publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2015-03-26 | Quantitative analysis of magnetic spin and orbital moments from an oxidized iron (1 1 0) surface using electron magnetic circular dichroism | Understanding the ramifications of reduced crystalline symmetry on magnetic
behavior is a critical step in improving our understanding of nanoscale and
interfacial magnetism. However, investigations of such effects are often
controversial largely due to the challenges inherent in directly correlating
nanoscale stoichio... | 1503.07681v2 |
2015-03-28 | Nearly-critical spin and charge fluctuations in KFe2As2 observed by high-pressure NMR | We report a high-pressure 75As NMR study on the heavily hole-doped iron
pnictide superconductor KFe2As2 (Tc~3.8 K). The low-energy spin fluctuations
are found to decrease with applied pressure up to 2 GPa, but then increase
again, changing in lockstep with the pressure-induced evolution of Tc. Their
diverging nature su... | 1503.08298v1 |
2015-03-31 | Theory of excitations and dielectric response at a spin-orbital quantum critical point | Despite possessing a local spin $2$ moment on the iron site and a Curie-Weiss
temperature of $45K$, the A site spinel FeSc$_2$S$_4$ does not magnetically
order down to 50mK. Previous theoretical work by Chen and Balents advanced an
explanation for this observation in the form of the "$J_2$-$\lambda$" model
which places... | 1503.08887v2 |
2015-03-31 | Ultrafast near infrared photoinduced absorption in a multiferroic single crystal of bismuth ferrite | We studied the ultrafast third-order optical nonlinearity in a single crystal
of multiferroic bismuth ferrite (BiFeO3) in the near-infrared range of 0.5-1.0
eV, where the material is fundamentally transparent,at room temperature. With
pump pulses at 1.55 eV, which is off-resonant to the strong inter-band charge
transfe... | 1503.08976v1 |
2015-03-31 | BeppoSAX observations of GRO J1744-28 | We present an analysis of BeppoSAX observations of the unique transient
bursting X-ray pulsar GRO J1744-28. The observations took place in March 1997
during the decay phase of the outburst. We find that the persistent broadband
X-ray continuum of the source is consistent with a cutoff power law typical for
the accretin... | 1503.09020v1 |
2015-04-01 | Possible Field-Temperature Phase Diagrams of Two-Band Superconductors with Paramagnetic Pair-Breaking | Possible field-temperature superconducting (SC) phase diagrams in two-band
quasi-two-dimensional materials with a strong paramagnetic pair-breaking (PPB)
are considered theoretically. Attention is paid to the case under a magnetic
field $perpendicular$ to the SC layers and to essential differences from the
counterpart ... | 1504.00112v2 |
2015-04-06 | Quantifying the complex permittivity and permeability of magnetic nanoparticles | The complex permittivity and permeability of superparamagnetic iron-oxide
nanoparticles has been quantified using a circular waveguide assembly with a
static magnetic field to align the nanoparticle's magnetization. The high
sensitivity of the measurement provides the precise resonant feature of
nanoparticles. The comp... | 1504.01404v1 |
2015-04-09 | Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunneling microscopy | Single-layer FeSe film on SrTiO3(001) was recently found to be the champion
of interfacial superconducting systems, with a much enhanced superconductivity
than the bulk iron-based superconductors. Its superconducting mechanism is of
great interest. Although the film has a simple Fermi surface topology, its
pairing symm... | 1504.02185v1 |
2015-04-09 | Spectropolarimetrically accurate magnetohydrostatic sunspot model for forward modelling in helioseismology | We present a technique to construct a spectropolarimetrically accurate
magneto-hydrostatic model of a large-scale solar magnetic field concentration,
mimicking a sunspot. Using the constructed model we perform a simulation of
acoustic wave propagation, conversion and absorption in the solar interior and
photosphere wit... | 1504.02189v1 |
2015-04-09 | The origin of nematic order in FeSe | The origin of the 90 K nematic transition in the chalcogenide FeSe, which
displays no magnetic order down to T=0, remains a major puzzle for a unifying
