publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2005-11-16 | Spin Hamiltonian, Competing Small Energy Scales and Incommensurate Long Range Order in the Highly Frustrated Gd3Ga5O12 Garnet Antiferromagnet | Despite the availability of a spin Hamiltonian for the Gd3Ga5O12 garnet (GGG)
for over twenty five years, there has so far been little theoretical insight
regarding the many unusual low temperature properties of GGG. Here we
investigate GGG in zero magnetic field using mean-field theory. We reproduce
the spin liquid-li... | 0511403v2 |
2006-11-20 | Ill-Behaved Convergence of a Model of the Gd3Ga5O12 Garnet Antiferromagnet with Truncated Magnetic Dipole-Dipole Interactions | Previous studies have found that calculations which consider long-range
magnetic dipolar interactions truncated at a finite cut-off distance Rc predict
spurious (unphysical) long-range ordered phases for Ising and Heisenberg
systems on the pyrochlore lattice. In this paper we show that, similar to these
two cases, calc... | 0611531v1 |
2009-06-29 | A Magnetization Sensitive Potential at Garnet-Metal Interfaces | We investigate a magnetization-dependent voltage that appears at the
interface between garnets and various metals. The voltage is even in the
applied magnetic field and is dependent on the surface roughness and the
pressure holding the surfaces together. Large variations in the size, sign and
magnetic dependence are ob... | 0906.5340v2 |
2010-06-15 | Juxtaposition of Spin Freezing and Long Range Order in a Series of Geometrically Frustrated Antiferromagnetic Gadolinium Garnets | Specific heat measurements in zero magnetic field are presented on a
homologous series of geometrically frustrated, antiferromagnetic, Heisenberg
garnet systems. Measurements of Gd3Ga5O12, grown with isotopically pure Gd,
agree well with previous results on samples with naturally abundant Gd, showing
no ordering featur... | 1006.2969v2 |
2011-01-13 | Optical identification of hybrid magnetic and electric excitations in Dy3Fe5O12 garnet | Far-infrared spectra of magneto-dielectric Dy3Fe5O12 garnet were studied
between 13 and 100 cm-1 and at low temperatures between 5 and 80 K. A
combination of transmission, reflectivity, and rotating analyzer ellipsometry
was used to unambiguously identify the type of the dipole activity of the
infrared modes. In additi... | 1101.2675v1 |
2011-09-29 | Ratchet effects for paramagnetic beads above striped ferrite-garnet films | We calculate the motion of a small paramagnetic bead which is manipulated by
the stripe domain pattern of a ferrite-garnet film. A model for the bead's
motion in a liquid above the film is developed and used to look for ratchet
solutions, where the bead acquires net coherent motion in one direction when
the external fi... | 1109.6491v1 |
2013-07-26 | Synchronous versus asynchronous transport of a paramagnetic particle in a modulated ratchet potential | We present a combined experimental and theoretical study describing the
dynamical regimes displayed by a paramagnetic colloidal particle externally
driven above a stripe-patterned magnetic garnet film. A circularly polarized
rotating magnetic field modulates the stray field of the garnet film and
generates a translatin... | 1307.7101v1 |
2013-11-01 | Coherent Magnetism and Spin-Orbit Interaction in Garnet Films Probed with Femtosecond Magneto-Optical Four Wave Mixing | We report about the dephasing of the spins states in a Garnet film excited by
femtosecond laser pulses. It is shown that magneto-optical four-wave-mixing
signals are efficiently generated and controlled with an external static
magnetic field. The self-diffraction of either two or three femtosecond pulses
allows us dete... | 1311.0080v1 |
2014-01-22 | Tunable interactions between paramagnetic colloidal particles driven in a modulated ratchet potential | We study experimentally and theoretically the interactions between
paramagnetic particles dispersed in water and driven above the surface of a
stripe patterned magnetic garnet film. An external rotating magnetic field
modulates the stray field of the garnet film and generates a translating
potential landscape which ind... | 1401.5754v1 |
2015-06-23 | Effects of sublattice symmetry and frustration on ionic transport in garnet solid electrolytes | We use rigorous group-theoretic techniques and molecular dynamics to
investigate the connection between structural symmetry and ionic conductivity
in the garnet family of solid Li-ion electrolytes. We identify new ordered
phases and order-disorder phase transitions that are relevant for conductivity
optimization. Ionic... | 1506.07142v1 |
2016-06-22 | Garnet-free optical circulators monolithically integrated on spatially modified III-V quantum wells | Optical circulators are indispensable components in photonic networks that
are aimed to route information in a unidirectional way among their N-ports1,2.
