publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2016-10-27 | Influence of multiorbitals and anisotropic Coulomb interactions on isotope effect coefficient in doped Fe-based superconductors | The present work describes the theoretical analysis of isotope effect
coefficient as a function of transition temperature in two orbital per site
model Hamiltonian in iron based superconducting system. The expression of
isotope effect coefficient has been computed numerically and self-consistently
by employing Green's ... | 1610.08888v1 |
2016-11-01 | Missing Fe: hydrogenated iron nanoparticles | Although it was found that the FeH lines exist in the spectra of some stars,
none of the spectral features in the ISM have been assigned to this molecule.
We suggest that iron atoms interact with hydrogen and produce Fe-H
nanoparticles which sometimes contain many H atoms. We calculate infrared
spectra of hydrogenated ... | 1611.00309v1 |
2016-11-25 | Modeling the Anomalous Microwave Emission with Spinning Nanoparticles: No PAHs Required | In light of recent observational results indicating an apparent lack of
correlation between the Anomalous Microwave Emission (AME) and mid-infrared
emission from polycyclic aromatic hydrocarbons (PAHs), we assess whether
rotational emission from spinning silicate and/or iron nanoparticles could
account for the observed... | 1611.08597v1 |
2017-01-18 | Phase-separation control of K$_x$Fe$_{2-y}$Se$_2$ superconductor through rapid-quenching process | K$_x$Fe$_{2-y}$Se$_2$ exhibits an iron-vacancy ordering at $T_{\rm s}
{\sim}270{\deg}$C and separates into two phases: a minor superconducting
(iron-vacancy-disordered) phase and a major non-superconducting
(iron-vacancy-ordered) phase. The microstructural and superconducting
properties of this intermixture can be tune... | 1701.04911v2 |
2017-05-19 | The phonon softening due to melting of the ferromagnetic order in elemental iron | We study the fundamental question of the lattice dynamics of a metallic
ferromagnet in the regime where the static long range magnetic order is
replaced by the fluctuating local moments embedded in a metallic host. We use
the \textit{ab initio} Density Functional Theory(DFT)+embedded Dynamical
Mean-Field Theory(eDMFT) ... | 1705.06877v2 |
2017-06-21 | Emergent phases in iron pnictides: Double-Q antiferromagnetism, charge order and enhanced nematic correlations | Electron correlations produce a rich phase diagram in the iron pnictides.
Earlier theoretical studies on the correlation effect demonstrated how quantum
fluctuations weaken and concurrently suppress a $C_2$-symmetric single-Q
antiferromagnetic order and a nematic order. Here we examine the emergent
phases near the quan... | 1706.07087v2 |
2017-09-26 | Timing and Charge measurement of single gap Resistive Plate Chamber Detectors for INO-ICAL Experiment | The recently approved India-based Neutrino Observatory will use the world's
largest magnet to study atmospheric muon neutrinos. The 50 kiloton Iron
Calorimeter consists of iron alternating with single-gap resistive plate
chambers. A uniform magnetic field of $\sim$1.5 T is produced in the iron using
toroidal-shaped cop... | 1709.08946v1 |
2018-01-03 | Distinguishing black holes and naked singularities with iron line spectroscopy | It is commonly thought that the final product of gravitational collapse is a
black hole. Nevertheless, theoretical studies have not yet provided a final
answer to the question whether black holes are the only possible outcome or
whether naked singularities are also allowed. Observational tests may thus
represent a comp... | 1801.00867v2 |
2018-01-24 | Evidence for a neutral iron line generated by MeV protons from supernova remnants interacting with molecular clouds | Supernova remnants (SNRs) have been prime candidates for Galactic cosmic-ray
accelerators. When low-energy cosmic-ray protons (LECRp) collide with
interstellar gas, they ionize neutral iron atoms and emit the neutral iron line
(Fe I K$\alpha$) at 6.40keV. We search for the iron K-shell line in seven SNRs
from the Suzak... | 1801.07881v1 |
2018-02-11 | Two-dimensional Iron Monocarbide with Planar Hypercoordinate Iron and Carbon | We report on the theoretical discovery of Iron monocarbide binary sheets
stabilized at two-dimensional confined space, which we call tetragonal-FeC
(t-FeC) and orthorhombic-FeC (o-FeC), respectively. From the energy viewpoint,
the proposed t-FeC is the global minimum configuration in the 2D space, and
each carbon atom ... | 1802.03673v1 |
2018-03-01 | Strong electronic correlations and Fermi surface reconstruction in the quasi-one dimensional iron superconductor BaFe2S3 | BaFe2S3 is a special iron superconductor with two-leg ladder structure which
can help to unravel the role played by the electronic correlations in high-Tc
superconductivity. At zero pressure it is insulating with stripe
antiferromagnetic (AF) order and superconductivity emerges under pressure. We
use a slave-spin techn... | 1803.00282v1 |
2018-03-28 | Iron line spectroscopy with Einstein-dilaton-Gauss-Bonnet black holes | Einstein-dilaton-Gauss-Bonnet gravity is a well-motivated alternative theory
of gravity that emerges naturally from string theory. While black hole
solutions have been known in this theory in numerical form for a while, an
approximate analytical metric was obtained recently by some of us, which allows
for faster and mo... | 1803.10819v1 |
2018-04-13 | Subsurface Cation Vacancy Stabilization of the Magnetite (001) Surface | Iron oxides play an increasingly prominent role in heterogeneous catalysis,
hydrogen production, spintronics and drug delivery. The surface or material
interface can be performance limiting in these applications, so it is vital to
determine accurate atomic-scale structures for iron oxides and understand why
they form. ... | 1804.04836v1 |