theory for the iron-based superconductors. We analyze this problem in light of
recent experimental data which reveal very small Fermi pockets in this
material. We show ... | 1504.02315v1 |
2015-04-11 | Magnetic Nanorods Confined in a Lamellar Lyotropic Phase | The dilute lamellar phase of the nonionic surfactant C$_{12}$EO$_5$ was doped
with goethite (iron oxide) nanorods up to a fraction of 5 vol. %. The
interaction between the inclusions and the host phase was studied by polarized
optical microscopy (with or without an applied magnetic field) and by
small-angle X-ray scatt... | 1504.02879v1 |
2015-04-15 | Single Vortex Pinning and Penetration Depth in Superconducting NdFeAsO$_{1-x}$F$_x$ | We use a magnetic force microscope (MFM) to investigate single vortex pinning
and penetration depth in NdFeAsO$_{1-x}$F$_x$, one of the highest-$T_c$
iron-based superconductors. In fields up to 20 Gauss, we observe a disordered
vortex arrangement, implying that the pinning forces are stronger than the
vortex-vortex int... | 1504.04045v1 |
2015-04-16 | Origin of the Higher-$T_\rm{c}$ Phase in the K$_x$Fe$_{2-y}$Se$_2$ System | Single crystals of K$_x$Fe$_{2-y}$Se$_2$ are prepared by quenching at various
temperatures. The crystals obtained at higher quenching temperatures have a
surface morphology with mesh-like texture. They show a sharp superconducting
transition at $T_\rm{c}$ ~32 K with a large shielding volume fraction. On the
other hand,... | 1504.04197v2 |
2015-04-17 | Structural analysis of superconducting dipole prototype for HIAF | The High Intensity Heavy-Ion Accelerator Facility is a new project in the
Institute of Modern Physics. The dipole magnets of all rings are conceived as
fast cycled superconducting magnet with high magnetic field and large gap, the
warm iron and superconducting coil structure (superferric) is adopted. The
reasonable str... | 1504.04468v1 |
2015-04-21 | Fast Luminous Blue Transients from Newborn Black Holes | Newborn black holes in collapsing massive stars can be accompanied by a
fallback disk. The accretion rate is typically super-Eddington and strong disk
outflows are expected. Such outflows could be directly observed in some failed
explosions of compact (blue supergiants or Wolf-Rayet stars) progenitors, and
may be more ... | 1504.05582v1 |
2015-04-26 | Amplitude modes and dynamic coexistence of competing orders in multicomponent superconductors | We study the nonequilibrium dynamics of an electronic model with competing
spin-density-wave and unconventional superconductivity in the context of iron
pnictides. Focusing on the collisionless regime, we find that magnetic and
superconducting order parameters may coexist dynamically after a sudden quench,
even though ... | 1504.06874v2 |
2015-04-28 | Single Photon Level Study of Microwave Properties of Lithium Niobate at milli-Kelvin Temperatures | Properties of doped and natural impurities in Lithium Niobate single crystals
are studied using the Whispering Gallery Mode method at low temperatures as a
function of magnetic field. The study reveals considerable coupling of
microwave photon modes to the Fe$^{3+}$ spin ensemble in iron-doped and
non-doped crystals. T... | 1504.07352v1 |
2015-04-28 | Phase diagram of the isovalent phosphorous-substituted 122-type iron pnictides | Recent experiments demonstrated that isovalent doping system gives the
similar phase diagram as the heterovalent doped cases. For example, with the
phosphorous (P)-doping, the magnetic order in
BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ compound is first suppressed, then the
superconductivity dome emerges to an extended dopin... | 1504.07539v1 |
2015-04-30 | Ab initio calculation of Spin-Polarized Low-Energy Electron Diffraction Pattern for the systems Fe(001) and Fe(001)-p(1x1)-O | The construction of a multi-channel vector spin polarimeter requires the
development of a new detector type, which works as a spin polarizing mirror
with high reflectivity and asymmetry properties to guarantee for a high figure
of merit. Technical realizations are found by spin polarized electron
scattering from a surf... | 1504.08198v2 |
2015-04-30 | TITUS: An Intermediate Distance Detector for the Hyper-Kamiokande Neutrino Beam | The Tokai Intermediate Tank with Unoscillated Spectrum (TITUS) detector is a