In general, these devices rely on magneto-optical garnets3 with appreciable
Verdet constants that are utilized in conjunction with other elements like
permanent magne... | 1606.06949v1 |
2016-08-07 | Ultrafast photo-magnetic recording in transparent medium | Finding a conceptually new way to control the magnetic state of media with
the lowest possible production of heat and simultaneously at the fastest
possible time-scale is a new challenge in fundamental magnetism [1-4] as well
as an increasingly important issue in modern information technology [5]. Recent
results demons... | 1609.05223v1 |
2017-02-14 | Electromagnetic properties of terbium gallium garnet at millikelvin temperatures and single photon energy | Electromagnetic properties of single crystal terbium gallium garnet (TGG) are
characterised from room down to millikelvin temperatures using the whispering
gallery mode method. Microwave spectroscopy is performed at low powers
equivalent to a few photons in energy and conducted as functions of the
magnetic field and te... | 1702.04081v3 |
2017-05-30 | Enhanced magnetocaloric effect from Cr substitution in Ising lanthanide gallium garnets $Ln_3\text{CrGa}_4\text{O}_{12}$ ($Ln$ = Tb, Dy, Ho) | A detailed study on the crystal structure and bulk magnetic properties of Cr
substituted Ising type lanthanide gallium garnets
$Ln_3\text{CrGa}_4\text{O}_{12}$ ($Ln$ = Tb, Dy, Ho) has been carried out using
room temperature powder X-Ray and neutron diffraction, magnetic susceptibility,
isothermal magnetisation and heat... | 1705.10547v1 |
2018-02-20 | Comparison of the Magnetic properties of Mn3Fe2Si3O12 as a crystalline garnet and as a glass | The crystalline garnet Mn3Fe2Si3O12 and an amorphous phase of the same
nominal composition are synthesized at high pressure. The magnetic properties
of the two forms are reported. Both phases order antiferromagnetically. The
crystalline phase exhibits a Curie-Weiss theta of -47.2 K, with a sharp
ordering transition at ... | 1802.07360v1 |
2018-08-14 | Comments on "Amplifying magneto-optical photonic crystal, Appl. Phys. Lett. 97, 061116 (2010)" | This report concerns analytical solutions predicting the complex refractive
indices of doped crystals, based on empirical values of the refractive indices
of the dopant and the undoped crystal. An analytical approach in calculating
the refractive index of Erbium doped Gadolinium Gallium Garnet was reported by
another a... | 1809.04413v1 |
2018-11-01 | Magnetodielectric effects at quantum critical fields in cobalt-containing garnets | Here we present a comparative study of the magnetic and crystal chemical
properties of two Co2+ containing garnets, NaCa2Co2V3O12 and CaY2Co2Ge3O12.
Both phases exhibit the onset of antiferromagnetic order at 8K and 6K
respectively, as well as field-induced transitions in their magnetization at 1T
and around 11 T. We f... | 1811.00165v1 |
2019-07-01 | Structural phase diagram and magnetic properties of Sc-substituted rare earth ferrites R1-xScxFeO3 (R=Lu, Yb, Er, and Ho) | We have studied the structural stability of Sc-substituted rare earth (R)
ferrites R1-xScxFeO3, and constructed a structural phase diagram for different
R and x. While RFeO3 and ScFeO3 adopt the orthorhombic and the bixbyite
structure respectively, the substituted compound R1-xScxFeO3 may be stable in a
different struc... | 1907.01052v1 |
2019-08-09 | Modeling Spin Dynamics in the Singlet Ground State Garnet Ho3Ga5O12 | Materials containing non-Kramers magnetic ions can show unusual quantum
excitations because of the exact mapping of the two-singlet crystal-field
ground state to a quantum model of Ising spins in a transverse magnetic field.
Here, we model the magnetic excitation spectrum of garnet-structured Ho3Ga5O12,
which has a two... | 1908.03530v1 |
2020-08-26 | Hybrid Polymer-Garnet Materials for All-Solid-State Energy Storage Devices | Hybrid electrolyte materials comprising polymer-ionic salt matrixes embedded
with garnet particles constitute a promising class of materials for the
realization of all-solid-state batteries. In addition to providing solutions to
the safety issues inherent to current liquid electrolytes, hybrid polymer
electrolytes offe... | 2008.11855v2 |
2021-09-13 | Model of the low temperature magnetic phases of gadolinium gallium garnet | The magnetic behaviour of gadolinium gallium garnet in an external magnetic
field at zero temperature is considered. For high fields a classical spin model
of the gadolinium ions predicts a spin configuration that is periodic at the
level of the smallest repeating unit cell. The quantum version of the model is
treated ... | 2109.05827v1 |
2023-03-18 | Antiferromagnetism and Ising Ground States in the Rare-earth Garnet Nd$_3$Ga$_5$O$_{12}$ | In this paper, we investigate the low temperature magnetic properties of the
rare-earth garnet compound Nd$_3$Ga$_5$O$_{12}$ in detail by means of
magnetization, specific heat and magnetocaloric effect measurements. The
magnetic thermal properties along with the crystal field calculations reveal
that the Nd$^{3+}$ ions... | 2303.10405v1 |
2023-11-11 | Optimizing the tuning range of the Fermilab Recycler 53MHz RF cavities by exploiting the avoided crossing of the tuner and cavity modes | The electromagnetic eigenmodes of the Fermilab Recycler RF cavities were
simulated with ACE3P running on NERSC's 'Perlmutter' supercomputer in an
attempt to optimize their tuning range to comfortably support slip-stacking. A
theory, based on coupled circuits and avoided crossings, was developed to
