO3 | Iron chalcogenide superconductors are multi-band systems with strong electron
correlations. Here we use angle-resolved photoemission spectroscopy to study
band dependent correlation effects in single-layer FeSe/Nb:BaTiO3/KTaO3, a new
iron chalcogenide superconductor with non-degenerate electron pockets and
interface-en... | 1604.06526v1 |
2016-05-12 | The production of proton-rich isotopes beyond iron: The $γ$ process in stars | Beyond iron, a small fraction of the total abundances in the Solar System is
made of proton-rich isotopes, the p nuclei. The clear understanding of their
production is a fundamental challenge for nuclear astrophysics. The p nuclei
constrain the nucleosynthesis in core-collapse and thermonuclear supernovae.
The $\gamma$... | 1605.03690v1 |
2016-06-08 | Large enhancement in high-energy photoionization of Fe XVII and missing continuum plasma opacity | Aimed at solving the outstanding problem of solar opacity, and radiation
transport plasma models in general, we report substantial photoabsorption in
the high-energy regime due to atomic core photo-excitations not heretofore
considered. In extensive R-Matrix calculations of unprecedented complexity for
an important iro... | 1606.02731v1 |
2016-06-09 | Effect of nematic ordering on electronic structure of FeSe | Electronically driven nematic order is often considered as an essential
ingredient of high-temperature superconductivity. Its elusive nature in
iron-based supercon- ductors resulted in a controversy not only as regards its
origin but also as to the degree of its influence on the electronic structure
even in the simples... | 1606.03022v1 |
2016-06-15 | Signature of the Leggett mode in the A1g Raman response: from MgB2 to iron-based superconductors | The Raman response in a superconductor is a powerful probe to investigate the
symmetry of the superconducting gap. Here we show that in a multiband
superconductor it also offers the unique opportunity to establish if the
driving pairing interaction has an intraband or interband character. In the
model with one hole and... | 1606.04784v2 |
2016-06-20 | Nodeless multiband superconductivity in stoichiometric single crystalline CaKFe$_4$As$_4$ | Measurements of the London penetration depth and tunneling conductance in
single crystals of the recently discovered stoicheometric, iron - based
superconductor, CaKFe$_4$As$_4$ (CaK1144) show nodeless, two effective gap
superconductivity with a larger gap of about 6-9 meV and a smaller gap of about
1-4 meV. Having a c... | 1606.06245v1 |
2016-06-28 | Resonant inelastic x-ray scattering study of entangled spin-orbital excitations in superconducting PrFeAsO0.7 | Low-energy electron excitation spectra were measured on a single crystal of a
typical iron-based superconductor PrFeAsO$_{0.7}$ using resonant inelastic
X-ray scattering (RIXS) at the Fe-$L_3$ edge. Characteristic RIXS features are
clearly observed around 0.5, 1-1.5 and 2-3 eV energy losses. These excitations
are analy... | 1606.08917v2 |
2016-07-01 | Oxygen, $α$-element and iron abundance distributions in the inner part of the Galactic thin disc. II | We have derived the abundances of 36 chemical elements in one Cepheid star,
ASAS 181024--2049.6, located R$_{\rm G}= 2.53$ kpc from the Galactic center.
This star falls within a region of the inner thin disc poorly sampled in
Cepheids. Our spectral analysis shows that iron, magnesium, silicon, calcium
and titanium LTE ... | 1607.00129v1 |
2016-07-01 | Evolution of superconducting gap anisotropy in hole-doped 122 iron pnictides | Motivated by recent experimental findings, we investigate the evolution of
the superconducting gap anisotropy in 122 iron pnictides as a function of hole
doping. Employing both a functional and a weak coupling renormalization group
approach (FRG and WRG), we analyse the Fermi surface instabilities of an
effective 122 m... | 1607.00412v1 |
2016-07-03 | First-Principles Momentum Dependent Local Ansatz Approach to the Ground-State Properties of Iron-Group Transition Metals | The ground-state properties of iron-group transition metals from Sc to Cu
have been investigated on the basis of the first-principles momentum dependent
local ansatz (MLA) theory. Correlation energy gain is found to show large
values for Mn and Fe: 0.090 Ry (Mn) and 0.094 Ry (Fe). The Hund-rule coupling
energies are fo... | 1607.00632v1 |
2016-07-07 | Orbital-selective Mott phase of Cu-substituted iron-based Superconductors | We study the phase transition in Cu-substituted iron-based superconductors
with a new developed real-space Green's function method. We find that Cu
substitution has strong effect on the orbital-selective Mott transition
introduced by the Hund's rule coupling. The redistribution of the orbital
occupancy which is caused ... | 1607.01900v1 |
2016-07-11 | Impact of Iron-site defects on Superconductivity in LiFeAs | In conventional s-wave superconductors, only magnetic impurities exhibit
impurity bound states, whereas for an s+- order parameter they can occur for
both magnetic and non-magnetic impurities. Impurity bound states in
superconductors can thus provide important insight into the order parameter.