proposed addition to the Hyper-Kamiokande (HK) experiment located approximately
2 km from the J-PARC neutrino beam. The design consists of a 2 kton Gadolinium
(Gd) doped water Cherenkov detector, surrounded by a magnetized iron detector
design... | 1504.08272v2 |
2015-05-05 | Formation depths of Fraunhofer lines | We have summed up our investigations performed in 1970--1993. The main task
of this paper is clearly to show processes of formation of spectral lines as
well as their distinction by validity and by location. For 503 photospheric
lines of various chemical elements in the wavelength range 300--1000 nm we list
in Table th... | 1505.00975v1 |
2015-05-06 | Tetragonal magnetic phase in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ from x-ray and neutron diffraction | Combined neutron and x-ray diffraction experiments demonstrate the formation
of a low-temperature minority tetragonal phase in
Ba$_{0.76}$K$_{0.24}$Fe$_2$As$_2$ in addition to the majority magnetic,
orthorhombic phase. A coincident enhancement in the magnetic ($\frac{1}{2}$
$\frac{1}{2}$ 1) peaks shows that this minori... | 1505.01433v1 |
2015-05-11 | Two-dimensional Cs-vacancy superstructure in iron-based superconductor $Cs_{0.8}Fe_{1.6}Se_2$ | Single crystal neutron diffraction is combined with synchrotron x-ray
scattering to identify the different superlattice phases present in
$Cs_{0.8}Fe_{1.6}Se_2$. A combination of single crystal refinements and first
principles modelling are used to provide structural solutions for the
$\sqrt{5}\times\sqrt{5}$ and $\sqr... | 1505.02527v1 |
2015-05-11 | Interplay of structure, magnetism, and superconductivity in Se substituted iron telluride with excess Fe | We investigated the evolution of the temperature-composition phase diagram of
Fe$_{1+y}$Te upon Se substitution. In particular, the effect of Se substitution
on the two-step, coupled magneto-structural transition in Fe$_{1+y}$Te single
crystals is investigated. To this end, the nominal Fe excess was kept at $y$ =
0.12.... | 1505.02542v1 |
2015-05-14 | Nucleosynthesis in a Primordial Supernova: Carbon and Oxygen Abundances in SMSS J031300.36-670839.31 | SMSS J031300.36-670839.3 (hereafter SM0313-6708) is a sub-giant halo star,
with no detectable Fe lines and large overabundances of C and Mg relative to
Ca. We obtained VLT-UVES spectra extending to 3060 Angstroms showing strong OH
A-X band lines enabling an oxygen abundance to be derived. The OH A-X band
lines in SM031... | 1505.03756v2 |
2015-05-16 | Glide reflection symmetry, Brillouin zone folding and superconducting pairing for the $P4/nmm$ space group | Motivated by the studies of the superconducting pairing states in the
iron-based superconductors, we analyze the effects of Brillouin zone folding
procedure from a space group symmetry perspective for a general class of
materials with the $P4/nmm$ space group. The Brillouin zone folding amounts to
working with an effec... | 1505.04227v2 |
2015-05-17 | Palladium and silver abundances in stars with [Fe/H] > -2.6 | Palladium (Pd) and silver (Ag) are the key elements for probing the weak
component in the rapid neutron-capture process (r-process) of stellar
nucleosynthesis. We performed a detailed analysis of the high-resolution and
high signal-to-noise ratio near-UV spectra from the archive of HIRES on the
Keck telescope, UVES on ... | 1505.04356v1 |
2015-05-19 | Electronic nematic susceptibility of iron-based superconductors | We review our recent experimental results on the electronic nematic phase in
electron- and hole-doped BaFe$_2$As$_2$ and FeSe. The nematic susceptibility is
extracted from shear-modulus data (obtained using a three-point-bending method
in a capacitance dilatometer) using Landau theory and is compared to the
nematic sus... | 1505.05120v1 |
2015-05-22 | Probing Atomic Structure and Majorana Wavefunctions in Mono-Atomic Fe-chains on Superconducting Pb-Surface | Motivated by the striking promise of quantum computation, Majorana bound
states (MBSs) in solid-state systems have attracted wide attention in recent
years. In particular, the wavefunction localization of MBSs is a key feature
and crucial for their future implementation as qubits. Here, we investigate the
spatial and e... | 1505.06078v2 |