2018-04-21 | Iron line spectroscopy of black holes in asymptotically safe gravity | We study the iron line shape expected in the reflection spectrum of accretion
disks around black holes in asymptotically safe gravity. We compare the results
of our simulations with the iron line shapes expected in the reflection
spectrum of accretion disks around Kerr black holes to see if the technique of
iron line s... | 1804.07955v2 |
2018-04-30 | New iron-based multiferroics with improper ferroelectricity | In this contribution to the special issue on magnetoelectrics and their
applications, we focus on some single phase multiferroics theoretically
predicted and/or experimentally discovered by the authors in recent years. In
these materials, iron is the common core element. However, these materials are
conceptually differ... | 1804.11125v1 |
2018-05-23 | Single-crystal growth of iron-based superconductor La$_{0.34}$Na$_{0.66}$Fe$_2$As$_2$ | We report single-crystal growth of La$_{0.34}$Na$_{0.66}$Fe$_2$As$_2$
iron-based superconductor with the size of several millimeters. The samples
were accidentally obtained in trying to grow LaFeAsO$_{1-y}$F$_y$ ( $y \geq$
0.8 ) single crystals with NaAs and NaF flux. The sample shows both
antiferromagnetic and structu... | 1805.08923v2 |
2018-06-16 | Iron Line Spectroscopy of Black Holes in Vector-Tensor Galileons Modified Gravity | Recently, a rotating black hole solution was found in Vector-Tensor Galileons
modified gravity that has some significant differences from the Kerr black hole
solution. We study the iron line shape that is part of the reflection spectrum
of accretion disks around black holes in this new black hole solution. We
simulate ... | 1806.06240v2 |
2018-08-07 | Forming Mercury by Giant Impacts | The origin of Mercury's high iron-to-rock ratio is still unknown. In this
work we investigate Mercury's formation via giant impacts and consider the
possibilities of a single giant impact, a hit-and-run, and multiple collisions
in one theoretical framework. We study the standard collision parameters
(impact velocity, m... | 1808.02448v1 |
2018-08-26 | Realization of continuously electron doping in bulk iron selenides and identification of a new superconducting zone | It is known that iron selenide superconductors exhibit unique characteristics
distinct from iron pnicitides, especially in the electron-doped region.
However, acomprehensive study of continuous carrier doping ang the
corresponding crystal structures of FeSe is still lacking, mainly due to the
difficulties in controllin... | 1808.08501v1 |
2018-09-13 | Dendritic Oxide Growth in Zero-Valent Iron Nanofilms Revealed by Atom Probe Tomography | Atom probe tomography (APT) analysis of chemically pure nanofilms of
zero-valent iron (Fe(0), or ZVI) and their thermal oxide nano-overlayers
reveals the presence of dendritic iron oxide features that extend from the
oxide nano-overlayer surface into the ZVI bulk. The dendrites are observed by
APT to be in the 5 nm x 1... | 1809.04909v2 |
2018-10-28 | A mathematical and experimental study on iron rings formation in porous stones | In this interdisciplinary paper, we study the formation of iron precipitates
- the so-called Liesegang rings - in Lecce stones in contact with iron source.
These phenomena are responsible of exterior damages of lapideous artifacts, but
also in the weakening of their structure. They originate in presence of water,
deter... | 1810.11825v1 |
2019-01-10 | A topology optimized switchable permanent magnet system | The design of a magnetic field source that can switch from a high field to a
low field configuration by rotation by $90^\circ$ of a set of iron pieces is
investigated using topology optimization. A Halbach cylinder is considered as
the magnetic field source and iron inserts are placed in the air gap of the
Halbach cyli... | 1901.03110v1 |
2019-01-10 | Topological Vortex Phase Transitions in Iron-Based Superconductors | We study topological vortex phases in iron-based superconductors. Besides the
previously known vortex end Majorana zero modes (MZMs) phase stemming from the
existence of a three dimensional (3D) strong topological insulator state, we
show that there is another topologically nontrivial phase as iron-based
superconductor... | 1901.03120v1 |
2019-01-28 | Surface passivation by graphene in the lubrication of iron: A comparison with bronze | It has been recently reported that graphene is able to significantly reduce
the friction coefficient of steel-on-steel sliding contacts. The microscopic
origin of this behavior has been attributed to the mechanical action of load
carrying capacity. However, a recent work highlighted the importance of the
chemical actio... | 1901.09616v1 |
2019-03-19 | First performance test of 30 mm iron-based superconductor single pancake coil under 24 T background field | The iron-based superconductor (IBS) single pancake coil (SPC) with 30 mm
inner diameter was firstly fabricated and tested under 24 T background field.
This SPC was successfully made using the 7-filamentary Ba1-xKxFe2As2 (Ba122)
tape by wind-and-react method. This IBS coil show the highest Ic value at
magnetic field rep... | 1903.07960v1 |
2019-03-29 | Nematic and Antiferromagnetic Quantum Criticality in a Multi-Orbital Hubbard Model for Iron Pnictides | The extent to which quantum criticality drives the physics of iron pnictides
is a central question in the field. Earlier theoretical considerations were
based on an effective field theory, and the proposed realization in P-doped
iron arsenides has received extensive experimental evidence. To connect the
quantum critica... | 1903.12625v1 |
2019-04-08 | High-energy spin fluctuation in low-$T_{\rm c}$ iron-based superconductor LaFePO$_{0.9}$ | Spin fluctuations are widely believed to play an important role in the
superconducting mechanisms of unconventional high-temperature superconductors.