Here, we present a combin... | 1607.03192v1 |
2016-07-14 | Room temperature polarization in the ferrimagnetic Ga2-xFexO3 ceramics | The effect of the Fe-Ga ratio on the magnetic and electric properties of the
multiferroic Ga2-xFexO3 compound has been studied in order to determine the
composition range exhibiting magnetic and electric orders coexistence and their
critical temperatures. A magnetoelectric phase diagram, showing the evolution
of both t... | 1607.04312v1 |
2016-07-18 | Unified Spin Model for Magnetic Excitations in Iron Chalcogenides | Recent inelastic neutron scattering (INS) measurements on FeSe and
Fe(Te$_{1-x}$Se$_x$), have sparked intense debate over the nature of the ground
state in these materials. Here we propose an effective bilinear-biquadratic
spin model which is shown to consistently describe the evolution of low-energy
spin excitations i... | 1607.05295v3 |
2016-07-28 | Modeling many-body physics with Slave-Spin Mean-Field: Mott and Hund's physics in Fe-superconductors | Slave-spin mean-field theory, a light and accurate technique to model
electronic correlations in Fermi-liquid phases of multi-orbital materials, is
pedagogically exposed in this chapter, with a focus on its recent successful
application to the physics of Iron-based superconductors. Beside introducing
electronic correla... | 1607.08468v1 |
2016-07-31 | Spin resonance peak in Fe-based superconductors with unequal gaps | We study the spin resonance in superconducting state of iron-based materials
within multiband models with two unequal gaps, $\Delta_L$ and $\Delta_S$, on
different Fermi surface pockets. We show that due to the indirect nature of the
gap entering the spin susceptibility at the nesting wave vector $\mathbf{Q}$
the total... | 1608.00245v2 |
2016-08-22 | Nano-scale Inhomogeneous Superconductivity in Fe(Te1-xSex) Probed by Nanostructure-transport | Among iron based superconductors, the layered iron chalcogenide Fe(Te1-xSex)
is structurally the simplest and has attracted considerable attentions. It has
been speculated from bulk studies that nanoscale inhomogeneous
superconductivity may inherently exist in this system. However, this has not
been directly observed f... | 1608.06332v1 |
2016-08-29 | Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides | In this paper we summarize the effects of magnetic and nonmagnetic impurities
on the spin dynamics in Febased superconductors and their parent compounds. The
effects of chemical substitution, vacancies, and disorder on the suppression or
stabilization of superconductivity and spin-density-wave phases are reviewed in
th... | 1608.08123v4 |
2016-09-05 | Cationic Effect on Pressure driven Spin-State Transition and cooperativity in Hybrid Perosvkites | Hybrid or metal organic framework (MOF) perovskites of general composition,
ABX$_3$, are known to show interesting properties which can lead to variety of
technological applications. Our first principles study shows they are also
potential candidates for exhibiting cooperative spin-state transitions upon
application of... | 1609.01020v1 |
2016-09-08 | Block antiferromagnetism and possible ferroelectricity in KFe$_2$Se$_2$ | Superconductors and multiferroics are two of the hottest branches in
condensed matter physics. The connections between those two fields are
fundamentally meaningful to unify the physical rules of correlated electrons.
Recently, BaFe$_2$Se$_3$, was predicted to be multiferroic [Phys. Rev. Lett.
