publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2014-08-02 | Synthesis and post-annealing effects of alkaline-metal-ethylenediamine-intercalated superconductors Ax(C2H8N2)yFe2-zSe2 (A = Li, Na) with Tc = 45 K | New iron-based intercalation superconductors Ax(C2H8N2)yFe2-zSe2 (A = Li, Na)
with Tc = 45 K have successfully been synthesized via intercalation of
dissolved alkaline metal in ethylenediamine. The c-axis lengths of
Ax(C2H8N2)yFe2-zSe2 (A = Li, Na) are 20.74(7) {\AA} and 21.9(1) {\AA},
respectively, and are about 50 % ... | 1408.0346v1 |
2014-08-06 | Permanent magnet with MgB2 bulk superconductor | Superconductors with persistent zero-resistance currents serve as permanent
magnets for high-field applications requiring a strong and stable magnetic
field, such as magnetic resonance imaging (MRI). The recent global helium
shortage has quickened research into high-temperature superconductors (HTSs)
materials that can... | 1408.1277v1 |
2014-08-08 | Orbital-driven nematicity in FeSe | A very fundamental and unconventional characteristic of superconductivity in
iron-based materials is that it occurs in the vicinity of {\it two} other
instabilities. Apart from a tendency towards magnetic order, these Fe-based
systems have a propensity for nematic ordering: a lowering of the rotational
symmetry while t... | 1408.1875v3 |
2014-08-09 | Stellar origin of the 182Hf cosmochronometer and the presolar history of solar system matter | Among the short-lived radioactive nuclei inferred to be present in the early
solar system via meteoritic analyses, there are several heavier than iron whose
stellar origin has been poorly understood. In particular, the abundances
inferred for 182Hf (half-life = 8.9 million years) and 129I (half-life = 15.7
million year... | 1408.2050v1 |
2014-08-12 | Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2 | Understanding the microscopic origins of electronic phases in high-transition
temperature (high-Tc) superconductors is important for elucidating the
mechanism of superconductivity. In the paramagnetic tetragonal phase of
BaFe2-xTxAs2 (where T is Co or Ni) iron pnictides, an in-plane resistivity
anisotropy has been obse... | 1408.2756v1 |
2014-08-13 | Dynamical correlations and screened exchange on the experimental bench: spectral properties of the cobalt pnictide BaCo2As2 | Understanding the Fermi surface and low-energy excitations of iron or cobalt
pnictides is crucial for assessing electronic instabilities such as magnetic or
superconducting states. Here, we propose and implement a new approach to
compute the low-energy properties of correlated electron materials, taking into
account bo... | 1408.3136v2 |
2014-08-14 | Role of magnetic degrees of freedom in a scenario of phase transformations in steel | The diversity of mesostructures formed in steel at cooling from a
high-temperature austenite ("gamma") phase is determined by the interplay of
shear reconstructions of crystal lattice and diffusion of carbon. Combining
first-principles calculations with large-scale phase-field simulations we
demonstrate a decisive role... | 1408.3275v2 |
2014-08-17 | Interaction between multi components vortices at arbitrary distances using a variational method in the Ginzburg-Landau theory | We study the interaction between the vortices in multi components
superconductors based on the Jacobs and Rebbi variation method using
Ginzburg-Landau theory. With one condensation, we get attraction interaction
between the vortices for type I and repulsion for type II superconductors. With
two condensation states such... | 1408.3834v2 |
2014-08-19 | Anomalous Superconducting-Gap Structure of Slightly Overdoped Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ | We observed the anisotropic superconducting-gap (SC-gap) structure of a
slightly overdoped superconductor, Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$
($x=0.1$), using three-dimensional (3D) angle-resolved photoemission
spectroscopy. Two hole Fermi surfaces (FSs) observed at the Brillouin zone
center and an inner electron FS ... | 1408.4260v1 |
2014-08-25 | Ground state, collective mode, phase soliton and vortex in multiband superconductors | This article reviews theoretical and experimental work on the novel physics
in multiband superconductors. Multiband superconductors are characterized by
multiple superconducting energy gaps in different bands with interaction
between Cooper pairs in these bands. The discovery of prominent multiband
superconductors $\ma... | 1408.5938v2 |
2014-08-26 | Measurement of the Velocity of the Neutrino with MINOS | The MINOS experiment uses a beam of predominantly muon-type neutrinos
generated using protons from the Main Injector at Fermilab in Batavia, IL, and
travelling 735 km through the Earth to a disused iron mine in Soudan, MN. The
10{\mu}s-long beam pulse contains fine time structure which allows a precise
measurement of t... | 1408.6267v1 |
2014-08-29 | The spin of the black hole 4U 1543-47 | We present a new analysis of Rossi X-ray Timing Explorer observations of the
2002 outburst of the transient X-ray nova 4U 1543-47. We focus on observations
in the High/Soft state, and attempt to measure the spin of the black hole by
simultaneously fitting the thermal disk continuum and by modeling the broadened
iron k-... | 1408.7028v1 |
2014-09-01 | Magnetic structure of the Eu2+ moments in superconducting EuFe2(As1-xPx)2 with x = 0.19 | The magnetic structure of the Eu2+ moments in the superconducting
EuFe2(As1-xPx)2 sample with x = 0.19 has been determined using neutron
scattering. We conclude that the Eu2+ moments are aligned along the c direction
below T_C = 19.0(1) K with an ordered moment of 6.6(2) mu_B in the
superconducting state. An impurity p... | 1409.0432v1 |
2014-09-07 | Quantum Monte Carlo study of the $S_4$ symmetric microscopic model for iron-based superconductors | The $S_4$ symmetric microscopic model with two iso-spin components has been
studied via constrained-path quantum Monte Carlo simulation. Our results
demonstrate a stable $(\pi,0)$ or $(0,\pi)$ magnetic order which is
significantly enhanced on increasing both the Coulomb repulsion $U$ and Hund's
coupling strength $J$. A... | 1409.2075v1 |
2014-09-08 | The sensitivity of the ICAL detector at India-based Neutrino Observatory to neutrino oscillation parameters | The India-based Neutrino Observatory (INO) will host a 50 kt magnetized iron
calorimeter (ICAL) detector that will be able to detect muon tracks and hadron
showers produced by Charged-Current muon neutrino interactions in the detector.