Spin fluctuations have been observed in iron-based superconductors as well.
However, in some iron-based superconductors such as LaFePO$_{0.9}$, they have
not been observe... | 1904.03854v1 |
2019-06-04 | Pairing symmetry and topological surface state in iron-chalcogenide superconductors | The symmetries of superconducting gap functions remain an important question
of iron-based superconductivity. Motivated by the recent angle-resolved
photoemission spectroscopic measurements on iron-chalcogenide superconductors,
we investigate the influence of pairing symmetries on the topological surface
state. If the ... | 1906.01754v3 |
2019-06-20 | Effects of spin-orbit coupling on the neutron spin resonance in iron-based superconductors | The so-called neutron spin resonance consists of a prominent enhancement of
the magnetic response at a particular energy and momentum transfer upon
entering the superconducting state of unconventional superconductors. In the
case of iron-based superconductors, the neutron resonance has been extensively
studied experime... | 1906.08566v1 |
2019-08-26 | New thermodynamic constraints on internal, thermal and magnetic states of terrestrial-like Super-Earths | Ascertaining rocky exoplanets dynamic evolution requires better understanding
of key internal thermophysical processes that shaped their geological surfaces,
heat fluxes, volatiles and atmospheric content. New high-pressure experiments
on iron and silicates compressible, melting and transport properties are
providing n... | 1908.09871v1 |
2019-11-03 | Interpreting Verbal Irony: Linguistic Strategies and the Connection to the Type of Semantic Incongruity | Human communication often involves the use of verbal irony or sarcasm, where
the speakers usually mean the opposite of what they say. To better understand
how verbal irony is expressed by the speaker and interpreted by the hearer we
conduct a crowdsourcing task: given an utterance expressing verbal irony, users
are ask... | 1911.00891v3 |
2020-03-27 | Phonon dispersions throughout the iron spin crossover in ferropericlase | Ferropericlase (Fp), (Mg$_\mathrm{1-x}$Fe$_\mathrm{x}$)O, is the second most
abundant phase in the Earths lower mantle. At relevant pressure-temperature
conditions, iron in Fp undergoes a high spin (HS), S=2, to low spin (LS), S=0,
state change. The nature of this phenomenon is quite well understood now, but
there are ... | 2003.12348v1 |
2020-06-11 | Embracing defects and disorder in magnetic nanoparticles | Iron oxide nanoparticles have tremendous scientific and technological
potential in a broad range of technologies, from energy applications to
biomedicine. To improve their performance, single-crystalline and defect-free
nanoparticles have thus far been aspired. However, in several recent studies
defect-rich nanoparticl... | 2006.06474v1 |
2020-11-20 | An Investigation of Commercial Iron Oxide Nanoparticles: Advanced Structural and Magnetic Properties Characterization | Magnetic nanoparticles (MNPs) have been extensively used as tiny heating
sources in magnetic hyperthermia therapy, contrast agents in magnetic resonance
imaging (MRI), tracers in magnetic particle imaging (MPI), carriers for
drug/gene delivery, etc. There have emerged many magnetic
nanoparticle/microbeads suppliers sin... | 2011.10215v1 |
2020-11-23 | A Learning-based Optimization Algorithm:Image Registration Optimizer Network | Remote sensing image registration is valuable for image-based navigation
system despite posing many challenges. As the search space of registration is
usually non-convex, the optimization algorithm, which aims to search the best
transformation parameters, is a challenging step. Conventional optimization
algorithms can ... | 2011.11365v1 |
2021-02-01 | Confirmation of Asymmetric Iron Absorption in WASP-76b with HARPS | Hot Jupiters are predicted to have hot, clear daysides and cooler, cloudy
nightsides. Recently, an asymmetric signature of iron absorption has been
resolved in the transmission spectrum of WASP-76b using ESPRESSO on ESO's Very
large Telescope. This feature is interpreted as being due to condensation of
iron on the nigh... | 2102.01095v1 |
2021-03-07 | IRON: Invariant-based Highly Robust Point Cloud Registration | In this paper, we present IRON (Invariant-based global Robust estimation and
OptimizatioN), a non-minimal and highly robust solution for point cloud
registration with a great number of outliers among the correspondences. To
realize this, we decouple the registration problem into the estimation of
scale, rotation and tr... | 2103.04357v2 |
2021-03-11 | Flatband-Induced Itinerant Ferromagnetism in RbCo$_2$Se$_2$ | $A$Co$_2$Se$_2$ ($A$=K,Rb,Cs) is a homologue of the iron-based
superconductor, $A$Fe$_2$Se$_2$. From a comprehensive study of RbCo$_2$Se$_2$
via measurements of magnetization, transport, neutron diffraction,
angle-resolved photoemission spectroscopy, and first-principle calculations, we
identify a ferromagnetic order a... | 2103.06528v1 |
2021-04-20 | Bulk superconductivity in FeTe$_{1-x}$Se$_{x}$ via physicochemical pumping of excess iron | The iron-based superconductor FeTe$_{1-x}$Se$_{x}$ has attracted considerable
attention as a candidate topological superconductor owing to a unique
combination of topological surface states and bulk high-temperature
superconductivity. The superconducting properties of as-grown single crystals,
however, are highly varia... | 2104.10145v1 |
2021-05-26 | Prenatal stress perturbs fetal iron homeostasis in a sex-specific manner | What is the influence of chronic maternal prenatal stress (PS) on fetal iron
homeostasis? In a prospective case-control study in 164 pregnant women, we show
that cord blood transferrin saturation is lower in male stressed neonates. The
total effect of PS exposure on fetal ferritin revealed a decrease of 15.4%
compared ... | 2105.12809v3 |
2021-06-02 | Effective exchange interaction for terahertz spin waves in iron layers | The exchange stiffness is a central material parameter of all ferromagnetic
materials. Its value controls the Curie temperature as well as the dynamic
properties of spin waves to a large extend. Using ultrashort spin current
pulses we excite perpendicular standing spin waves (PSSW) in ultrathin
epitaxial iron layers at... | 2106.01066v1 |
2021-06-08 | Topological Superconductivity in an s-wave Superconductor and Its Implication to Iron-based Superconductors | In the presence of both space and time reversal symmetries, an s-wave A1g
superconducting state is usually topologically trivial. Here we demonstrate
that an exception can take place in a type of nonsymmorphic lattice structures.