113, 187204 (2014)] due t... | 1609.02614v2 |
2016-09-15 | Highly siderophile elements were stripped from Earth's mantle by iron sulfide segregation | Highly siderophile elements (HSEs) are strongly depleted in the bulk silicate
Earth (BSE) but are present in near-chondritic relative abundances. The
conventional explanation is that the HSEs were stripped from the mantle by the
segregation of metal during core formation but were added back in
near-chondritic proportio... | 1609.04751v1 |
2016-09-16 | A new Measurement of Thermal Conductivity of Iron at high pressures and temperatures | Thermal conductivity of the most abundant element in the planetary core, Iron
(Fe) is measured up to Earth's outer core pressure $\sim 120$ GPa. The
measurements are carried out using the laser heated diamond anvil cell
facility, where the absorbed power by Fe metal foil is calculated using
thermodynamical equation. Th... | 1609.05088v2 |
2016-09-26 | Topology optimized permanent magnet systems | Topology optimization of permanent magnet systems consisting of permanent
magnets, high permeability iron and air is presented. An implementation of
topology optimization for magnetostatics is discussed and three examples are
considered. First, the Halbach cylinder is topology optimized with iron and an
increase of 15%... | 1609.08113v2 |
2016-09-29 | Prediction of superconducting iron-bismuth intermetallic compounds at high pressure | The synthesis of materials in high-pressure experiments has recently
attracted increasing attention, especially since the discovery of record
breaking superconducting temperatures in the sulfur-hydrogen and other
hydrogen-rich systems. Commonly, the initial precursor in a high pressure
experiment contains constituent e... | 1609.09536v1 |
2016-10-26 | Influence of the iron spin crossover in ferropericlase on the lower mantle geotherm | The iron spin crossover in ferropericlase introduces anomalies in its
thermodynamics and thermoelastic properties. Here we investigate how these
anomalies can affect the lower mantle geotherm. The effect is examined in
mantle aggregates consisting of mixtures of bridgmanite, ferropericlase, and
CaSiO$_3$ perovskite, wi... | 1610.08412v2 |
2016-10-27 | Constraining the Kerr parameters via X-ray reflection spectroscopy | In a recent paper [Ghasemi-Nodehi & Bambi, EPJC 76 (2016) 290], we have
proposed a new parametrization for testing the Kerr nature of astrophysical
black hole candidates. In the present work, we study the possibility of
constraining the "Kerr parameters" of our proposal using X-ray reflection
spectroscopy, the so-calle... | 1610.08791v2 |
2016-10-29 | Searching for New Spin-Dependent Interactions with SmCo$_5$ Spin Sources and a SERF Comagnetometer | We propose a novel method to search for possible new macro-scale spin- and/or
velocity-dependent forces (SVDFs) based on specially designed SmCo$_5$ spin
sources and a spin exchange relaxation-free (SERF) comagnetometer. A simulation
shows that, by covering a SmCo$_5$ permanent magnet with a layer of pure iron,
a high ... | 1610.09483v1 |
2016-10-29 | Strong correlations and the search for high-Tc superconductivity in chromium pnictides and chalcogenides | Undoped iron superconductors accommodate $n=6$ electrons in five d-orbitals.
Experimental and theoretical evidence shows that the strength of correlations
increases with hole-doping, as the electronic filling approaches half-filling
with $n=5$ electrons. This evidence delineates a scenario in which the parent
compound ... | 1610.09560v1 |
2016-11-01 | Shear softening of Earth's inner core indicated by its high Poisson's ratio and elastic anisotropy | Earth's inner core exhibits an unusually high Poisson's ratio and noticeable
elastic anisotropy. The mechanisms responsible for these features are critical
for understanding the evolution of the Earth but remain unclear. This study
indicates that once the correct formula for the shear modulus is used, shear
softening c... | 1611.00244v1 |
2016-11-02 | Surface effects on ferromagnetic resonance in magnetic nanocubes | We study the effect of surface anisotropy on the spectrum of spin-wave
excitations in a magnetic nanocluster and compute the corresponding absorbed
power. For this, we develop a general numerical method based on the (undamped)
Landau-Lifshitz equation, either linearized around the equilibrium state
leading to an eigenv... | 1611.00614v1 |
2016-11-08 | Orbital selective pairing and gap structures of iron-based superconductors | We discuss the influence on spin-fluctuation pairing theory of orbital
selective strong correlation effects in Fe-based superconductors, particularly
Fe chalcogenide systems. We propose that a key ingredient for an improved
itinerant pairing theory is orbital selectivity, i.e., incorporating the
reduced coherence of qu... | 1611.02643v2 |
2016-11-09 | A possible new family of unconventional high temperature superconductors | We suggest a new family of Co/Ni-based materials that may host unconventional
high temperature superconductivity (high-T$_c$). These materials carry layered
square lattices with each layer being formed by vertex-shared transition metal
tetrahedra cation-anion complexes. The electronic physics in these materials is
dete... | 1611.02835v1 |
2016-11-21 | Discovery of a novel 112-type iron-pnictide and La-doping induced superconductivity in Eu1-xLaxFeAs2 (x = 0 ~ 0.15) | We report the discovery and characterization of a novel 112-type iron
pnictide EuFeAs2, with La-doping induced superconductivity in a series of
Eu1-xLaxFeAs2. The polycrystalline samples were synthesized through solid state
reaction method only within a very narrow temperature window around 1073 K.