2015-05-22 | Indications of Negative Evolution for the Sources of the Highest Energy Cosmic Rays | Using recent measurements of the spectrum and chemical composition of the
highest energy cosmic rays, we consider the sources of these particles. We find
that the data strongly prefers models in which the sources of the ultra-high
energy cosmic rays inject predominantly intermediate mass nuclei, with
comparatively few ... | 1505.06090v2 |
2015-05-25 | Bandwidth and Electron Correlation-Tuned Superconductivity in Rb$_{0.8}$Fe$_{2}$(Se$_{1-z}$S$_z$)$_2$ | We present a systematic angle-resolved photoemission spectroscopy study of
the substitution-dependence of the electronic structure of
Rb$_{0.8}$Fe$_{2}$(Se$_{1-z}$S$_z$)$_2$ (z = 0, 0.5, 1), where
superconductivity is continuously suppressed into a metallic phase. Going from
the non-superconducting Rb$_{0.8}$Fe$_{2}$(S... | 1505.06636v2 |
2015-05-25 | Magnetic Ground State of an Individual Fe2+ Ion in Strained Semiconductor Nanostructure | We investigate spin properties of a Fe2+ dopant, known for having single
nondegenerate ground state in bulk host semiconductor. Due to zero magnetic
moment such a ground state is of little use for spintronics and solotronics. We
show that this well-established picture of Fe2+ spin configuration can be
contradicted by s... | 1505.06763v1 |
2015-05-27 | Energy and Direction Estimation of Neutrinos in muonless events at ICAL | In this paper, we study events without identifiable muon tracks in the Iron
Calorimeter detector at the India-based Neutrino Observatory. Such events are
dominated by high energy (E$_\nu>$1 GeV) $\nu_e$ charged current interactions,
which have been studied only in a few experiments so far. The charged
particles, produc... | 1505.07295v1 |
2015-05-28 | Properties of AGN coronae in the NuSTAR era | The focussing optics of NuSTAR have enabled high signal-to-noise spectra to
be obtained from many X-ray bright Active Galactic Nuclei (AGN) and Galactic
Black Hole Binaries (BHB). Spectral modelling then allows robust
characterization of the spectral index and upper energy cutoff of the coronal
power-law continuum, aft... | 1505.07603v1 |
2015-05-28 | Se content $x$ dependence of electron correlation strength in Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ | The iron chalcogenide Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ on the Te-rich side is
known to exhibit the strongest electron correlations among the Fe-based
superconductors, and is non-superconducting for $x$ < 0.1. In order to
understand the origin of such behaviors, we have performed ARPES studies of
Fe$_{1+y}$Te$_{1-x}$Se$_{x}... | 1505.07637v1 |
2015-05-30 | Large increase of the anisotropy factor in the overdoped region of Ba(Fe$_{1-x}$Ni$_x$)$_2$As$_2$ as probed by fluctuation spectroscopy | We study the diamagnetism induced by thermal fluctuations above the
superconducting transition of the iron pnictide Ba(Fe$_{1-x}$Ni$_x$)$_2$As$_2$
with different doping levels. The measurements are performed with magnetic
fields up to 7 T applied in the two main crystal directions. These data provide
double information... | 1506.00170v1 |
2015-06-04 | Exploring the feasibility of Fe(Se,Te) conductors by ex-situ Powder-in-Tube method | In this work, the feasibility condition of Powder-In-Tube (PIT) processed
wires of Fe(Se,Te) superconductor has been investigated. We faced several
technical issues that are extensively described and discussed. In particular,
we tested different metals and alloys as external sheaths (Cu, Ag, Nb, Ta, Ni,
Fe, cupronickel... | 1506.01630v1 |
2015-06-09 | Optical observations of a SN 2002cx-like peculiar supernova SN 2013en in UGC 11369 | We present optical observations of a SN 2002cx-like supernova SN 2013en in
UGC 11369, spanning from a phase near maximum light (t= +1 d) to t= +60 d with
respect to the R-band maximum. Adopting a distance modulus of mu=34.11 +/- 0.15
mag and a total extinction (host galaxy+Milky Way) of $A_V \sim1.5$ mag, we
found that... | 1506.02845v1 |
2015-06-09 | Synthesis, Crystal Structure and Magnetism of Eu3Sc2O5Fe2As2 | The iron arsenide Eu3Fe2O5Fe2As2 was synthesized at 1173-1373 K in a
resistance furnace and characterized by X-ray powder diffraction with Rietveld
analysis: Sr3Fe2O5Cu2S2-type, I4/mmm, a = 406.40(1) pm, c = 2646.9(1) pm.