explain the origins o... | 2311.06571v1 |
2010-05-17 | Vertical stratification of iron in atmospheres of blue horizontal-branch stars | The aim of this study is to search for observational evidence of vertical
iron stratification in the atmosphere of fourteen blue horizontal-branch (BHB)
stars. We have found from our numerical simulations that five BHB stars: B22,
B186 in the globular cluster NGC 288, WF2-820, WF2-2692 in M13 and B203 in M15
show clear... | 1005.2974v1 |
2011-01-04 | The effect of varying Fe-content on transport properties of K intercalated iron selenide KxFe2-ySe2 | We report the successful growth of high-quality single crystals of potassium
intercalated iron selenide KxFe2-ySe2 by Bridgeman method. The effect of iron
vacancies on transport properties was investigated by electrical resistivity
and magnetic susceptibility measurements. With varying iron content, the system
passes f... | 1101.0789v1 |
2011-07-30 | Phase Separation and Magnetic Order in K-doped Iron Selenide Superconductor | Alkali-doped iron selenide is the latest member of high Tc superconductor
family, and its peculiar characters have immediately attracted extensive
attention. We prepared high-quality potassium-doped iron selenide (KxFe2-ySe2)
thin films by molecular beam epitaxy and unambiguously demonstrated the
existence of phase sep... | 1108.0069v1 |
2011-10-04 | Transition metal impurity effect on charge and spin density in iron: Ab initio calculations and comparison with Mössbauer data | Density functional theory was applied to study influence of the isolated
impurity located on the regular site of the alpha-Fe crystal on the charge and
spin density (hyperfine interactions) on the iron nucleus. Calculations were
performed by using both pseudopotential and the full potential methods. The
scalar relativi... | 1110.0717v1 |
2013-07-23 | Exploration of iron-chalcogenide superconductors | Iron-chalcogenide compounds with FeSe(Te, S) layers did not attract much
attention until the discovery of high-Tc superconductivity (SC) in the
iron-pnictide compounds at the begining of 2008. Compared with FeAs-based
superconductors, iron-chalcogenide superconductors have aroused enormous
enthusiasm to study the relat... | 1307.5991v1 |
2015-08-18 | Elucidating the magnetic and superconducting phases in the alkali metal intercalated iron chalcogenides | The complex interdigitated phases have greatly frustrated attempts to
document the basic features of the superconductivity in the alkali metal
intercalated iron chalcogenides. Here, using elastic neutron scattering,
energy-dispersive x-ray spectroscopy, and resistivity measurements, we
elucidate the relations of these ... | 1508.04482v1 |
2018-02-16 | Manipulating surface magnetic order in iron telluride | Control of emergent magnetic orders in correlated electron materials promises
new opportunities for applications in spintronics. For their technological
exploitation, it is important to understand the role of surfaces and interfaces
to other materials and their impact on the emergent magnetic orders. Here, we
demonstra... | 1802.05978v2 |
2022-02-17 | Pressure-induced superconductivity in iron-based spin-ladder compound BaFe2+δ(S1-Sex)3 | The iron-based superconductors had a significant impact on condensed matter
physics. They have a common structural motif of a two-dimensional square iron
lattice and exhibit fruitful physical properties as a strongly correlated
electron system. During the extensive investigations, quasi-one-dimensional
iron-based spin-... | 2202.08525v1 |
2022-06-15 | Anomalous Ettingshausen effect in iron-carbon alloys | We have investigated the anomalous Ettingshausen effect (AEE) in iron-carbon
alloys, i.e., cast irons and steel, using the lock-in thermography. All the
alloys exhibit the clear AEE-induced temperature modulation, and their
anomalous Ettingshausen coefficient is an order of magnitude greater than that
of the pure iron ... | 2206.07322v2 |
2003-10-29 | On the Iron content in rich nearby Clusters of Galaxies | In this paper we study the iron content of a sample of 22 nearby hot clusters
observed with BeppoSAX. We find that the global iron mass of clusters is
tightly related to the cluster luminosity and that the relatively loose
correlation between the iron mass and the cluster temperature follows from the
combination of the... | 0310828v1 |
2005-05-26 | Thermal Evolution of Supernova Iron in Elliptical Galaxies | In explaining the relative metal abundances observed in galaxy groups and
clusters, it is generally assumed that all metals created by supernovae are
present either in visible stars or the hot gas. We discuss here the possibility
that some of the iron expelled into the hot gas by Type Ia supernovae may have
radiatively... | 0505527v1 |
2005-12-16 | A Magnetic and Moessbauer Spectral Study of Core/Shell Structured Fe/Au Nanoparticles | Fe/Au nanoparticles have been chemically synthesized through a reverse
micelle reaction and investigated by both conventional and synchrotron based
x-ray diffraction and by magnetic and Moessbauer spectral studies. The powder
x-ray diffraction patterns reveal both the presence of crystalline alpha-iron
and gold and the... | 0512413v1 |
2006-09-15 | Magnetic properties of iron nanoparticles prepared by exploding wire technique | Nanoparticles of iron were prepared in distilled water using very thin iron
wires and sheets, by the electro-exploding wire technique. Transmission
electron microscopy reveals the size of the nanoparticles to be in the range 10