The ICAL experiment will be able to determine the precision of atmospheric
neutrino ... | 1409.2231v1 |
2014-09-09 | Anomalous density of states in multiband superconductors near Lifshitz transition | We consider a multiband metal with deep primary bands and a shallow secondary
one. In the normal state the system undergoes Lifshitz transition when the
bottom of the shallow band crosses the Fermi level. In the superconducting
state Cooper pairing in the shallow band is induced by the deep ones. As a
result, the densi... | 1409.2807v2 |
2014-09-09 | The diversity of quasars unified by accretion and orientation | Quasars are rapidly accreting supermassive black holes at the center of
massive galaxies. They display a broad range of properties across all
wavelengths, reflecting the diversity in the physical conditions of the regions
close to the central engine. These properties, however, are not random, but
form well-defined tren... | 1409.2887v1 |
2014-09-10 | Theoretical investigation of the electronic and magnetic properties of the orthorhombic phase of Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ | We present a comprehensive study on the low-temperature orthorhombic phase of
Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ based on the Korringa-Kohn-Rostoker-Green
function approach. Using this bandstructure method in combination with the
coherent potential approximation alloy theory we are able to investigate the
evolution of the ... | 1409.3099v1 |
2014-09-10 | On the Raman O VI and related lines in classical novae | We critically examine the recent claimed detection of Raman scattered O VI at
around 6830\AA\ in the iron curtain stage spectra of the classical CO nova V339
Del. The observed line variations are compatible in profile and timing of
emission line strength with an excited state transition of neutral carbon. Line
formatio... | 1409.3240v1 |
2014-09-11 | Effects of applied strain on radiation damage generation in body-centered cubic iron | Radiation damage in body-centered cubic (BCC) Fe has been extensively studied
by computer simulations to quantify effects of temperature, impinging particle
energy, and the presence of extrinsic particles. However, limited investigation
has been conducted into the effects of mechanical stresses and strain. In a
reactor... | 1409.3519v2 |
2014-09-13 | Coexistence of 3d-ferromagnetism and superconductivity in [(Li(1-x)Fex)OH](Fe(1-y)Liy)Se | Superconducting [(Li(1-x)Fex)OH](Fe(1-y)Liy)Se (x ~ 0.2, y ~ 0.08) was
synthesized by hydrothermal methods and structurally characterized by single
crystal X-ray diffraction. The crystal structure contains anti-PbO type
(Fe(1-y)Liy)Se layers separated by layers of (Li(1-x)Fex)OH. Electrical
resistivity and magnetic sus... | 1409.3982v1 |
2014-09-14 | Soft striped magnetic fluctuations competing with superconductivity in Fe_{1+x}Te | Neutron spectroscopy is used to investigate the magnetic fluctuations in
Fe_{1+x}Te - a parent compound of chalcogenide superconductors. Incommensurate
"stripe-like" excitations soften with increased interstitial iron
concentration. The energy crossover from incommensurate to stripy fluctuations
defines an apparent hou... | 1409.4051v1 |
2014-09-16 | Inverse problem for extragalactic transport of ultra-high energy cosmic rays | The energy spectra and composition of ultra-high energy cosmic rays are
changing in a course of propagation in the expanding Universe filled with
background radiation. We developed a numerical code for solution of inverse
problem for cosmic-ray transport equations that allows the determination of
average source spectra... | 1409.4654v4 |
2014-09-17 | Increased magnetocrystalline anisotropy in epitaxial Fe-Co-C thin films with spontaneous strain | Rare earth free alloys are in focus of permanent magnet research since the
accessibility of the elements needed for nowadays conventional magnets is
limited. Tetragonally strained iron-cobalt (Fe-Co) has attracted large interest
as promising candidate due to theoretical calculations. In experiments,
however, the applie... | 1409.4952v1 |
2014-09-25 | Characterisation of Glass Electrodes and RPC Detectors for $INO-ICAL$ Experiment | India-based Neutrino Observatory (INO) is a planned neutrino experiment to be
build up in southern part of India.The INO observatory will host a 51 kton Iron
Calorimeter (ICAL) detector to detect atmospheric neutrinos. Resistive Plate
Chamber (RPC) has been chosen as the active detector element for the ICAL
experiment.... | 1409.7184v1 |
2014-09-26 | Superconducting gap structure of BaFe_2(As_{1-x}P_{x})_2 | We present a study of the superconducting gap structure in the iron-pnictide
series BaFe2(As1-xPx)2. By measuring the variation of the specific heat as a
function of temperature and magnetic field we are able to determine the number
and Fermi surface location of the nodes in the superconducting gap. In
particular, from... | 1409.7523v1 |