We specify the demonstration in a system with a centrosymmetric space group
P4/nmm, the sy... | 2106.04200v1 |
2021-08-10 | Metallic nature and site-selective magnetic collapse in iron oxide Fe4O5 at the extreme conditions of Earth's deep interior | Properties of iron oxides at the extreme conditions are of essential
importance in condensed matter physics and Geophysics. The recent discovery of
a new type of iron oxide, Fe4O5, at high pressure and high temperature of
Earth's deep interior attracts great interests. In this paper, we report the
electronic structure ... | 2108.04477v1 |
2021-11-30 | Early differentiation of magmatic iron meteorite parent bodies from Mn-Cr chronometry | Magmatic iron meteorite groups such as IIAB, IIIAB and IVA, represent the
largest sampling of extraterrestrial core material from the earliest accreted
distinct planetary bodies in the solar system. Chromium isotope compositions of
chromite/daubreelite from seven samples, translated into 53Cr/52Cr model ages,
provide r... | 2111.15291v1 |
2022-08-18 | Role of strain on the stability of B, C, N, and O in Iron | The preference for the occupation of solute atoms like B, C, N, and O at
various sites in iron is generally explained by the size of the solute and the
volume available for the solute atoms to occupy. Such an explanation based on
the size of solute atoms and available space at the occupation site assumes
that distortio... | 2208.08680v1 |
2022-11-09 | Quantitative Susceptibility Mapping in Cognitive Decline: A Review of Technical Aspects and Applications | In the human brain, essential iron molecules for proper neurological
functioning exist in transferrin (tf) and ferritin (Fe3) forms. However, its
unusual increment manifests iron overload, which reacts with hydrogen peroxide.
This reaction will generate hydroxyl radicals, and irons higher oxidation
states. Further, thi... | 2211.04764v1 |
2022-11-15 | The Dissipation of the Solar Nebula Constrained by Impacts and Core Cooling in Planetesimals | Rapid cooling of planetesimal cores has been inferred for several iron
meteorite parent bodies based on metallographic cooling rates, and linked to
the loss of their insulating mantles during impacts. However, the timing of
these disruptive events is poorly constrained. Here, we used the short-lived
107Pd / 107Ag decay... | 2211.08306v1 |
2023-01-02 | Enhance the Field Strength by Adding Soft Iron in the Hybrid Permanent magnet | Permanent magnet has a small and compact structure, is especially suitable
for a narrow space. With the aid of soft iron, the magnetic field can be
increased much more and the field uniformity can be well controlled. Most
Permanent magnets have a symmetry structure; the soft iron can be selected as
the float magnet pol... | 2301.00532v1 |
2023-05-22 | Ion-selective scattering studied by the variable-energy electron irradiation of Ba$_{0.2}$K$_{0.8}$Fe$_2$As$_2$ superconductor | Low-temperature variable-energy electron irradiation was used to induce
non-magnetic disorder in a single crystal of hole-doped iron-based
superconductor, Ba$_{1-x}$K$_x$Fe$_2$As$_2$, $x=$0.80. To avoid systematic
errors, the beam energy was adjusted non-consequently for five values between
1.0 and 2.5 MeV, whence samp... | 2305.13217v1 |
2024-01-16 | Detection of the neutral iron line from the supernova remnant W49B with Suzaku | Recent studies of supernova remnants (SNRs) have revealed that some SNRs
exhibit a neutral iron line emission at 6.4 keV. This line has been proposed to
originate from the interaction of high-energy particles formed in the SNR shell
with the surrounding cold matter. We searched for the neutral iron line
emission in the... | 2401.08234v1 |
1999-07-26 | First Constraints on Iron Abundance versus Reflection Fraction from the Seyfert~1 Galaxy MCG--6-30-15 | We report on a joint ASCA and RXTE observation spanning an $\sim$ 400~ks time
interval of the bright Seyfert~1 galaxy MCG--6-30-15. The data clearly confirm
the presence of a broad skewed iron line ($W_{K\alpha} \sim$ 266 eV) and
Compton reflection continuum at higher energies reported in our previous paper.
We also in... | 9907352v1 |
1999-12-01 | On the lack of X-ray iron line reverberation in MCG-6-30-15: Implications for the black hole mass and accretion disk structure | We use the method of Press, Rybicki & Hewitt (1992) to search for time lags
and time leads between different energy bands of the RXTE data for MCG-6-30-15.