to 50 nm. However, particles of different sizes can be segregated by using
ultrahigh centrif... | 0609370v1 |
2008-12-08 | The Iron abundance in Galactic Planetary Nebulae | We constrain the iron abundance in a sample of 33 low-ionization Galactic
planetary nebulae (PNe) using [Fe III] lines and correcting for the
contribution of higher ionization states with ionization correction factors
(ICFs) that take into account uncertainties in the atomic data. We find very
low iron abundances in al... | 0812.1578v2 |
2010-06-25 | Missing Iron Problem and Type Ia Supernova Enrichment of Hot Gas in Galactic Spheroids | Type Ia supernovae (Ia SNe) provide a rich source of iron for hot gas in
galactic stellar spheroids. However, the expected super-solar iron abundance of
the hot gas is not observed. Instead, X-ray observations often show decreasing
iron abundance toward galactic central regions, where the Ia SN enrichment is
expected t... | 1006.4976v1 |
2014-05-16 | A hidden reservoir of Fe/FeS in interstellar silicates? | The depletion of iron and sulphur into dust in the interstellar medium and
the exact nature of interstellar amorphous silicate grains is still an open
question. We study the incorporation of iron and sulphur into amorphous
silicates of olivine- and pyroxene-type and their effects on the dust
spectroscopy and thermal em... | 1405.4208v1 |
2014-07-05 | Fingering convection induced by atomic diffusion in stars: 3D numerical computations and applications to stellar models | Iron-rich layers are known to form in the stellar subsurface through a
combination of gravitational settling and radiative levitation. Their presence,
nature and detailed structure can affect the excitation process of various
stellar pulsation modes, and must therefore be modeled carefully in order to
better interpret ... | 1407.1437v1 |
2021-06-27 | Pulsating iron spectral features in the emission of X-ray pulsar V0332+53 | We present results of phase- and time-resolved study of iron spectral
features in the emission of the Be/X-ray transient pulsar V0332+53, during its
type II outburst in 2004 using archival RXTE/PCA data. Coherent pulsations of
both fluorescent iron line at {\approx}6.4 keV and neutral iron K-edge at
{\approx}7.1 keV ha... | 2106.14261v1 |
2021-09-21 | Iron Rain: measuring the occurrence rate and origin of small iron meteoroids at Earth | We report results of a four-year survey using Electron Multiplied Charged
Coupled Device (EMCCD) cameras recording 34761 two-station video meteor events
complete to a limiting magnitude of +6. The survey goal was to characterize
probable iron meteoroids. Using only physical properties of the meteor
trajectories includi... | 2109.10265v1 |
2010-11-21 | Why the knee at 100 PeV could not be seen? | It is shown that a "second (iron) knee" in cosmic ray spectrum expected at
energy about 100 PeV could not probably be found there. The reason is very
simple: the position of the "iron knee" depends on an answer to the questions:
"What do we see at 3-5 PeV? Is the knee seen at this energy associated with
proton or iron ... | 1011.4695v1 |
2015-04-20 | Iron-Based Superconductors: current status of materials and pairing mechanism | Since the discovery of high Tc iron-based superconductors in early 2008, more
than 15,000 papers have been published as a result of intensive research. This
paper describes the current status of iron-based superconductors (IBSC)
covering most up-to-date research progress along with the some background
research, focusin... | 1504.04919v1 |
2021-08-05 | The electron-phonon coupling constant and the Debye temperature in polyhydrides of thorium, hexadeuteride of yttrium, and metallic hydrogen phase III | Milestone experimental discovery of superconductivity above 200 K in
highly-compressed sulphur hydride by Drozdov (Nature 525, 73 (2015)) sparked
experimental and theoretical investigations of metallic hydrides. Since then, a
dozen of superconducting binary and ternary polyhydrides have been discovered.
For instance, t... | 2108.02610v4 |
2023-07-21 | Ultra-fast yttrium hydride chemistry at high pressures via non-equilibrium states induced by x-ray free electron laser | Controlling the formation and stoichiometric content of desired phases of
materials has become a central interest for the study of a variety of fields,
notably high temperature superconductivity under extreme pressures. The further
possibility of accessing metastable states by initiating reactions by x-ray
triggered me... | 2307.11293v1 |
1999-06-08 | Radiative Levitation in Hot Horizontal Branch Stars | There is now considerable evidence that horizontal branch (HB) stars hotter
than about 11,500 K experience an enormous enhancement of their photospheric
iron abundance due to radiative levitation. In globular clusters, the
photospheric iron abundance can reach values of [Fe/H] ~ +0.3, or up to two
orders of magnitude h... | 9906123v1 |
1999-06-14 | Iron line afterglows: general constraints | The discovery of a powerful and transient iron line feature in the X-ray
afterglow spectra of gamma-ray bursts would be a major breakthrough for
understanding the nature of their progenitors, strongly suggesting the presence
of a large, iron rich, mass in the vicinity of the burst event.
Model-independent limits to the... | 9906234v1 |
1999-06-14 | Iron line afterglows: how to produce them | We discuss how a powerful iron line emission can be produced if ~1-5 iron
rich solar masses are concentrated in the close vicinity of the burst.