2014-09-30 | Observation of an electron band above the Fermi level in FeTe$_{0.55}$Se$_{0.45}$ from \emph{in-situ} surface doping | We used \emph{in-situ} potassium (K) evaporation to dope the surface of the
iron-based superconductor FeTe$_{0.55}$Se$_{0.45}$. The systematic study of the
bands near the Fermi level confirms that electrons are doped into the system,
allowing us to tune the Fermi level of this material and to access otherwise
unoccupie... | 1409.8383v2 |
2014-09-30 | Testing non-standard neutrino matter interactions in atmospheric neutrino propagation | We study the effects of non-standard interactions on the oscillation pattern
of atmospheric neutrinos. We use neutrino oscillograms as our main tool to
infer the role of non-standard interactions (NSI) parameters at the probability
level in the energy range, $E \in [1,20]$ GeV and zenith angle range, $\cos
\theta \in [... | 1409.8472v2 |
2014-10-02 | Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor | Majorana fermions are predicted to localize at the edge of a topological
superconductor, a state of matter that can form when a ferromagnetic system is
placed in proximity to a conventional superconductor with strong spin-orbit
interaction. With the goal of realizing a one-dimensional topological
superconductor, we hav... | 1410.0682v1 |
2014-10-03 | Unexpected impact of magnetic disorder on multiband superconductivity | We analyze how the magnetic disorder affects the properties of the two-band
$s_\pm$ and $s_{++}$ models, which are subject of hot discussions regarding
iron-based superconductors and other multiband systems like MgB$_2$. We show
that there are several cases when the transition temperature $T_c$ is not fully
suppressed ... | 1410.0832v2 |
2014-10-13 | [$α$/Fe] Abundances of Four Outer M 31 Halo Stars | We present alpha element to iron abundance ratios, [$\alpha$/Fe], for four
stars in the outer stellar halo of the Andromeda Galaxy (M 31). The stars were
identified as high-likelihood field halo stars by Gilbert et al. (2012) and lie
at projected distances between 70 and 140 kpc from M 31's center. These are the
first ... | 1410.3475v1 |
2014-10-17 | Influence of Electron-Impact Multiple Ionization on Equilibrium and Dynamic Charge State Distributions: A Case Study Using Iron | We describe the influence of electron-impact multiple ionization (EIMI) on
the ionization balance of collisionally ionized plasmas. We are unaware of any
previous ionization balance calculations that have included EIMI, which is
usually assumed to be unimportant. Here, we incorporate EIMI cross-section data
into calcul... | 1410.4850v1 |
2014-10-20 | Sensitivity for detection of decay of dark matter particle using ICAL at INO | We report on the simulation studies on the possibility of dark matter
particle (DMP) decaying into leptonic modes. While not much is known about the
properties of dark matter particles except through their gravitational effect,
it has been recently conjectured that the so called "anomalous Kolar Events"
observed some d... | 1410.5182v1 |
2014-10-21 | Possible superconductivity in Sr$_{2}$IrO$_{4}$ probed by quasiparticle interference | Based on the possible superconducting (SC) pairing symmetries recently
proposed, the quasiparticle interference (QPI) patterns in electron- and
hole-doped Sr$_{2}$IrO$_{4}$ are theoretically investigated. In the
electron-doped case, the QPI spectra can be explained based on a model similar
to the octet model of the cup... | 1410.5512v2 |
2014-10-23 | Superconductivity and phase instability of NH3-free Na-intercalated FeSe1-zSz | The discovery of ThCr2Si2-type AxFe2-ySe2 (A = K, Rb, Cs and Tl) with Tc ~
30K make much progress in iron-based superconducting field, but their
multiple-phase separations are disadvantageous for understanding the origin. On
the other hand, for small alkali metals, studies on (Li,Na)FeCu(S,Se)2 and
NaFe2-{\delta}S2 sho... | 1410.6385v1 |
2014-10-27 | Charge Dynamics in a Correlated Fermion System on a Geometrically Frustrated Lattice | Charge dynamics in an interacting fermionic model on a geometrically
frustrated lattice are examined. We analyze a spinless fermion model on a
paired triangular lattice, an electronic model for layered iron oxides, in zero
and finite temperatures by the exact diagonalization methods. We focus on the
two charge ordered ... | 1410.7218v1 |
2014-10-27 | Eight billion asteroids in the Oort cloud | The Oort cloud is usually thought of as a collection of icy comets inhabiting
the outer reaches of the Solar system, but this picture is incomplete. We use
simulations of the formation of the Oort cloud to show that ~4% of the small
bodies in the Oort cloud should have formed within 2.5 au of the Sun, and hence
be ice-... | 1410.7403v1 |
2014-10-28 | Unified picture of the doping dependence of superconducting transition temperatures in alkali metal/ammonia intercalated FeSe | In the recently synthesized Li$_x$(NH$_2$)$_y$(NH$_3$)$_z$Fe$_2$Se$_2$ family