Small single crystal... | 1611.06821v1 |
2016-12-15 | Magnetic excitations in the normal and nematic phases of iron pnictides | In this paper, we study theoretically the behaviors of the magnetic
excitations(MEs) in the normal and nematic phases of iron pnictides. The normal
state MEs exhibit commensurability to diamond and to square-like structure
transition with the increase of energy. This structure transition persists in
the spin and orbita... | 1612.04961v1 |
2016-12-19 | Ultra metal-poor stars: Spectroscopic determination of stellar atmospheric parameters using iron Non-LTE line abundances | We present new ultra-metal-poor (UMP) stars parameters with [Fe/H]<-4.0 based
on line-by-line non-local thermodynamic equilibrium (NLTE) abundances using an
up-to-date iron model atom with a new recipe for non-elastic hydrogen collision
rates. We study the departures from LTE in their atmospheric parameter and show
tha... | 1612.06309v2 |
2016-12-22 | Tunable Finite-Sized Chains to Control Magnetic Relaxation | The magnetic dynamics of low-dimensional iron ion chains have been studied
with regards to the tunable finite-sized chain length using iron phthalocyanine
thin films. The deposition temperature varies the diffusion length during thin
film growth by limiting the average crystal size in the range from 40 to 110
nm. Using... | 1612.07397v1 |
2017-01-03 | Magnetite nano-islands on silicon-carbide with graphene | X-ray magnetic circular dichroism (XMCD) measurements of iron nano-islands
grown on graphene and covered with a Au film for passivation reveal that the
oxidation through defects in the Au film spontaneously leads to the formation
of magnetite nano-particles (i.e, $Fe_3$$O_4$). The Fe nano-islands (20 and 75
monolayers;... | 1701.00861v1 |
2017-01-10 | Ru-doping on iron based pnictides: the "unfolded" dominant role of structural effects for superconductivity | We present an ab-initio study of Ru substitution in two different compounds,
BaFe2As2 and LaFeAsO, pure and F-doped. Despite the many similarities among
them, Ru substitution has very different effects on these compounds. By means
of an unfolding technique, which allows us to trace back the electronic states
into the p... | 1701.02498v1 |
2017-01-18 | Ion beam test results of the Plastic Scintillator Detector of DAMPE | The DArk Matter Particle Explorer (DAMPE) is one of the four satellites
within Strategic Pioneer Research Program in Space Science of the Chinese
Academy of Science (CAS). DAMPE can detect electrons, photons and ions in a
wide energy range (5 GeV to 10 TeV) and ions up to iron (100GeV to 100 TeV).