Recombination, thermal and fluorescent reflection are discussed. We find that
recombination suffers the high Compton temperature of the plasma while the
other two scenarios ar... | 9906235v1 |
2003-01-31 | Non-collinear magnetism in iron at high pressures | Using a first principles based, magnetic tight-binding total energy model,
the magnetization energy and moments are computed for various ordered spin
configurations in the high pressure polymorphs of iron (fcc, or $\gamma$-Fe,
and hcp, or $\epsilon$-Fe), as well ferromagnetic bcc iron ($\alpha$-Fe). For
hcp, a non-coll... | 0301615v1 |
2004-01-16 | Ferromagnetism in Fe-doped SnO2 thin films | Thin films grown by pulsed-laser deposition from targets of Sn0.95Fe0.05O2
are transparent ferromagnets with Curie temperature and spontaneous
magnetization of 610 K and 2.2 Am2kg-1, respectively. The 57Fe Mossbauer
spectra show the iron is all high-spin Fe3+ but the films are magnetically
inhomogeneous on an atomic sc... | 0401293v1 |
2008-07-29 | The effect of pressure and spin on the isotopic composition of ferrous iron dissolved in periclase and silicate perovskite | We perform density functional calculations of the equilibrium 57Fe/54Fe
ratios for ferrous iron dissolved in periclase and MgSiO3 perovskite at the
pressures and temperatures of the Earth's mantle. Pressure increases the
partitioning of 57Fe into both phases by a factor of three from the Earth's
surface to the core-man... | 0807.4742v1 |
2008-08-13 | Coreless Terrestrial Exoplanets | Differentiation in terrestrial planets is expected to include the formation
of a metallic iron core. We predict the existence of terrestrial planets that
have differentiated but have no metallic core--planets that are effectively a
giant silicate mantle. We discuss two paths to forming a coreless terrestrial
planet, wh... | 0808.1908v1 |
2009-07-01 | Role of soft-iron impellers on the mode selection in the VKS dynamo experiment | A crucial point for the understanding of the von-K\'arm\'an-Sodium (VKS)
dynamo experiment is the influence of soft-iron impellers. We present numerical
simulations of a VKS-like dynamo with a localized permeability distribution
that resembles the shape of the flow driving impellers. It is shown that the
presence of so... | 0907.0123v2 |
2009-08-08 | A Unified Description of Cuprate and Iron Arsenide Superconductors | We propose a unified description of cuprate and iron-based superconductivity.
Consistency with magnetic structure inferred from neutron scattering implies
significant constraints on the symmetry of the pairing gap for the iron-based
superconductors. We find that this unification requires the orbital pairing
formfactors... | 0908.1147v1 |
2009-08-27 | A new 111 type iron pnictide superconductor LiFeP | A new iron pnictide LiFeP superconductor was found. The compound crystallizes
into a Cu2Sb structure containing an FeP layer showing superconductivity with
maximum Tc of 6K. This is the first 111 type iron pnictide superconductor
containing no arsenic. The new superconductor is featured with itinerant
behavior at norma... | 0908.4043v1 |
2009-08-29 | Spin-Phonon Coupling in Iron Pnictide Superconductors | The magnetic moment in the parent phase of the iron-pnictide superconductors
varies with composition even when the nominal charge of iron is unchanged. We
propose the spin-lattice coupling due to the magneto-volume effect as the
primary origin of this effect, and formulate a Landau theory to describe the
dependence of ... | 0908.4361v1 |
2011-10-03 | Calculated phonon spectra of paramagnetic iron at the alpha-gamma phase transition | We compute lattice dynamical properties of iron at the bcc-fcc phase
transition using dynamical mean-field theory implemented with the frozen-phonon
method. Electronic correlations are found to have a strong effect on the
lattice stability of paramagnetic iron in the bcc phase. Our results for the
structural phase stab... | 1110.0439v1 |
2013-07-22 | Angle-resolved photoemission spectroscopy study on iron-based superconductors | Angle-resolved photoemission spectroscopy (ARPES) has played an important
role in determining the band structure and the superconducting gap structure of
iron-based superconductors. Here from the ARPES perspective, we briefly review
the main results from our group in the recent years on the iron-based
superconductors a... | 1307.5754v3 |
2014-07-01 | Explaining Mercury's Density through Magnetic Erosion | In protoplanetary disks, dust grains rich in metallic iron can attract each
other magnetically. If they are magnetized to values near saturation, the
magnetically induced collision speeds are high enough to knock off the
non-magnetized, loosely bound silicates. This process enriches the surviving
portions of the dust g... | 1407.0274v1 |
2015-05-22 | Oxygen-annealing effects on superconductivity in polycrystalline Fe1-xTe1-ySey | Superconductivity in anti-PbO-type iron chalcogenides Fe1-xTe1-ySey (x = 0,
0.1, y = 0.1 0.4) depends on the amount (x) of interstitial iron atoms located
between the FeTe1-ySey layers. Non-superconducting samples of nominal
Fe1.1Te1-ySey convert to superconductors with critical temperatures up to 14 K
after annealing ... | 1505.06066v1 |
2015-10-06 | Iron emission line from the spiral galaxy M101 | Archival Suzaku data of the face-on spiral galaxy M101 were analyzed. An
intense emission line at 6.72^{+0.10}_{-0.12} keV was detected in the central