Layers of edge-sharing FeAs4/4 tetrahedra are separated by perovskite-like
oxide blocks. No struct... | 1506.02925v1 |
2015-06-10 | Interaction of discrete breathers with primary lattice defects in bcc Fe | The interaction of discrete breathers with the primary lattice defects in
transition metals such as vacancy, dislocation, and surface is analyzed on the
example of bcc iron employing atomistic simulations. Scattering of discrete
breathers on the lattice defects induces localized atomic excitations, with
intensity and r... | 1506.03507v1 |
2015-06-12 | Near-field microwave imaging of inhomogeneous K$_x$Fe$_y$Se$_2$: separation of topographic and electric features | It is important for modern scanning microwave microscopes to overcome the
effect of the surface roughness. Here, we report microwave conductivity imaging
of the phase-separated iron chalcogenide K$_x$Fe$_y$Se$_2$ ($x=0.8$,
$y=1.6$-$2$), in which electric conductivity-induced contrast is distinguished
from topography-in... | 1506.03911v1 |
2015-06-17 | Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03As single crystals under hydrostatic pressure | Tremendous efforts towards improvement in the critical current density (Jc)
of iron based superconductors (FeSCs), especially at relatively low
temperatures and magnetic fields, have been made so far through different
methods, resulting in real progress. Jc at high temperatures in high fields
still needs to be further ... | 1506.05183v1 |
2015-06-17 | Local spin-density-wave order inside vortex cores in multiband superconductors | Coexistence of antiferromagnetic order with superconductivity in many
families of newly discovered iron-based superconductors has renewed interest to
this old problem. Due to competition between the two types of order, one can
expect appearance of the antiferromagnetism inside the cores of the vortices
generated by the... | 1506.05440v2 |
2015-06-26 | Correlated electron behavior of metalorganic molecules: insights from density functional theory combined with many-body effects using exact diagonalization | A proper theoretical description of electronic structure of the 3d orbitals
in the metal centers of functional metalorganics is a challenging problem. In
this letter, we apply density functional theory and an exact diagonalization
method in a many body approach to study the ground state electronic
configuration of an i... | 1506.07973v1 |
2015-06-29 | Neutrino-driven explosions of ultra-stripped type Ic supernovae generating binary neutron stars | We study explosion characteristics of ultra-stripped supernovae (SNe), which
are candidates of SNe generating binary neutron stars (NSs). As a first step,
we perform stellar evolutionary simulations of bare carbon-oxygen cores of mass
from 1.45 to 2.0 $M_\odot$ until the iron cores become unstable and start
collapsing.... | 1506.08827v2 |
2015-07-01 | Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb doped SrTiO3 substrate | We report the Meissner effect studies on an FeSe thin film grown on Nb doped
SrTiO3 substrate by molecular beam epitaxy. Two-coil mutual inductance
measurement clearly demonstrates the onset of diamagnetic screening at 65 K,
which is consistent with the gap opening temperature determined by previous
angle resolved phot... | 1507.00129v2 |
2015-07-06 | Isotope shifts and hyperfine structure of the laser cooling Fe I 358-nm line | We report on the measurement of the isotope shifts of the $3d^74s \,\, a \,
{}^5\!F_5 - 3d^74p \,\, z \, {}^5\!G^o_6$ Fe~I line at 358~nm between all four
stable isotopes ${}^{54}$Fe, ${}^{56}$Fe, ${}^{57}$Fe and ${}^{58}$Fe, as well
as the hyperfine structure of that line for ${}^{57}$Fe, the only stable