We tailor our search in order to probe any reverberation signatures of the
fluorescent iron Kalpha line that is thought to arise from the inner regions of
the black... | 9912001v1 |
2003-10-29 | The XMM-Newton Iron Line Profile of NGC 3783 | We report on observations of the iron K line in the nearby Seyfert 1 galaxy,
NGC 3783, obtained in a long, 2 orbit (240 ks) XMM-Newton observation. The line
profile obtained exhibits two strong narrow peaks at 6.4 keV and at 7.0 keV,
with measured line equivalent widths of 120 and 35 eV respectively. The 6.4 keV
emissi... | 0310820v1 |
2006-09-25 | Tracing the evolution in the iron content of the ICM | We present a Chandra analysis of the X-ray spectra of 56 clusters of galaxies
at z>0.3, which cover a temperature range 3<kT<15 keV. Our analysis is aimed at
measuring the iron abundance in the intra-cluster medium (ICM) out to the
highest redshift probed to date. We made use of combined spectral analysis
performed ove... | 0609664v3 |
2006-10-31 | Tracing the evolution in the iron content of the ICM | We present a Chandra analysis of the X-ray spectra of 56 clusters of galaxies
at z>0.3, which cover a temperature range of 3>kT>15 keV. Our analysis is aimed
at measuring the iron abundance in the ICM out to the highest redshift probed
to date. We find that the emission-weighted iron abundance measured within
(0.15-0.3... | 0610940v1 |
2007-03-12 | Evolution in the iron abundance of the ICM | We present a Chandra analysis of the X-ray spectra of 56 clusters of galaxies
at $z>0.3$, which cover a temperature range of $3> kT > 15$ keV. Our analysis
is aimed at measuring the iron abundance in the ICM out to the highest redshift
probed to date. We find that the emission-weighted iron abundance measured
within $(... | 0703261v1 |
2009-06-17 | Fabrication and characterization of iron pnictide wires and bulk materials through the powder-in-tube method | The recent discovery of superconductivity in the iron based superconductors
with very high upper critical fields presents a new possibility for practical
applications, but fabricating fine-wire is a challenge because of mechanically
hard and brittle powders and the toxicity and volatility of arsenic. In this
paper, we ... | 0906.3114v1 |
2012-04-20 | The Carina Project. V. The impact of NLTE effects on the iron content | We have performed accurate iron abundance measurements for 44 red giants
(RGs) in the Carina dwarf spheroidal (dSph) galaxy. We used archival,
high-resolution spectra (R~38,000) collected with UVES at ESO/VLT either in
slit mode (5) or in fiber mode (39, FLAMES/GIRAFFE-UVES). The sample is more
than a factor of four la... | 1204.4612v2 |
2014-08-15 | Protected Fe valence in quasi-two dimensional $α$-FeSi$_2$ | We report the first comprehensive study of the high temperature form
($\alpha$-phase) of iron disilicide. Measurements of the magnetic
susceptibility, magnetization, heat capacity and resistivity were performed on
well characterized single crystals. With a nominal iron $d^6$ configuration,
and a quasi-two dimensional c... | 1408.3606v2 |
2016-07-04 | Origin of the Characteristic X-ray Spectral Variations of IRAS 13224$-$3809 | The Narrow-line Seyfert 1 galaxy (NLS1) IRAS 13224$-$3809 is known to exhibit
significant X-ray spectral variation, a sharp spectral drop at $\sim$ 7 keV,
strong soft excess emission, and a hint of iron L-edge feature, which is very
similar to the NLS1 1H 0707$-$495. We have proposed the "Variable Double
Partial Coveri... | 1607.00879v1 |
2017-08-05 | Nematic Fluctuations in Iron-Oxychalcogenide Mott Insulators | Nematic fluctuations occur in a wide range of physical systems from liquid
crystals to biological molecules to solids such as exotic magnets, cuprates and
iron-based high-$T_c$ superconductors. Nematic fluctuations are thought to be
closely linked to the formation of Cooper-pairs in iron-based superconductors.
It is un... | 1708.01693v4 |
2020-01-22 | Superconductivity by Hidden Spin Fluctuations in Electron-Doped Iron Selenide | Berg, Metlitski and Sachdev, Science 338, 1606 (2012), have shown that the
exchange of hidden spin fluctuations by conduction electrons with two orbitals
can result in high-temperature superconductivity in copper-oxide materials. We
introduce a similar model for high-temperature iron-selenide superconductors
that are e... | 2001.07908v3 |
2020-04-25 | Reconciliation of experiments and theory on transport properties of iron and the geodynamo | The amount of heat transport from the core, which constrains the dynamics and
thermal evolution of the region, depends on the transport properties of iron.