Plastic Scintillator ... | 1701.04947v2 |
2017-01-20 | Plasma Effects On Atomic Data For The K-Vacancy States Of Highly Charged Iron Ions | The main goal of the present work is to estimate the effects of plasma
environment on the atomic parameters associated with the K-vacancy states in
highly charged iron ions within the astrophysical context of accretion disks
around black holes. In order to do this, multiconfiguration Dirac-Fock
computations have been c... | 1701.05757v1 |
2017-02-01 | Nanoscratching of iron: a novel approach to characterize dislocation microstructures | A new approach for characterizing the dislocation microstructure obtained
from atomistic simulations is introduced, which relies on converting properties
of discrete lines to continuous data. This data is represented by a number of
density and density-like field variables containing detailed information about
propertie... | 1702.00457v3 |
2017-02-02 | Two-temperature equations of state for d-band metals irradiated by femtosecond laser pulses | The cold curves for energy and pressure of Copper, Iron, and Tantalum were
obtained using methods of the density functional theory. We consider
hydrostatic and uniaxial deformations in the range from double compression of
the initial volume per atom to double stretching. The presence of allotropic
transformation from $... | 1702.00825v3 |
2017-02-05 | First-Principles Momentum Dependent Local Ansatz Approach to the Momentum Distribution Function in Iron-Group Transition Metals | The momentum distribution function (MDF) bands of iron-group transition
metals from Sc to Cu have been investigated on the basis of the
first-principles momentum dependent local ansatz wavefunction method. It is
found that the MDF for $d$ electrons show a strong momentum dependence and a
large deviation from the Fermi-... | 1702.01370v1 |
2017-02-07 | Pure iron grains are rare in the universe | The abundant forms in which the major elements in the universe exist have
been determined from numerous astronomical observations and meteoritic
analyses. Iron (Fe) is an exception, in that only depletion of gaseous Fe has
been detected in the interstellar medium, suggesting that Fe is condensed into
a solid, possibly ... | 1702.01921v1 |
2017-02-07 | Anomalous temperature evolution of the electronic structure of FeSe | We present ARPES data taken from the structurally simplest representative of
iron-based superconductors, FeSe, in a wide temperature range. Apart from the
variations related to the nematic transition, we detect very pronounced shifts
of the dispersions on the scale of hundreds of kelvins. Remarkably, upon
warming the s... | 1702.02088v1 |
2017-02-13 | Coexistence of localized and itinerant magnetism in intercalated iron-selenide (Li,Fe)OHFeSe | The electronic structure and magnetism of a new magnetic intercalation
compound (Li0.8Fe0.2)OHFeSe are investigated theoretically. The electronic
structure calculations predict that the Fe in the (Li,Fe)OH intercalated layer
is in +2 valence state, i.e. there is electron doping to the FeSe layer,
resulting in the shrin... | 1702.03845v1 |
2017-02-16 | Thermal and structural properties of iron at high pressure by molecular dynamics | We investigate the basic thermal, mechanical and structural properties of
body centred cubic iron ($\alpha$-Fe) at several temperatures and positive
loading by means of Molecular Dynamics simulations in conjunction with the
embedded-atom method potential and its modified counterpart one. Computations
of its thermal pro... | 1702.04909v1 |
2017-02-20 | Evolution of magnetism in cerium doped LaCo2P2 crystals: a magnetic phase diagram | ThCr2Si2-type phosphide ACo2P2 (A=Rare earth elements) has the same structure
as iron arsenides, but their magnetic behaviors are quite distinct. In this
paper, we for the first time grew a series of La1-xCexCo2P2 single crystals
(x=0.0 to1.0), and made structural and magnetic characterizations. This allows
us to carry... | 1702.05965v1 |
2017-03-20 | Spin-wave excitations in the SDW state of doped iron pnictides | We investigate the spin-wave excitations in the spin-density wave state of
doped iron pnictides within a five-orbital model. We find that the excitations
along ($\pi, 0$)$\rightarrow$($\pi, \pi$) are very sensitive to the doping
whereas they do not exhibit a similar sensitivity along ($0, 0$) $\rightarrow$
($\pi, 0$). ... | 1703.06601v1 |
2017-03-20 | Iron K$α$ line of Kerr black holes with Proca hair | We continue our study on the capabilities of present and future X-ray
missions to test the nature of astrophysical black hole candidates via X-ray
reflection spectroscopy and distinguish Kerr black holes from other solutions
of 4-dimensional Einstein's gravity in the presence of a matter field. Here we
investigate the ... | 1703.06836v2 |