region. This line is identified with a K-line from He-like iron, which
indicates the existence of a thin thermal plasma with a temperature of several
keV. The iron line ... | 1510.01483v1 |
2015-10-29 | Effect of antimony substitution in iron pnictide compounds | In the present study we have examined the effect of negative chemical
pressure in iron pnictides. We have synthesized substitution series replacing
arsenic by antimony in a number of 1111- and 122-iron arsenides and present
their crystallographic and physical properties. The SDW transition temperature
in LaFeAs$_{\math... | 1510.08665v1 |
2015-12-03 | Non-LTE iron abundances in cool stars: The role of hydrogen collisions | In the aim of determining accurate iron abundances in stars, this work is
meant to empirically calibrate H-collision cross-sections with iron, where no
quantum mechanical calculations have been published yet. Thus, a new iron model
atom has been developed, which includes hydrogen collisions for excitation,
ionization a... | 1512.01118v1 |
2016-09-14 | Iron Isotope Effect in SmFeAsO0.65 and SmFeAsO0.77H0.12 Superconductors: A Raman Study | We report the inelastic light scattering studies on SmFeAsO0.65 and
SmFeAsO0.77H0.12 with iron isotopes namely 54Fe and 57Fe. In both of these
systems under investigation we observed a significant shift in the frequency of
the phonon modes associated with the displacement of Fe atoms around ~ 200
cm-1. The observed shi... | 1609.04183v1 |
2017-03-31 | Longitudinal modes of spin fluctuations in iron-based superconductors | Iron-based superconductors can exhibit different magnetic ground states and
are in a critical magnetic region where frustrated magnetic interactions
strongly compete with each other. Here we investigate the longitudinal modes of
spin fluctuations in an unified effective magnetic model for iron-based
superconductors. We... | 1703.10721v2 |
2018-01-10 | The IRON Project: Photoionization of Fe ions | The IRON Project, initiated in 1991, aims at two main objectives, i) study
the characteristics of and calculate large-scale high accuracy data for atomic
radiative and collisional processes, and ii) application in solving
astrophysical problems. It focuses on the complex iron and iron-peak elements
commonly observed in... | 1801.05410v1 |
2018-06-08 | Helium-iron compounds at terapascal pressures | We investigate the binary phase diagram of helium and iron using
first-principles calculations. We find that helium, which is a noble gas and
inert at ambient conditions, forms stable crystalline compounds with iron at
terapascal pressures. A FeHe compound becomes stable above 4 TPa, and a
FeHe$_2$ compound above 12 TP... | 1806.03017v1 |
2018-11-09 | Topological quantum states of matter in iron-based superconductors: From concepts to material realization | We review recent progress in the explorations of topological quantum states
of matter in iron-based superconductors. In particular, we focus on the
nontrivial topology existing in the band structures and superconducting states
of iron's 3d orbitals. The basic concepts, models, materials and experimental
results are rev... | 1811.03802v1 |
2019-02-24 | Spin interactions and magnetic order in the iron oxychalcogenides BaFe2Q2O | The ability to tune the iron chalcogenides BaFe2Q3 from Mott insulators, to
metals and then superconductors with applied pressure has renewed interest in
low-dimensional iron chalcogenides and oxychalcogenides. We report here a
combined experimental and theoretical study on the iron oxychalcogenides
BaFe2Q2O (Q=S, Se) ... | 1902.09035v2 |
2021-11-04 | Sequence of superconducting states in field cooled $FeCr_2S_4$ | In the present article we discuss theoretically the emergence of
superconductivity in field cooled $FeCr_2S_4$. The chromium electrons form a
triplet $t_{2g}$ states and due to antiferromagnetic exchange with the iron
spins have Zeeman splitting. Applied, during preparation, magnetic field along
the moment of iron ions... | 2111.02765v1 |
2023-07-03 | Cosmic abundance of iron | I explore a possibility to estimate an upper limit of the current iron
abundance of the barion matter. The upper limit is determined by the minimal
iron abundance, at which the gamma-ray background, produced by the decay of
$^{56}$Ni synthesised in the Universe to date, contradicts the observational
MeV gamma-ray backg... | 2307.00944v1 |
2014-08-19 | Soft chemical control of superconductivity in lithium iron selenide hydroxides Li1-xFex(OH)Fe1-ySe | Hydrothermal synthesis is described of layered lithium iron selenide
hydroxides Li1-xFex(OH)Fe1-ySe (x ~ 0.2; 0.02 < y < 0.15) with a wide range of
iron site vacancy concentrations in the iron selenide layers. This iron vacancy
concentration is revealed as the only significant compositional variable and as
the key para... | 1408.4350v2 |
1997-02-04 | Roles of SNIa and SNII in ICM Enrichment | Based on ASCA observations Mushotzky et al. (1996, ApJ 466, 686) have
recently derived the relative-abundance ratios of $\alpha$-elements to iron,
[\alpha/Fe] \simeq 0.2-0.3$, for four rich clusters, and have suggested that
the origin of metals in an intra-cluster medium (ICM) is not a type-Ia
supernovae (SNIa), but a ... | 9702036v1 |
2008-08-09 | Iron Behaving Badly: Inappropriate Iron Chelation as a Major Contributor to the Aetiology of Vascular and Other Progressive Inflammatory and Degenerative Diseases | The production of peroxide and superoxide is an inevitable consequence of