of iron chalcogenides a molecular spacer consisting of lithium ions, lithium
amide and ammonia separates layers of FeSe. It has been shown that upon
variation of the chemical composition of the spacer layer, superconducting
transition tempera... | 1410.7565v3 |
2014-10-30 | Detection of Neutral Phosphorus in the Near Ultraviolet Spectra of Late-Type Stars | We report the detection of several absorption lines of neutral phosphorus (P,
Z=15) in archival near ultraviolet spectra obtained with the Space Telescope
Imaging Spectrograph on board the Hubble Space Telescope. We derive phosphorus
abundances or interesting upper limits in 14 late-type stars with metallicities
spanni... | 1410.8539v1 |
2014-11-01 | Glide-Plane Symmetry and Superconducting Gap Structure of Iron-Based Superconductors | We consider the effect of glide-plane symmetry of the Fe-pnictogen/chalcogen
layer in Fe-based superconductors on pairing in spin fluctuation models. Recent
theories have proposed that so-called $\eta$-pairing states with nonzero total
momentum can be realized and possess exotic properties such as odd parity spin
singl... | 1411.0070v2 |
2014-11-04 | In-plane magnetic field vs. temperature phase diagram of a quasi-2D frustrated multiband superconductor | Motivated by the recent discovery of iron-based superconductors, with high
critical temperatures and multiple bands crossing the Fermi level, we address
the conditions for the presence of chiral superconducting phases configurations
in the in-plane magnetic field vs. temperature phase diagram of a quasi-2D
frustrated t... | 1411.0937v2 |
2014-11-12 | Spontaneous Breakdown of Time-Reversal Symmetry Induced by Thermal Fluctuations | In systems with broken $U(1)$ symmetry, such as superfluids, superconductors
or magnets, the symmetry restoration is driven by proliferation of topological
defects in the form of vortex loops. Here we discuss that in certain systems
the proliferation of topological defects can, by contrast, lead to the
breakdown of an ... | 1411.3202v2 |
2014-11-14 | The impact of global nuclear mass model uncertainties on $r$-process abundance predictions | Rapid neutron capture or `$r$-process' nucleosynthesis may be responsible for
half the production of heavy elements above iron on the periodic table. Masses
are one of the most important nuclear physics ingredients that go into
calculations of $r$-process nucleosynthesis as they enter into the calculations
of reaction ... | 1411.3973v1 |
2014-11-14 | A mini review on NiFe-based materials as highly active oxygen evolution reaction electrocatalysts | Oxygen evolution reaction (OER) electrolysis, as an important reaction
involved in water splitting and rechargeable metal-air battery, has attracted
increasing attention for clean energy generation and efficient energy storage.
Nickel/iron (NiFe)-based compounds have been known as active OER catalysts
since the last ce... | 1411.4677v1 |
2014-11-19 | Stability and magnetization of free-standing and graphene-embedded iron membranes | Inspired by recent experimental realizations of monolayer Fe membranes in
graphene perforations, we perform ab initio calculations of Fe monolayers and
membranes embedded in graphene in order to assess their structural stability
and magnetization. We demonstrate that monolayer Fe has a larger spin
magnetization per ato... | 1411.5193v1 |
2014-11-19 | Structural ${γ\textrm{-}\varepsilon}$ phase transition in Fe-Mn alloys from CPA+DMFT approach | We present a computational scheme for total energy calculations of disordered
alloys with strong electronic correlations. It employs the coherent potential
approximation combined with the dynamical mean-field theory and allows one to
study the structural transformations. The material-specific Hamiltonians in the
Wannie... | 1411.5356v3 |
2014-11-19 | Interplay between Kondo effect and Ruderman-Kittel-Kasuya-Yosida interaction | The interplay between the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction
and the Kondo effect is expected to provide the driving force for the emergence
of many phenomena in strongly correlated electron materials. Two magnetic
impurities in a metal are the smallest possible system containing all these
ingredients and... | 1411.5388v1 |
2014-11-25 | Quantum critical elasticity | We discuss elastic instabilities of the atomic crystal lattice at zero
temperature. Due to long-range shear forces of the solid, at such transitions
the phonon velocities vanish, if at all, only along certain crystallographic
directions, and, consequently, the critical phonon fluctuations are suppressed
to a lower dime... | 1411.6925v3 |
2014-11-26 | Effect of bombarding steel with Xe$^+$ ions on the surface nanostructure and on pulsed plasma nitriding process | The modification of steel (AISI 316L and AISI 4140) surface morphology and
underlying inter-crystalline grains strain due to Xe$^+$ ion bombardment are
reported to affect nitrogen diffusion after a pulsed plasma nitriding process.