2017-03-20 | Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor | Spin fluctuations are a leading candidate for the pairing mechanism in high
temperature superconductors, supported by the common appearance of a distinct
resonance in the spin susceptibility across the cuprates, iron-based
superconductors and many heavy fermion materials. The information we have about
the spin resonanc... | 1703.07002v2 |
2017-04-05 | Coexistence of magnetism and superconductivity in separate layers of the iron-based superconductor Li_{1-x}Fe_{x}(OH)Fe_{1-y}Se | The magnetic properties attributed to the hydroxide layer of
Li1-xFex(OH)Fe1-ySe have been elucidated by the study of superconducting and
nonsuperconducting members of this family. Both ac magnetometry and muon spin
relaxation measurements of nonsuperconductors find a magnetic state existing
below approximately 10 K wh... | 1704.01492v1 |
2017-04-16 | Highly anisotropic quasiparticle interference patterns in the spin-density wave state of the iron pnictides | We investigate the impurity scattering induced quasiparticle interference in
the ($\pi, 0$) spin-density wave phase of the iron pnictides. We use a five
orbital tight binding model and our mean field theory in the clean limit
captures key features of the Fermi surface observed in angle-resolved
photoemission. We use a ... | 1704.04783v1 |
2017-04-26 | Magnetic Force Microscopy Characterization of Superparamagnetic Iron Oxide Nanoparticles (SPIONs) | Superparamagnetic iron oxide nanoparticles (SPIONs), due to their
controllable sizes, relatively long in vivo half-life and limited
agglomeration, are ideal for biomedical applications such as magnetic labeling,
hyperthermia cancer treatment, targeted drug delivery and for magnetic
resonance imaging (MRI) as contrast e... | 1704.08316v1 |
2017-04-27 | The utility of a Bayesian analysis of complex models and the study of archeological ${}^{14}$C data | The paper presents a critical introduction to the complex statistical models
used in ${}^{14}$C dating. The emphasis is on the estimation of the transit
time between a sequence of archeological layers. Although a frequentist
estimation of the parameters is relatively simple, confidence intervals
constructions are not s... | 1704.08479v1 |
2017-05-15 | Momentum-dependent susceptibilities and magnetic exchange in bcc iron from supercell DMFT calculations | We analyze the momentum- and temperature dependences of the magnetic
susceptibilities and magnetic exchange interaction in paramagnetic bcc iron by
a combination of density functional theory and dynamical mean-field theory
(DFT+DMFT). By considering a general derivation of the orbital-resolved
effective model for spin ... | 1705.05296v2 |
2017-05-15 | Orbital superconductivity, defects and pinned nematic fluctuations in the doped iron chalcogenide FeSe$_{0.45}$Te$_{0.55}$ | We demonstrate that the differential conductance, $dI/dV$, measured via
spectroscopic imaging scanning tunneling microscopy in the doped iron
chalcogenide FeSe$_{0.45}$Te$_{0.55}$, possesses a series of characteristic
features that allow one to extract the orbital structure of the superconducting
gaps. This yields near... | 1705.05384v1 |
2017-05-16 | A large moment antiferromagnetic order in overdoped high-Tc superconductor 154SmFeAsO1-xDx | In iron-based superconductors, high critical temperature (Tc)
superconductivity over 50 K has only been accomplished in electron-doped
hREFeAsO (hRE = heavy rare earth (RE) element). While hREFeAsO has the highest
bulk Tc (58 K), progress in understanding its physical properties has been
relatively slow due to difficul... | 1705.05504v1 |
2017-05-02 | Nesting-induced Local Electronic Patterns around a Single As (Te, Se) Vacancy in Iron-based Superconductors | The local electronic states around a single As (Te, Se) vacancy are
investigated in order to shed light on the role of ligands in a series of
iron-based superconductors. Such a vacancy can produce a local hopping
correction ranging from $-0.22$ eV to 0.12 eV and always induce two in-gap
resonance peaks in the local den... | 1705.06570v1 |
2017-06-06 | A uniform metallicity in the outskirts of massive, nearby galaxy clusters | Suzaku measurements of a homogeneous metal distribution of $Z\sim0.3$ Solar
in the outskirts of the nearby Perseus cluster suggest that chemical elements
were deposited and mixed into the intergalactic medium before clusters formed,
likely over 10 billion years ago. A key prediction of this early enrichment
scenario is... | 1706.01567v2 |
2017-06-06 | Comparison of the Structure Function F2 as Measured by Charged Lepton and Neutrino Scattering from Iron Targets | A comparison study of world data for the structure function F2 for Iron, as
measured by both charged lepton and neutrino scattering experiments, is
presented. Consistency of results for both charged lepton and neutrino
scattering is observed for the full global data set in the valence regime.