Ohta et al.(2016) and Konopkova et al.(2016) measured electrical resistivity
and thermal conductivity of iron, respectively, in laser-heated diamond anvil
cells (DA... | 2004.12035v1 |
2020-09-29 | The iron record of asteroidal processes in carbonaceous chondrites | The valence of iron has been used in terrestrial studies to trace the
hydrolysis of primary silicate rocks. Here, we use a similar approach to
characterize the secondary processes, namely thermal metamorphism and aqueous
alteration, that have affected carbonaceous chondrites. X-ray absorption
near-edge structure spectr... | 2009.13950v2 |
2020-09-30 | DEEPMIR: A DEEP neural network for differential detection of cerebral Microbleeds and IRon deposits in MRI | Lobar cerebral microbleeds (CMBs) and localized non-hemorrhage iron deposits
in the basal ganglia have been associated with brain aging, vascular disease
and neurodegenerative disorders. Particularly, CMBs are small lesions and
require multiple neuroimaging modalities for accurate detection. Quantitative
susceptibility... | 2010.00148v3 |
2022-01-31 | Green steel at its crossroads: hybrid hydrogen-based reduction of iron ores | Iron- and steelmaking cause ~7% of the global CO2 emissions, due to the use
of carbon for the reduction of iron ores. Replacing carbon by hydrogen as the
reductant offers a pathway to reduce emissions. However, production of hydrogen
using renewable energy will remain a bottlenecks, because making the annual
crude stee... | 2201.13356v1 |
2022-03-09 | Accounting for iron-related off-target binding effects of 18F-AV1451 PET in the evaluation of cognition and microstructure in APOE-e4+ MCI | The pathology of Alzheimer's disease (AD) and mild cognitive impairment (MCI)
is characterized by the presence of beta-amyloid extracellular plaques and
neurofibrillary tangles containing hyper-phosphorylated tau. Individuals
carrying the apolipoprotein E-e4 (APOE-e4) allele are at increased risk of
cognitive decline a... | 2203.16444v1 |
2022-12-13 | On the surface chemisorption of oxidizing fine iron particles: insights gained from molecular dynamics simulations | Molecular dynamics (MD) simulations are performed to investigate the thermal
and mass accommodation coefficients (TAC and MAC, respectively) for the
combination of iron(-oxide) and air. The obtained values of TAC and MAC are
then used in a point-particle Knudsen model to investigate the effect of
chemisorption and the ... | 2212.06432v2 |
1995-06-20 | On the Bilayer Coupling in the Yttrium-Barium Family of High Temperature Superconductors | We present and solve a model for the susceptibility of two CuO2 planes
coupled by an interplane coupling J_perp and use the results to analyze a
recent "cross-relaxation" NMR experiment on Y2Ba4Cu7O15. We deduce that in this
material the product of J_perp and the maximum value of the in-plane
susceptibility chi_max var... | 9506088v1 |
1996-06-04 | On the Bilayer Coupling in the Yttrium-Barium Family of High Temperature Superconductors | We derive the expressions needed to interpret experiments relating to
interplane magnetic coupling in YBa$_{2}$Cu$_{3}$O$_{6+x}$ and related
materials, and use the results to interpret measurements of the optical magnon
energy in YBa_{2}Cu_{3}O_{6.2} and of the NMR ``cross-relaxation" rate in
Y_2Ba_{4}Cu_{7}O_{15}. We ... | 9606008v2 |
1997-01-29 | Local structure studies of the underdoped-overdoped transition in YBa_2Cu_3O_x. Measurement of the yttrium y-ray absorption fine structure | We have measured the extended x-ray absorption-fine-structure (EXAFS) at the
Y-K edge of YBa_2Cu_3O_x for x=6.801, 6.947, 6.968, 6.984 at T=20-300 K. Across
the underdoped-overdoped transition the Y-Cu2 pairs exhibit harmonic vibrations
which freeze out in the superconducting phase, whereas the Y-O2,3 pairs exhibit
str... | 9701208v1 |
2000-10-06 | Magnetic relaxation phenomena and cluster glass properties of La{0.7-x}Y{x}Ca{0.3}MnO{3} manganites | The dynamic magnetic properties of the distorted perovskite system
La{0.7-x}Y{x}Ca{0.3}MnO{3} (0 <= x <= 0.15) have been investigated by
ac-susceptibility and dc magnetization measurements, with emphasis on
relaxation and aging studies. They evidence for x >= 0.10 the appearance of a
metallic cluster glass phase, that ... | 0010110v2 |
2001-04-22 | Nonadiabatiic superconductivity in MgB2 and cuprates | The Fermi energy, Ef of newly discovered high-Tc superconductor MgB2 and
cuprates is estimated from the measured London penetration depth using a
parameter-free expression. Ef of MgB2 and more than 30 lanthanum, yttrium and
mercury-based cuprates appears to be about or below 100 meV, depending on
doping. There is every... | 0104413v1 |
2001-05-07 | Possibility of the investigation of the X-ray diffraction patterns for yttrium ceramic YBa2Cu3Ox having different oxygen stoichiometry on the basis of the mixed-layer crystal model | In view of the strong anisotropy of oxygen diffusion in high-Tc ceramic
YBa2Cu3Ox, it is supposed that a polycrystalline sample of this material can be