The ion bombardment induces regular nanometric patterns and increases the
roughness of th... | 1411.7281v1 |
2014-11-27 | Competing superconducting and magnetic order parameters and field-induced magnetism in electron doped Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ | We have studied the magnetic and superconducting properties of
Ba(Fe$_{0.95}$Co$_{0.05}$)$_{2}$As$_{2}$ as a function of temperature and
external magnetic field using neutron scattering and muon spin rotation. Below
the superconducting transition temperature the magnetic and superconducting
order parameters coexist and... | 1411.7506v1 |
2014-12-09 | An extreme gravitationally redshifted iron line at 4.8 keV in Mrk 876 | X-ray spectral lines at unforeseen energies are important because they can
shed light on the extreme physical conditions of the environment around the
supermassive black holes of active galactic nuclei (AGN). Mrk 876 displays such
a line at 4.8 keV rest-frame energy. A possible interpretation of its origin
can be found... | 1412.3112v1 |
2014-12-10 | M{ö}ssbauer characterization of an unusual high-spin side-on peroxo-Fe3+ species in the active site of superoxide reductase from Desulfoarculus Baarsii. Density functional calculations on related models | Superoxide reductase (SOR) is an Fe protein that catalyzes the reduction of
superoxide to give H(2)O(2). Recently, the mutation of the Glu47 residue into
alanine (E47A) in the active site of SOR from Desulfoarculus baarsii has
allowed the stabilization of an iron-peroxo species when quickly reacted with
H(2)O(2) [Math{... | 1412.3293v1 |
2014-12-10 | Topological Characters in Fe(Te$_{1-x}$Se$_x$) thin films | We investigate topological properties in the Fe(Te,Se) thin films. We find
that the single layer FeTe$_{1-x}$Se$_x$ has nontrivial $Z_2$ topological
invariance which originates from the parity exchange at $\Gamma$ point of
Brillouin zone. The nontrivial topology is mainly controlled by the Te(Se)
height. Adjusting the ... | 1412.3375v1 |
2014-12-11 | Transition-Metal Substitutions in Iron Chalcogenides | The $ab$-plane resistivity and Hall effect are studied in
Fe$_{1-y}$M$_y$Te$_{0.65}$Se$_{0.35}$ single crystals doped with two transition
metal elements, M = Co or Ni, over a wide doping range, $0 \leq y \leq 0.2$.
The superconducting transition temperature, $T_{c}$, reaches zero for Co at $y
\simeq 0.14$ and for Ni at... | 1412.3599v1 |
2014-12-15 | The hard X-ray spectrum of NGC 5506 as seen by NuSTAR | NuSTAR observed the bright Compton-thin, narrow line Seyfert 1 galaxy, NGC
5506, for about 56 ks. In agreement with past observations, the spectrum is
well fit by a power law with Gamma~1.9, a distant reflection component and
narrow ionized iron lines. A relativistically blurred reflection component is
not required by ... | 1412.4541v1 |
2014-12-19 | [(Li0.8Fe0.2)OH]FeS and the ferromagnetic superconductors [(Li0.8Fe0.2)OH]Fe(S1-xSex) (0<x<1) | [(Li0.8Fe0.2)OH]FeS and the series [(Li0.8Fe0.2)OH]Fe(S1-xSex) (0<x<1) were
synthesized by hydrothermal methods and characterized by X-ray single crystal
and powder diffraction, EDX and chemical analysis. Selenium-rich compounds show
the coexistence of magnetic ordering with superconductivity known from the pure
seleni... | 1412.6475v1 |
2014-12-19 | Red Supergiant Stars as Cosmic Abundance Probes. III. NLTE effects in J-band Magnesium lines | Non-LTE calculations for Mg I in red supergiant stellar atmospheres are
presented to investigate the importance of non-LTE for the formation of Mg I
lines in the NIR J-band. Recent work using medium resolution spectroscopy of
atomic lines in the J-band of individual red supergiant stars has demonstrated
that technique ... | 1412.6527v2 |
2014-12-22 | Superconductivity-induced reentrance of orthorhombic distortion in Ba1-xKxFe2As2 | Detailed knowledge of the phase diagram and the nature of the competing
magnetic and superconducting phases is imperative for an understanding of the
physics of iron-based superconductivity. Here, we show using thermodynamic
probes that the phase diagram of the first discovered, and highest Tc, 122-type
material, Ba1-x... | 1412.7038v2 |
2014-12-23 | Tuning the magnetic anisotropy of single molecules | The magnetism of single atoms and molecules is governed by the atomic scale
environment. In general, the reduced symmetry of the surrounding splits the $d$
states and aligns the magnetic moment along certain favorable directions. Here,
we show that we can reversibly modify the magnetocrystalline anisotropy by
manipulat... | 1412.7454v2 |
2014-12-30 | GPU-based acceleration of free energy calculations in solid state physics | Obtaining a thermodynamically accurate phase diagram through numerical
calculations is a computationally expensive problem that is crucially important
to understanding the complex phenomena of solid state physics, such as
superconductivity. In this work we show how this type of analysis can be
significantly accelerated... | 1412.8754v2 |
2014-12-31 | La$_2$O$_3$Fe$_2$Se$_2$, a Mott insulator on the brink of orbital-selective metalization | La$_2$O$_3$Fe$_2$Se$_2$ can be explained in terms of Mott localization in
sharp contrast with the metallic behavior of FeSe and other parent parent
compounds of iron superconductors. We demonstrate that the key ingredient that
makes La$_2$O$_3$Fe$_2$Se$_2$ a Mott insulator, rather than a correlated metal
dominated by t... | 1501.00118v1 |
2015-01-02 | Mott-Kondo Insulator Behavior in the Iron Oxychalcogenides | We perform a combined experimental-theoretical study of the
Fe-oxychalcogenides (FeO$\emph{Ch}$) series
La$_{2}$O$_{2}$Fe$_{2}$O\emph{M}$_{2}$ (\emph{M}=S, Se), which is the latest