isotope havin... | 1507.01498v1 |
2015-07-07 | New Superconductivity Dome in LaFeAsO$_{1-x}$F$_{x}$ Accompanied by Structural Transition | High temperature superconductivity is often found in the vicinity of
antiferromagnetism. This is also true in LaFeAsO$_{1-x}$F$_{x}$ ($x \leq$ 0.2)
and many other iron-based superconductors, which leads to proposals that
superconductivity is mediated by fluctuations associated with the nearby
magnetism. Here we report ... | 1507.01750v2 |
2015-07-08 | Towards quantifying the role of exact exchange in predictions of transition metal complex properties | We estimate the prediction sensitivity with respect to Hartree-Fock exchange
in approximate density functionals for representative Fe(II) and Fe(III)
octahedral complexes. Based on the observation that the range of parameters
spanned by the most widely-employed functionals is relatively narrow, we
compute electronic st... | 1507.02261v1 |
2015-07-11 | End states and subgap structure in proximity-coupled chains of magnetic adatoms | A recent experiment [Nadj-Perge et al., Science 346, 602 (2014)] provides
evidence for Majorana zero modes in iron (Fe) chains on the superconducting
Pb(110) surface. Here, we study this system by scanning tunneling microscopy
using superconducting tips. This high-resolution technique resolves a rich
subgap structure, ... | 1507.03104v2 |
2015-07-13 | Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ Single Crystal films | Localized high frequency (several GHz) electrodynamic properties of a high
quality epitaxial, single-crystal Iron-Pnicitde Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$
thin film near optimal doping (x=0.08) are measured under a localized and
strong RF magnetic field, created by a near-field microwave microscope. Two
reflection elect... | 1507.03318v1 |
2015-07-14 | Observational consequences of turbulent pressure in the envelopes of massive stars | The major mass fraction of the envelope of hot luminous stars is radiatively
stable. However, the partial ionisation of hydrogen, helium and iron gives rise
to extended sub-surface convection zones in all of them. In this work, we
investigate the effect of the pressure induced by the turbulent motion in these
zones bas... | 1507.03988v1 |
2015-07-15 | Neutron investigation of the magnetic scattering in an iron-based ferromagnetic superconductor | Neutron diffraction and small angle scattering experiments have been carried
out on the double-isotopic polycrystalline sample (7Li0.82Fe0.18OD)FeSe.
Profile refinements of the diffraction data establish the composition and
reveal an essentially single phase material with lattice parameters of a=
3.7827 {\AA} and c= 9.... | 1507.04311v1 |
2015-07-16 | Strong quantum effects in an almost classical antiferromagnet on a kagome lattice | Two ubiquitous features of frustrated spin systems stand out: massive
degeneracy of their ground states and flat, or dispersionless, excitation
branches. In real materials, the former is frequently lifted by secondary
interactions or quantum fluctuations, in favor of an ordered or spin-liquid
state, but the latter ofte... | 1507.04738v2 |
2015-07-21 | Edge states and local electronic structure around an adsorbed impurity in a topological superconductor | Recently topological superconducting states has attracted a lot of interest.
In this work, we consider a topo- logical superconductor with $Z_2$ topological
mirror order [1] and s$\pm$-wave superconducting pairing symmetry, within a
two-orbital model originally designed for iron-based superconductivity [2]. We
predict ... | 1507.05904v1 |
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