presented as consisting of crystal grains where each grain was formed by a
certain sequence of layers with tetragonal or orthorhombic phase structure. The
theory of sca... | 0105133v1 |
2002-09-12 | Electron momentum density in yttrium | A simultaneous analysis of high-resolution directional Compton profiles and
two-dimensional angular correlation of positron annihilation experimental data
has been performed by studying both a directional anisotropy of measured
spectra and reconstructed densities. The results were compared with theoretical
fully-relati... | 0209297v1 |
2003-06-23 | Disorder effects at low temperatures in La_{0.7-x}Y_{x}Ca_{0.3}MnO_{3} manganites | With the aim of probing the effect of magnetic disorder in the
low-temperature excitations of manganites, specific-heat measurements were
performed in zero field, and in magnetic fields up to 9 T in polycrystalline
samples of La_{0.7-x}Y_{x}Ca_{0.3}MnO_{3}, with Y concentrations x=0, 0.10, and
0.15. Yttrium doping yiel... | 0306582v1 |
2004-10-01 | Magnetic Properties of Cuprate Perovskites | The magnetic susceptibility of underdoped yttrium and lanthanum cuprates is
interpreted based on the self-consistent solution of the t-J model of a Cu-O
plane. The calculations reproduce correctly the frequency dependencies of the
susceptibility in YBa2Cu3O_{7-y} and La_{2-x}Sr_xCuO4 attributing their
dissimilarity to ... | 0410009v1 |
2005-02-18 | Accuracy of ab initio methods in predicting the crystal structures of metals: review of 80 binary alloys | Predicting and characterizing the crystal structure of materials is a key
problem in materials research and development. We report the results of ab
initio LDA/GGA computations for the following systems: AgAu, AgCd, AgMg, AgMo*,
AgNa, AgNb*, AgPd, AgRh*, AgRu*, AgTc*, AgTi, AgY, AgZr, AlSc, AuCd, AuMo*,
AuNb, AuPd, AuP... | 0502465v1 |
2005-08-27 | The thermodynamic stability and hydration enthalpy of strontium cerate doped by yttrium | The standard molar enthalpy of formation of SrY0.05Ce0.95O2.975 has been
derived by combining the enthalpy of solution of this compound in 1 M HCl + 0.1
KI obtained by us and auxiliary literature data. The following value has been
derived: DfH (SrY0.05Ce0.95O2.975, s, 298.15 K) = -1720.4 (3.4) kJ/mol. The
obtained valu... | 0508654v1 |
2005-10-21 | Superconductivity mediated by a soft phonon mode: specific heat, resistivity, thermal expansion and magnetization of YB6 | The superconductor YB6 has the second highest critical temperature Tc among
the boride family MBn. We report measurements of the specific heat,
resistivity, magnetic susceptibility and thermal expansion from 2 to 300 K,
using a single crystal with Tc = 7.2 K. The superconducting gap is
characteristic of medium-strong c... | 0510572v3 |
2006-07-07 | Polymer-Nanoparticle Complexes : from Dilute Solution to Solid State | We report on the formation and the structural properties of supermicellar
aggregates also called electrostatic complexes, made from mineral nanoparticles
and polyelectrolyte-neutral block copolymers in aqueous solutions. The mineral
particles put under scrutiny are ultra-fine and positively charged yttrium
hydroxyaceta... | 0607182v1 |
2006-12-01 | Two types of Hc2(T) dependences in Bi_2Sr_2Ca_(1-x)Y_xCu_2O_(8+delta) with different Yttrium content | We reanalyze the magnetization data collected on
Bi_2Sr_2Ca_(1-x)Y_xCu_2O_(8+y) samples (Kim at al, Phys. Rev. B 72, 64525
(2005)) and argue that the method, which was used for the analysis of
equilibrium magnetization data, is not adequate to the experimental situation.
As a result, the temperature dependencies of the... | 0612031v1 |
2007-03-20 | Steric quenching of the switchable mirror effect Phys. Rev. B 75, 104109 (2007) | Scandium was substituted for yttrium to observe the effect of unit cell size
on the optical metal-to-insulator (MIT) transition in the Y_(1-z)Sc_(z)H_(x)
alloy system. The optical transmittance decreases significantly for z>0.10.
Simultaneous electrical resistivity measurements confirm the transition from
trihydride to... | 0703521v1 |
2003-04-07 | Search for quantum transducers between electromagnetic and gravitational radiation: A measurement of an upper limit on the transducer conversion efficiency of yttrium barium copper oxide | A minimal coupling rule for the coupling of the electron spin to curved
spacetime in general relativity suggests the possibility of a coupling between
electromagnetic and gravitational radiation mediated by means of a quantum
fluid. Thus quantum transducers between these two kinds of radiation fields
might exist. We re... | 0304026v1 |
2007-07-24 | Terahertz spectroscopy of electromagnons in Eu_{1-x}Y_xMnO_3 | Dielectric permittivity spectra of yttrium-doped EuMnO$_3$ in the composition
range 0 =< x =< 0.5 have been investigated in the terahertz frequency range.
Magnetoelectric contributions to the permittivity were observed in all
compositions for ac electric fields parallel to the crystallographic a-axis.