among the Fe-based materials with the potential \ to show unconventional
high-T$_{c}$ superconductivity (HTSC). A combination of incoherent... | 1501.00332v1 |
2015-01-02 | Magnetism in Quasi-One-Dimensional A$_2$Cr$_3$As$_3$ (A=K,Rb) superconductors | We predict that the recently discovered quasi-one dimensional
superconductors, A$_2$Cr$_3$As$_3$(A=K,Rb), possess strong frustrated magnetic
fluctuations and are nearby a novel in-out co-planar magnetic ground state. The
frustrated magnetism is very sensitive to c-axis lattice constant and can thus
be suppressed by inc... | 1501.00412v2 |
2015-01-03 | Single Phase Synthesis and Room temperature Neutron Diffraction Studies on Multiferroic PbFe0.5Nb0.5O3 | The Lead-iron-niobate, (PbFe0.5Nb0.5O3 or PFN) was synthesized by low
temperature sintering Single Step / Solid State Reaction Method. The 700 C / 2
hrs calcined powder was sintered at 1050 C / 1 hr. The sintered pellets were
characterized through X-Ray Diffraction and Neutron Diffraction at room
temperature. It is fou... | 1501.00553v1 |
2015-01-05 | Nematicity and quantum paramagnetism in FeSe | In common with other iron-based high temperature superconductors, FeSe
exhibits a transition to a ``nematic'' phase below 90Kelvin in which the
crystal rotation symmetry is spontaneously broken. However, the absence of
strong low-frequency magnetic fluctuations near or above the transition has
been interpreted as imply... | 1501.00844v2 |
2015-01-05 | A novel platform for two-dimensional chiral topological superconductivity | We show that the surface of an $s$-wave superconductor decorated with a
two-dimensional lattice of magnetic impurities can exhibit chiral topological
superconductivity. If impurities order ferromagnetically and the
superconducting surface supports a sufficiently strong Rashba-type spin-orbit
coupling, Shiba sub-gap sta... | 1501.00999v1 |
2015-01-07 | Pulse radiolysis studies on superoxide reductase from Treponema pallidum | Superoxide reductases (SORs) are small metalloenzymes, which catalyze
reduction of O2*- to H2O2. The reaction of the enzyme from Treponema pallidum
with superoxide was studied by pulse radiolysis methods. The first step is an
extremely fast bi-molecular reaction of the ferrous center with O2, with a rate
constant of 6 ... | 1501.01443v1 |
2015-01-07 | The flavin reductase ActVB from Streptomyces coelicolor: characterization of the electron transferase activity of the flavoprotein form | The flavin reductase ActVB is involved in the last step of actinorhodin
biosynthesis in Streptomyces coelicolor. Although ActVB can be isolated with
some FMN bound, this form was not involved in the flavin reductase activity. By
studying the ferric reductase activity of ActVB, we show that its FMN-bound
form exhibits a... | 1501.01465v1 |
2015-01-07 | Identification of iron(III) peroxo species in the active site of the superoxide reductase SOR from Desulfoarculus baarsii | The active site of superoxide reductase SOR consists of an Fe2+ center in an
unusual [His4 Cys1] square-pyramidal geometry. It specifically reduces
superoxide to produce H2O2. Here, we have reacted the SOR from Desulfoarculus
baarsii directly with H2O2. We have found that its active site can transiently
stabilize an Fe... | 1501.01470v1 |
2015-01-07 | Maximum screening fields of superconducting multilayer structures | It is shown that a multilayer comprised of alternating thin superconducting
and insulating layers on a thick substrate can fully screen the applied
magnetic field exceeding the superheating fields $H_s$ of both the
superconducting layers and the substrate, the maximum Meissner field is
achieved at an optimum multilayer... | 1501.01512v1 |
2015-01-08 | Sulfurization of Iron in the Dynamic Solar Nebula and Implications for Planetary Compositions | One explanation for the enhanced ratio of volatiles to hydrogen in Jupiter's
atmosphere compared to a a gas of solar composition is that the planet accreted
volatile-bearing clathrates during its formation. Models, however, suggest that
S would be over abundant if clathrates were the primary carrier of Jupiter's
volati... | 1501.01878v1 |
2015-01-09 | Study of the chemical composition of high energy cosmic rays using the muon LDF of EAS between $10^{17.25}$ eV and $10^{17.75}$ eV | We explore the feasibility of estimating primary cosmic ray composition at
high energies from the study of two parameters of Extensive Air Showers (EAS)
at ground and underground level with Monte Carlo simulations using the new EPOS
and QGSJETII hadronic models tuned with LHC data. Namely, the slope and density
at a gi... | 1501.02217v1 |
2015-01-11 | Hidden Order as a Source of Interface Superconductivity | Interfacial superconductivity is observed in a variety of heterostructures
composed of different materials including superconducting and
nonsuperconducting (at appropriate doping and temperatures) cuprates and
iron-based pnictides. The origin of this superconductivity remains in many
cases unclear. Here, we propose a g... | 1501.02505v2 |
2015-01-16 | Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO | Among the widely studied superconducting iron-pnictide compounds belonging to
the Ln1111 family (with Ln a lanthanide), a systematic investigation of the
crossover region between the superconducting and the antiferromagnetic phase
for the Ln = Nd case has been missing. We fill this gap by focusing on the
intermediate d... | 1501.04005v1 |
2015-01-19 | Raman scattering in superconducting NdO1-xFxBiS2 crystals | The recently discovered layered BiS2-based superconductors have attracted a
great deal of interest due to their structural similarity to cuprate and