Consistency is also observ... | 1706.02002v1 |
2017-06-08 | Characterization of physicochemical and colloidal properties of hydrogel chitosan-coated iron-oxide nanoparticles for cancer therapy | Superparamagnetic iron oxide nanoparticles have recently been investigated
for their potential to kill cancer cells with promising results, owing to their
ability to be targeted and heated by magnetic fields. In this study, novel
hydrogel, chitosan Fe3O4 magnetic nanoparticles were synthesized to induce
magnetic hypert... | 1706.02590v1 |
2017-06-19 | Competing Ferromagnetic and Anti-Ferromagnetic interactions in Iron Nitride $ζ$-Fe$_2$N | The paper discusses the magnetic state of zeta phase of iron nitride viz.
$\zeta$-Fe$_2$N on the basis of spin polarized first principles electronic
structure calculations together with a review of already published data.
Results of our first principles study suggest that the ground state of
$\zeta$-Fe$_2$N is ferromag... | 1706.05879v1 |
2017-06-20 | Spatially resolved Fe K spectroscopy of NGC 4945 | We present the imaging and spectroscopic analysis of the combined Chandra
ACIS-S observations of the Compton-thick Seyfert 2 galaxy NGC 4945. We
performed a spatially-resolved spectroscopy of the circumnuclear environment of
the source, picturing the innermost 200 parsecs around the highly absorbed
nucleus. The additio... | 1706.06362v1 |
2017-06-25 | Local stability and global instability in iron-opaque disks | The thermal stability of accretion disk and the possibility to see a
limit-cycle behaviour strongly depends on the ability of the disk plasma to
cool down. Various processes connected with radiation-matter interaction
appearing in hot accretion disk plasma contribute to opacity. For the case of
geometrically thin and o... | 1706.08180v1 |
2017-06-30 | Achieving DFT accuracy with a machine-learning interatomic potential: thermomechanics and defects in bcc ferromagnetic iron | We show that the Gaussian Approximation Potential machine learning framework
can describe complex magnetic potential energy surfaces, taking ferromagnetic
iron as a paradigmatic challenging case. The training database includes total
energies, forces, and stresses obtained from density-functional theory in the
generaliz... | 1706.10229v1 |
2017-07-13 | Towards the ab initio based theory of the phase transformations in iron and steel | Despite of the appearance of numerous new materials, the iron based alloys
and steels continue to play an essential role in modern technology. The
properties of a steel are determined by its structural state (ferrite,
cementite, pearlite, bainite, martensite, and their combination) that is formed
under thermal treatmen... | 1707.04287v1 |
2017-07-26 | Evidence of Spontaneous Vortex Ground State in An Iron-Based Ferromagnetic Superconductor | Spontaneous vortex phase (SVP) is an exotic quantum matter in which quantized
superconducting vortices form in the absence of external magnetic field.
Although being predicted theoretically nearly 40 years ago, its rigorous
experimental verification still appears to be lacking. Here we present
low-field magnetic measur... | 1707.08420v1 |
2017-07-27 | Impact of Disorder on the Superconducting Phase Diagram in BaFe$_2$(As$_{1-x}$P$_x$)$_2$ | In many classes of unconventional superconductors, the question of whether
the superconductivity is enhanced by the quantum-critical fluctuations on the
verge of an ordered phase remains elusive. One of the most direct ways of
addressing this issue is to investigate how the superconducting dome traces a
shift of the or... | 1707.08670v1 |
2017-08-03 | Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4 | The dynamical spin susceptibility in the new-structure-type iron-based
superconductor CaKFe$_4$As$_4$ was investigated by using a combination of
inelastic neutron scattering (INS) measurements and random phase approximation
(RPA) calculations. Powder INS measurements show that the spin resonance at
$Q_\text{res}=1.17(1... | 1708.01006v2 |
2017-08-09 | Bubble Magnetometry of Nanoparticle Heterogeneity and Interaction | Bubbles have a rich history as transducers in particle-physics experiments.