Well defined elec... | 0707.3614v1 |
2007-11-10 | Ab initio calculations of the electronic structure of cuprates using large scale cluster techniques | The local electronic structures of La2CuO4, three members of the
Yttrium-family (YBa2Cu3O6, YBa2Cu3O7, and YBa2Cu4O8), and to some extent of
Nd2CuO4 have been determined using all-electron ab-initio cluster calculations
for clusters comprising up to thirteen planar copper atoms associated with
their nearest planar and ... | 0711.1606v1 |
2009-01-16 | Surface superconducting states in yttrium hexaboride single crystal in a tilted magnetic field | We present the results of an experimental study of the nucleation of
superconductivity at the surface of a single crystal YB$_6$ in a tilted dc
magnetic field. A recently developed experimental technique allowed us to
determine $H_{c3}$ at each side of the sample as a function of the angle
between the dc magnetic field... | 0901.2544v2 |
2009-12-23 | The effect of anomalous adsorption of H2O and CO2 by pre-hydrated YBa_2Cu_3O_{6.53} | The results of a comprehensive study on the YBa_2Cu_3O_{6.53} oxide subjected
to "mild" hydration (exposure at small values of pH2O) by a special technique
have been reported. The material modified in this way acquires an interesting
property; namely, in natural conditions it intensively absorbs large quantities
of com... | 0912.4601v1 |
2011-03-23 | Numerical Simulation of Magnetic Interactions in Polycrystalline YFeO3 | The magnetic behavior of polycrystalline yttrium orthoferrite was studied
from the experimental and theoretical points of view. Magnetization
measurements up to 170 kOe were carried out on a single-phase YFeO3 sample
synthesized from heterobimetallic alkoxides. The complex interplay between
weak-ferromagnetic and antif... | 1103.4462v1 |
2011-04-07 | Electrostatic Control of the Evolution from Superconductor to Insulator in Ultrathin Films of Yttrium Barium Copper Oxide | The electrical transport properties of ultrathin YBCO films have been
modified using an electric double layer transistor configuration employing an
ionic liquid. The films were grown on SrTiO3 substrates using high pressure
oxygen sputtering. A clear evolution from superconductor to insulator was
observed in nominally ... | 1104.1357v1 |
2011-08-22 | Adler-Bell-Jackiw anomaly in Weyl semi-metals: Application to Pyrochlore Iridates | Weyl semimetals are three dimensional analogs of graphene where the energy of
the excitations are a linear function of their momentum. Pyrochlore Iridates
$(A_{2}Ir_{2}O_{7})$ with A =yttrium or lanthanide element) are conjectured to
be examples of such a system, with the low energy physics described by twenty
four Wey... | 1108.4426v2 |
2012-01-19 | Quantum storage of polarization qubits in birefringent and anisotropically absorbing materials | Storage of quantum information encoded into true single photons is an
essential constituent of long-distance quantum communication based on quantum
repeaters and of optical quantum information processing. The storage of
photonic polarization qubits is, however, complicated by the fact that many
materials are birefringe... | 1201.4097v3 |
2012-04-16 | Nonlinear Induction Detection of Electron Spin Resonance | We present a new approach to the induction detection of electron spin
resonance (ESR) signals exploiting the nonlinear properties of a
superconducting resonator. Our experiments employ a yttrium barium copper oxide
(YBCO) superconducting stripline microwave (MW) resonator integrated with a
microbridge. A strong nonline... | 1204.3588v2 |
2012-06-27 | Effect of lattice volume and strain on the conductivity of BaCeY-oxide ceramic proton conductors | In-situ electrochemical impedance spectroscopy was used to study the effect
of lattice volume and strain on the proton conductivity of the yttrium-doped
barium cerate proton conductor by applying the hydrostatic pressure up to 1.25
GPa. An increase from 0.62 eV to 0.73 eV in the activation energy of the bulk
conductivi... | 1206.6287v1 |
2012-09-18 | Magneto-optical trapping of diatomic molecules | The development of the magneto-optical trap revolutionized the fields of
atomic and quantum physics by providing a simple method for the rapid
production of ultracold, trapped atoms. A similar technique for producing a
diverse set of dense, ultracold diatomic molecular species will likewise
transform the study of stron... | 1209.4069v1 |
2013-03-06 | Crystal field with Wannier functions: Application to rare-earth aluminates | A method to calculate the crystal field parameters {\it ab initio} is
proposed and applied to trivalent rare earth impurities in yttrium aluminate
and to Tb$^{3+}$ ion in TbAlO$_3$. To determine crystal field parameters local
Hamiltonian expressed in basis of Wannier functions is expanded in a series of
spherical tenso... | 1303.1281v3 |
2013-03-29 | Point-contact spectroscopy of the phononic mechanism of superconductivity in YB6 | Lortz et al. [Phys. Rev. B 73, 024512 (2006)] have utilized specific heat and
resistivity measurements as "thermal spectroscopies" to deconvolve the spectrum
of the electron-phonon interaction in YB$_6$ assuming a major role of the low
frequency phonon mode in mediating superconductivity. Here, we present direct
point-... | 1303.7321v1 |
2013-07-23 | Solution calorimetry investigations of new phase BaCe0.6Y0.3In0.1O2.8 | The preparation of BaCeO3 doped by yttrium and indium oxides
(BaCe0.6Y0.3In0.1O2.8) has been performed by solid-state reaction from BaCO3,
CeO2, Y2O3, In2O3. The compound BaCe0.6Y0.3In0.1O2.8 has been synthesized for
the first time. The X-ray measurements have showed that BaCe0.6Y0.3In0.1O2.8
has an orthorhombic struct... | 1307.5940v1 |
2013-08-27 | Nuclear beta decay with Lorentz violation | We consider the possibility of Lorentz-invariance violation in weak-decay
processes. We present a general approach that entails modifying the W-boson
propagator by adding a Lorentz-violating tensor to it. We describe the effects
of Lorentz violation on nuclear beta decay in this scenario. In particular we
show the expr... | 1308.5829v2 |
2013-09-16 | Results on damage induced by high-energy protons in LYSO calorimeter crystals | Lutetium-Yttrium Orthosilicate doped with Cerium (LYSO:Ce), as a bright
scintillating crystal, is a candidate for calorimetry applications in strong
ionizing-radiation fields and large high-energy hadron fluences as are expected
at the CERN Large Hadron Collider after the planned High-Luminosity upgrade.
There, proton-... | 1309.3872v2 |
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