iron-pnictide superconductors. We have performed Raman scattering measurements
on two superconducting crystals NdO0.5F0.5BiS2 (Tc = 4.5 K) and NdO0.7F0.3BiS2
(Tc = 4.8 K).... | 1501.04453v2 |
2015-01-20 | Shape optimization of an electric motor subject to nonlinear magnetostatics | The goal of this paper is to improve the performance of an electric motor by
modifying the geometry of a specific part of the iron core of its rotor. To be
more precise, the objective is to smooth the rotation pattern of the rotor. A
shape optimization problem is formulated by introducing a tracking-type cost
functiona... | 1501.04752v1 |
2015-01-25 | Sensorless Battery Internal Temperature Estimation using a Kalman Filter with Impedance Measurement | This study presents a method of estimating battery cell core and surface
temperature using a thermal model coupled with electrical impedance
measurement, rather than using direct surface temperature measurements. This is
advantageous over previous methods of estimating temperature from impedance,
which only estimate th... | 1501.06160v1 |
2015-01-26 | Measurement of the chemical composition of the ultra-high-energy cosmic rays with the Pierre Auger Observatory | The Pierre Auger Observatory infers the chemical composition of
ultra-high-energy cosmic rays through two independent detection techniques. The
Fluorescence Detector (FD) measures the longitudinal profile of high energy air
showers and can determine the depth of the shower maximum $X_{max}$, which is
sensitive to the c... | 1501.06325v1 |
2015-01-28 | The Bubble-like Interior of the Core-Collapse Supernova Remnant Cassiopeia A | The death of massive stars is believed to involve aspheric explosions
initiated by the collapse of an iron core. The specifics of how these
catastrophic explosions proceed remain uncertain due, in part, to limited
observational constraints on various processes that can introduce asymmetries
deep inside the star. Here w... | 1501.07283v1 |
2015-02-02 | Cold condensation of dust in the ISM | The condensation of complex silicates with pyroxene and olivine composition
at conditions prevailing in molecular clouds has been experimentally studied.
For this purpose, molecular species comprising refractory elements were forced
to accrete on cold substrates representing the cold surfaces of surviving dust
grains i... | 1502.00388v1 |
2015-02-04 | Is inner core seismic anisotropy a marker of plastic flow of cubic iron? | This paper investigates whether observations of seismic anisotropy are
compatible with a cubic structure of the inner core Fe alloy. We assume that
anisotropy is the result of plastic deformation within a large scale flow
induced by preferred growth at the inner core equator. Based on elastic moduli
from the literature... | 1502.01270v1 |
2015-02-05 | Code intercomparison and benchmark for muon fluence and absorbed dose induced by an 18-GeV electron beam after massive iron shielding | In 1974, Nelson, Kase, and Svenson published an experimental investigation on
muon shielding using the SLAC high energy LINAC. They measured muon fluence and
absorbed dose induced by a 18 GeV electron beam hitting a copper/water beam
dump and attenuated in a thick steel shielding. In their paper, they compared
the resu... | 1502.01681v1 |
2015-02-18 | UV spectra of iron-doped carbon clusters FeC_n n = 3-6 | Electronic transitions of jet-cooled FeC$_n$ clusters ($n = 3 - 6$) were
measured between 230 and 300 nm by a mass-resolved 1+1 resonant two-photon
ionization technique. Rotational profiles were simulated based on previous
calculations of ground state geometries and compared to experimental
observations. Reasonable agr... | 1502.05310v1 |
2015-02-19 | Low 60Fe abundance in Semarkona and Sahara 99555 | Iron-60 (t1/2=2.62 Myr) is a short-lived nuclide that can help constrain the
astrophysical context of solar system formation and date early solar system
events. A high abundance of 60Fe (60Fe/56Fe= 4x10-7) was reported by in situ
techniques in some chondrules from the LL3.00 Semarkona meteorite, which was
taken as evid... | 1502.05611v1 |
2015-02-20 | Magnetic and Dielectric Properties of Multiferroic BiFeO3 Nanoparticles Synthesized by a Novel Citrate Combustion Method | Single phase BiFeO3 nanoparticles have been successfully synthesized for the
first time by a novel citrate combustion method without using any solvent. Well
mixed metal nitrates along with citric acid which is used as fuel combust to
give BiFeO3 nanoparticles after annealing. These particles are single phase in
nature ... | 1502.05797v1 |
2015-02-21 | Spin liquid polymorphism in a correlated electron system on the threshold of superconductivity | We report neutron scattering measurements, which reveal spin-liquid
polymorphism in a '11' iron chalcogenide superconductor, a poorly-metallic
magnetic FeTe tuned towards superconductivity by substitution of a small amount
of Tellurium with iso-electronic Sulphur. We observe liquid-like magnetic
dynamics, which is desc... | 1502.06051v1 |
2015-02-25 | HD188112: Supernova Ia progenitor? | HD188112 is an extremely low mass white dwarf in a close binary system.
According to a previous study, the mass of HD188112 is $\sim$0.24 Msun and a
lower limit of 0.73 Msun could be put for the mass of its unseen companion, a
compact degenarate object. We used HST STIS spectra to measure the rotational
broadening of U... | 1502.07096v1 |
2015-02-25 | Electron capture cross sections for stellar nucleosynthesis | In the first stage of this work, we perform detailed calculations for the
cross sections of the electron capture on nuclei under laboratory conditions.