In a solid-state analogue, we use bubble domains in nanomagnetic films to
measure magnetic nanoparticles. This technique can determine the magnetic
orientation of a single nanoparticle in a fraction of a second, and generate a
full hysteresis l... | 1708.02706v2 |
2017-08-11 | Critical divergence of the symmetric ($A_{1g}$) nonlinear elastoresistance near the nematic transition in an iron-based superconductor | We report the observation of a nonlinear elastoresistivity response for the
prototypical underdoped iron pnictide Ba(Fe$_{0.975}$Co$_{0.025}$)$_2$As$_2$.
Our measurements reveal a large quadratic term in the isotropic ($A_{1g}$)
electronic response that was produced by a purely shear ($B_{2g}$) strain. The
divergence o... | 1708.03682v1 |
2017-08-21 | Solar Line Asymmetries: Modelling the Effect of Granulation on the Solar Spectrum | A parametric model of granulation employing a small number of parameters was
developed. Synthetic spectra calculated using this model closely match observed
spectra and, in particular, reproduce the asymmetries observed in spectral
lines. Both the microturbulent motions and the large-scale flow velocity
decrease expone... | 1708.06408v1 |
2017-08-27 | Electronic and spin dynamics in the insulating iron pnictide NaFe$_{0.5}$Cu$_{0.5}$As | NaFe$_{0.5}$Cu$_{0.5}$As represents a rare exception in the metallic iron
pnictide family, in which a small insulating gap is opened. Based on
first-principles study, we provide a comprehensive theoretical characterization
of this insulating compound. The Fe$^{3+} $spin degree of freedom is quantified
as a quasi-1D $S=... | 1708.08065v1 |
2017-09-09 | Nature of the electromagnetic force between classical magnetic dipoles | The Lorentz force law of classical electrodynamics states that the force F
exerted by the magnetic induction B on a particle of charge q moving with
velocity V is given by F=qVxB. Since this force is orthogonal to the direction
of motion, the magnetic field is said to be incapable of performing mechanical
work. Yet the... | 1709.02921v1 |
2017-09-10 | High pressure growth and electron transport properties of superconducting SmFeAsO1-xHx single crystals | We report the single crystal growth and characterization of the highest Tc
iron-based superconductor SmFeAsO1-xHx. Some sub-millimeter-sized crystals were
grown using the mixture flux of Na3As + 3NaH + As at 3.0 GPa and 1473 K. The
chemical composition analyses confirmed 10% substitution of hydrogen for the
oxygen site... | 1709.03049v1 |
2017-09-08 | Ultrafast carbon monoxide photolysis and heme spin-crossover in myoglobin via nonadiabatic quantum dynamics | Light absorption of myoglobin triggers diatomic ligand photolysis and spin
crossover transition of iron(II) that initiate protein conformational change.
The photolysis and spin crossover reactions happen concurrently on a
femtosecond timescale. The microscopic origin of these reactions remains
controversial. Here, we a... | 1709.03402v4 |
2017-09-26 | Frustrated spin order and stripe fluctuations in FeSe | The charge and spin dynamics of the structurally simplest iron-based
superconductor, FeSe, may hold the key to understanding the physics of high
temperature superconductors in general. Unlike the iron pnictides, FeSe lacks
long range magnetic order in spite of a similar structural transition around
90\,K. Here, we repo... | 1709.08998v3 |
2017-10-18 | Quantum Phase transition under pressure in a heavily hydrogen-doped iron-based superconductor LaFeAsO | Hydrogen (H)-doped LaFeAsO is a prototypical iron-based superconductor.
However, its phase diagram extends beyond the standard framework, where a
superconducting (SC) phase follows an antiferromagnetic (AF) phase upon carrier
doping; instead, the SC phase is sandwiched between two AF phases appearing in
lightly and hea... | 1710.06640v1 |
2017-10-25 | Determination of the Superconducting Order Parameter from Defect Bound State Quasiparticle Interference | The superconducting order parameter is directly related to the pairing
interaction, with the amplitude determined by the interaction strength, while
the phase reflects the spatial structure of the interaction. However, given the
large variety of materials and their rich physical properties within the
iron-based high-Tc... | 1710.09089v1 |
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