aerobic metabolism, and while these particular "reactive oxygen species" (ROSs)
can exhibit a number of biological effects, they are not of themselves
excessively reactive and thus they are not especially damaging at physiological
concentrations.... | 0808.1371v1 |
2008-11-24 | The optical/X-ray connection: ICM iron content and galaxy optical luminosity in 20 galaxy clusters | X-ray observations of galaxy clusters have shown that the intra-cluster gas
has iron abundances of about one third of the solar value. These observations
also show that part (if not all) of the intra-cluster gas metals were produced
within the member galaxies. We present a systematic analysis of 20 galaxy
clusters to e... | 0811.3936v1 |
2009-10-25 | Pair-breaking in iron-pnictides | The puzzling features of the slopes of the upper critical field at the
critical temperature $T_c$, $H^\prime_{c2}(T_c)\propto T_c$, and of the
specific heat jump $\Delta C\propto T_c^3$ of iron-pnictides are interpreted as
caused by a strong pair-breaking. | 0910.4728v1 |
2009-12-28 | Iron pnictide superconductors: Electrons on the verge | An optical analysis reveals that the electronic correlations in the `parent'
compounds of the iron pnictide superconductors are sufficiently strong to
significantly impede the mobility of the electrons. | 0912.4989v1 |
2010-05-19 | Rusty old stars: a source of the missing interstellar iron? | Iron, the Universe's most abundant refractory element, is highly depleted in
both circumstellar and interstellar environments, meaning it exists in solid
form. The nature of this solid is unknown. In this Letter, we provide evidence
that metallic iron grains are present around oxygen-rich AGB stars, where it is
observa... | 1005.3489v1 |
2010-10-14 | Bipolaron Model of the Superconductivity of an Iron-Based Layered Compound LnO_{1-x}F_xFePn (Ln =La, Sm, Nd, Pr, Ce, Pn=P, As) | A bipolaron model is proposed as a superconductivity mechanism for iron-based
superconductivity. The results are consistent with the experiments. | 1010.3026v1 |
2012-02-19 | Spin fluctuations and superconductivity in powders of Fe_1+xTe_0.7Se_0.3 as a function of interstitial iron concentration | Using neutron inelastic scattering, we investigate the role of interstitial
iron on the low-energy spin fluctuations in powder samples of
Fe_{1+x}Te_{0.7}Se_{0.3}. We demonstrate how combining the principle of
detailed balance along with measurements at several temperatures allows us to
subtract both temperature-indepe... | 1202.4152v1 |
2016-05-06 | Iron: A Key Element for Understanding the Origin and Evolution of Interstellar Dust | The origin and depletion of iron differ from all other abundant refractory
elements that make up the composition of the interstellar dust. Iron is
primarily synthesized in Type Ia supernovae (SNe Ia) and in core collapse
supernovae (CCSN), and is present in the outflows from AGB stars. Only the
latter two are observed ... | 1605.01957v1 |
2018-06-25 | Fermi surface pockets in electron-doped iron superconductor by Lifshitz transition | The Fermi surface pockets that lie at the corner of the two-iron Brillouin
zone in heavily electron-doped iron selenide superconductors are accounted for
by an extended Hubbard model over the square lattice of iron atoms that
includes the principal 3d xz and 3d yz orbitals. At half filling, and in the
absence of intra-... | 1806.09322v2 |
2021-10-22 | Thermal conductivity of oxide scale and its components in the range from 0 C to 1300 C: Generalized estimates with account for movability of phase transitions | The data of different authors on the thermal conductivity of wustite Fe1-xO,
magnetite F3O4, hematite Fe2O3 and pure iron are systematized. The generalized
values are described by piecewise smooth functions containing as varying
parameters the temperatures of magnetiv and polymorphic (for iron)
transformations as well ... | 2110.11632v1 |
2021-10-28 | A Quantitative Analysis of the Ignition Characteristics of Fine Iron Particles | Ignition of iron particles in an oxidizing environment marks the onset of a
self-sustained combustion. The objective of the current study is to
quantitatively examine the ignition characteristics of fine iron particles
governed by the kinetics of solid-phase iron oxidation. The oxidation rates are
inversely proportiona... | 2110.15461v2 |
1996-08-23 | NMR in copper-Oxide Metals | The anomalous part of the NMR relaxation rate of coppernuclei in the normal
state of copper-oxide metals is calculated using the orbital magnetic parts of
the fluctuations derived in a recent theory to explain the long wavelength
transport anomalies. Oxygen and Yttrium reside on lattice sites at which the
anomalous con... | 9608109v1 |
1996-12-09 | From microscopic description to statistical mechanics of Cu-O chain fragments in the high-Tc superconductors REBa_2Cu_3O_{6+x} | The oxygen deficient CuO_x planes of the high-Tc superconductors
REBa_2Cu_3O_{6+x} (RE denotes a rare-earth atom or yttrium) are studied.
Starting from the Emery model for the Cu-O chain fragments, an extended ASYNNNI
model is proposed to describe the statistical mechanics of the CuO_x planes.
The model is analysed by ... | 9612072v1 |
1998-09-03 | Fermi Surface as the Driving Mechanism for Helical Antiferromagnetic Ordering in Gd-Y Alloys | The first direct experimental evidence for the Fermi surface (FS) driving the
helical antiferromagnetic ordering in a gadolinium-yttrium alloy is reported.