Towards this aim we exploit the advantages of a refined version of the
proton-neutron quasi-particle random-phase approximation (pn-QRPA) and carry
out state-by-state e... | 1502.07225v1 |
2015-02-27 | Doping evolution of antiferromagnetism and transport properties in the non-superconducting BaFe2-2xNixCrxAs2 | We report elastic neutron scattering and transport measurements on the Ni and
Cr equivalently doped iron pnictide BaFe$_{2-2x}$Ni$_{x}$Cr$_{x}$As$_{2}$.
Compared with the electron-doped BaFe$_{2-x}$Ni$_{x}$As$_{2}$, the long-range
antiferromagnetic (AF) order in BaFe$_{2-2x}$Ni$_{x}$Cr$_{x}$As$_{2}$ is
gradually suppre... | 1502.07950v1 |
2015-02-27 | Is HE 0436-4717 Anemic? A deep look at a bare Seyfert 1 galaxy | A multi-epoch, multi-instrument analysis of the Seyfert 1 galaxy HE 0436-4717
is conducted using optical to X-ray data from XMM-Newton and Swift (including
the BAT). Fitting of the UV-to-X-ray spectral energy distribution shows little
evidence of extinction and the X-ray spectral analysis does not confirm
previous repo... | 1502.07958v1 |
2015-03-03 | Magnetic Fields of Uranus and Neptune: Metallic Fluid Hydrogen | The magnetic fields of the Ice Giant Planets Uranus and Neptune (U/N) are
unique in the solar system. Based on a substantial database measured on Earth
for representative planetary fluids at representative dynamic pressures up to
200 GPa (2 Mbar) and a few 1000 K, the complex magnetic fields of U/N are (i)
probably mad... | 1503.01042v2 |
2015-03-06 | NMR evidence for inhomogeneous glassy behavior driven by nematic fluctuations in iron arsenide superconductors | We present $^{75}$As nuclear magnetic resonance spin-lattice and spin-spin
relaxation rate data in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ and
Ba(Fe$_{1-x}$Cu$_x$)$_2$As$_2$ as a function of temperature, doping and
magnetic field. The relaxation curves exhibit a broad distribution of
relaxation rates, consistent with inhomogene... | 1503.01844v2 |
2015-03-09 | Buffer Aided Relaying Improves Both Throughput and End-to-End Delay | Buffer aided relaying has recently attracted a lot of attention due to the
improvement in the system throughput. However, a side effect usually deemed is
that buffering at relay nodes results in the increase in packet delays. In this
paper, we study the effect of buffering relays on the end-to-end delay of
users' data,... | 1503.02348v1 |
2015-03-09 | Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors | We investigate the influence of itinerant carriers on dynamics and
fluctuation of local moments in Fe-based superconductors, via linear spin-wave
analysis of a spin-fermion model containing both itinerant and local degrees of
freedom. Surprisingly against the common lore, instead of enhancing the
($\pi$,0) order, itine... | 1503.02653v1 |
2015-03-12 | Anomalous phonon redshift in K-doped BaFe2As2 iron pnictides | The effect of K, Co and P dopings on the lattice dynamics in the
BaFe$_2$As$_2$ system is studied by infrared spectroscopy. We focus on the
phonon at $\sim$ 253 cm$^{-1}$, the highest energy in-plane infrared-active
Fe-As mode in BaFe$_2$As$_2$. Our studies show that the Co and P dopings lead
to a blue shift of this ph... | 1503.03838v1 |
2015-03-13 | MMonCa: An Object Kinetic Monte Carlo simulator for damage irradiation evolution and defect diffusion | In this work we introduce the Object Kinetic Monte Carlo (OKMC) simulator
MMonCa and simulate the defect evolution in three different materials. We start
by explaining the theory of OKMC and showing some details of how such theory is
implemented by creating generic structures and algorithms in the objects that
we want ... | 1503.03987v1 |
2015-03-13 | Microscopic Parameters from High-Resolution Specific Heat Measurements on Overdoped BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ Single Crystals | We investigate the electronic specific heat of overdoped
BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ single crystals in the superconducting
state using high-resolution nanocalorimetry. From the measurements, we extract
the doping dependence of the condensation energy, superconducting gap $\Delta$,
and related microscopic param... | 1503.04088v1 |
2015-03-18 | Super-Hydrophobic Multi-Walled Carbon Nanotube Coatings for Stainless Steel | We have taken advantage of the native surface roughness and the iron content
of AISI 316 stainless steel to direct grow multi-walled carbon nanotube (MWCNT)
random networks by chemical vapor deposition (CVD) at low-temperature ($<
1000^{\circ}$C), without the addition of any external catalysts or
time-consuming pre-tre... | 1503.05482v1 |
2015-03-20 | Collapse of the magnetic moment under pressure of AFe$_2$ (A = Y, Zr, Lu and Hf) in the cubic Laves phase | The electronic structures of four Laves phase iron compounds (e.g. YFe$_2$,
ZrFe$_2$, LuFe$_2$ and HfFe$_2$) have been calculated by the state-of-the-art
full potential electronic structure code. The magnetic moments collapse under
hydrostatic pressure. This feature is found to be universal in these materials.
Its elec... | 1503.06017v1 |
2015-03-25 | Fractional Flux Plateau in Magnetization Curve of Multicomponent Superconductor Loop | Time-reversal symmetry (TRS) may be broken in superconductors with three or
more condensates interacting repulsively, yielding two degenerate states
specified by chirality of gap functions. We consider a loop of such
superconductor with two halves occupied by the two states with opposite
chiralities. Fractional flux pl... | 1503.07267v3 |
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