The presence of a FS sheet capable of nesting is revealed, and the nesting
vector associated with the sheet is found to be in excellent agreement with the
periodici... | 9809063v1 |
1999-03-04 | Parameter-free expression for superconducting Tc in cuprates | A parameter-free expression for the superconducting critical temperature of
layered cuprates is derived which allows us to express Tc in terms of
experimentally measured parameters. It yields Tc values observed in about 30
lanthanum, yttrium and mercury-based samples for different levels of doping.
This remarkable agre... | 9903071v1 |
1999-06-11 | Induced spin polarisation in a ferromagnetic gadolinium-yttrium alloy | The first direct evidence of an induced spin moment in Gd(62.4)Y(37.6) is
presented. This additional moment, of 0.16 +/- 0.03 Bohr magnetons, arises from
polarisation of Y electrons in the alloy. The moment was detected in a Compton
scattering experiment via the measurement of the one dimensional projection of
the mome... | 9906171v1 |
2001-06-18 | Disorder induced hexagonal-orthorhombic transition in (Y,Gd)MnO3 | We show that the transition in AMnO3 from the orthorhombic perovskite phase
to the hexagonal phase is promoted by inducing disorder on the A-site. The gap
between the orthorhombic and the hexagonal phase is widened for disordered,
mixed yttrium-gadolinium manganite samples. At the cost of the orthorhombic
phase a two p... | 0106335v1 |
2002-02-09 | Fermi surface of yttrium | Electron-positron momentum densities in Y, reconstructed from two-dimensional
angular correlation of annihilation radiation spectra, are compared with the
theoretical predictions of fully-relativistic augmented plane-wave
calculations. Knowledge of the theoretical densities and of the effects on them
of certain symmetr... | 0202157v2 |
2002-07-29 | Electronic Structure of the YH3 Phase from Angle-Resolved Photoemission Spectroscopy | Yttrium can be loaded with hydrogen up to high concentrations causing
dramatic structural and electronic changes of the host lattice. We report on
angle-resolved photoemission experiments of the Y trihydride phase. Most
importantly, we find the absence of metal d-bands at the Fermi level and a set
of flat, H-induced ba... | 0207680v1 |
2002-09-10 | On the reliability of various enhancement theories for a description of electron-positron densities in metals | Four theoretical approaches to calculate momentum densities of
electron-positron annihilation pairs (MDAP) in crystalline solids are
confronted with 3D densities reconstructed from two-dimensional angular
correlation (2D-ACAR) data for copper, chromium, and yttrium. It is shown that
the Bloch-modified ladder theory, in... | 0209235v1 |
2004-01-28 | Effects of Substituting Calcium for Yttrium on the Superconducting Properties of YBa2Cu3Oz Bulk Samples | We report systematic studies of AC magnetic susceptibility and transport
properties of Y(1-x)Ca(x)Ba2Cu3Oz bulk samples with 0\leq x\leq 0.4. Single
phase materials, reduction of carrier concentration and decrease of Tc to 85 K
were obtained at doping levels up to 20%. For Y0.7Ca0.3Ba2Cu3Oz sample the
improvement of gr... | 0401584v1 |
2011-11-10 | High-Temperature Superconductivity Mechanism for Cuprates | Egorov and March plotted the product of resistivity and the copper
spin-lattice relaxation time vs. temperature for yttrium barium copper oxide
finding a minimum at temperature T greater than the superconducting
temperature, heralding an electronic phase change which can be interpreted as
the formation of a "preformed"... | 1111.2560v1 |
2013-09-04 | Unexpected colloid-like supernatant from liquid-phase ball-milling graphite using miscible solutions as solvents: a failure analysis | Ball-milling graphite was conducted in miscible solutions with the purpose to
exfoliate graphene. Colloid-like stable supernatants were unexpectedly
obtained. Followed were the characterizations with Scanning electronic
microscopy, Thermogravimetric analysis, X-ray diffraction and Elemental
dispersive X-ray mapping to ... | 1309.1056v2 |
2014-11-25 | Simulation study of negative thermal expansion in yttrium tungstate Y2W3O12 | A simulation study of negative thermal expansion in Y2W3O12 was carried out
using calculations of phonon dispersion curves through the application of
density functional perturbation theory. The mode eigenvectors were mapped onto
flexibility models and results compared with calculations of the mode Gruneisen
parameters.... | 1411.7071v1 |
2015-11-21 | Theoretical description of slow non-monotonic relaxation processes in Al-Y melts | The slow non-monotonic relaxation processes, which have been recently fixed
in Al-Y melts, are described theoretically. The theoretical description is
based on the Cahn-Hilliard theory and functional methods of non-equilibrium
dynamics. In terms of the suggested approach the reasons of this relaxation
kinetics are non-... | 1511.06908v1 |
2016-11-17 | Thin Film growth of Solid State materials | Magnetron sputtering has also been used to deposit thin films of some
materials and it has significant technological importance. A modeling on
deposition of epitaxial thin films of Yttrium Stabilized Zirconia (YSZ) was
done the diffusion of adatom on the surface were studies. There exists a strong
interaction of ions f... | 1611.07926v1 |
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