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2015-03-19 | Bit Patterned Magnetic Recording: Theory, Media Fabrication, and Recording Performance | Bit Patterned Media (BPM) for magnetic recording provide a route to densities
$>1 Tb/in^2$ and circumvents many of the challenges associated with
conventional granular media technology. Instead of recording a bit on an
ensemble of random grains, BPM uses an array of lithographically defined
isolated magnetic islands, e... | 1503.06664v1 |
2019-02-26 | The Evidence of Cathodic Micro-discharges during Plasma Electrolytic Oxidation Process | Plasma electrolytic oxidation (PEO) processing of EV 31 magnesium alloy has
been carried out in fluoride containing electrolyte under bipolar pulse current
regime. Unusual PEO cathodic micro-discharges have been observed and
investigated. It is shown that the cathodic micro-discharges exhibit a
collective intermittent ... | 1902.09828v1 |
2004-10-08 | Total Mass of Ordinary Chondrite Matter Originally Present in the Solar System | Recently, I reported the discovery of a new fundamental relationship of the
major elements (Fe, Mg, Si) of chondrites that admits the possibility that
ordinary chondrite meteorites are derived from two components, a relatively
oxidized and undifferentiated, primitive component and a somewhat
differentiated, planetary c... | 0410242v1 |
2006-02-10 | Solar System Processes Underlying Planetary Formation, Geodynamics, and the Georeactor | Only three processes, operant during the formation of the Solar System, are
responsible for the diversity of matter in the Solar System and are directly
responsible for planetary internal-structures, including planetocentric nuclear
fission reactors, and for dynamical processes, including and especially,
geodynamics. T... | 0602232v2 |
2006-12-01 | Analytical scanning and transmission electron microscopy of laboratory impacts on Stardust aluminum foils: interpreting impact crater morphology and the composition of impact residues | The known encounter velocity (6.1kms-1) and particle incidence angle
(perpendicular) between the Stardust spacecraft and the dust emanating from the
nucleus of comet Wild 2 fall within a range that allows simulation in
laboratory light gas gun experiments designed to validate analytical methods
for the interpretation o... | 0612013v1 |
1994-05-17 | Chemical Reactions of Silicon Clusters | Smalley and co-workers discovered that chemisorption reactivities of silicon
clusters vary over three orders of magnitude as a function of cluster size. In
particular, they found that \Si{33}, \Si{39}, and \Si{45} clusters are least
reactive towards various reagents compared to their immediate neighbors in
size. We exp... | 9405001v1 |
1994-01-07 | Local Disorder in the Oxygen Environment Around Praseodymium in YBCO:Pr from X-ray Absorption Fine Structure | We present K-edge XAFS (X-Ray Absorption Fine Structure) data for various
concentrations of Pr in Y$_{1- x}$Pr$_{x}$Ba$_{2}$Cu$_{3}$O$_{7}$. The
character of the Pr K-edge XAFS data indicate that most of the Pr substitutes
onto the Y site and is well ordered with respect to the unit cell. These data
also show that the ... | 9401014v1 |
1995-02-06 | An Enhanced Perturbational Study on Spectral Properties of the Anderson Model | The infinite-$U$ single impurity Anderson model for rare earth alloys is
examined with a new set of self-consistent coupled integral equations, which
can be embedded in the large $N$ expansion scheme ($N$ is the local spin
degeneracy). The finite temperature impurity density of states (DOS) and the
spin-fluctuation spe... | 9502020v1 |
1995-10-06 | Universality class of non-Fermi liquid behavior in mixed valence systems | A generalized Anderson single-impurity model with off-site Coulomb
interactions is derived from the extended three-band Hubbard model, originally
proposed to describe the physics of the copper-oxides. Using the abelian
bosonization technique and canonical transformations, an effective Hamiltonian
is derived in the stro... | 9510031v2 |
1997-10-17 | The Role of Density of States Fluctuations in the Normal State Properties of High Tc Superconductors | HTS show many puzzling anomalies in their normal state properties. Among them
are:
- the presence of a peak in the c-axis resistance and its growth in external
magnetic field
- the anomalous negative magnetoresistance observed above Tc
- the deviation from the Korringa law in the temperature dependence of the
NMR... | 9710175v2 |
1997-11-18 | Effects of anharmonic strain on phase stability of epitaxial films and superlattices: applications to noble metals | Epitaxial strain energies of epitaxial films and bulk superlattices are
studied via first-principles total energy calculations using the local-density
approximation. Anharmonic effects due to large lattice mismatch, beyond the
reach of the harmonic elasticity theory, are found to be very important in
Cu/Au (lattice mis... | 9711183v1 |
1997-12-12 | Giant Thermomechanical Effect in Normal Liquid He-3 | Measurements are presented of the thermomechanical coefficient of normal
liquid He-3 confined in a porous plug pre-plated with four monoloyers of He-4.
These non-magnetic monolayers displace the magnetic solid-like He-3 monolayers
that are adjacent to the pore surfaces when the plug is filled with pure He-3.
In the low... | 9712144v1 |
1998-01-09 | Evaluating and improving the cluster variation method entropy functional for Ising alloys | The success of the "Cluster Variation Method" (CVM) in reproducing quite
accurately the free energies of Monte Carlo (MC) calculations on Ising models
is explained in terms of identifying a cancellation of errors: We show that the
CVM produces correlation functions that are too close to zero, which leads to
an overesti... | 9801080v1 |
1998-03-18 | Mean-Field Study of the Degenerate Blume-Emery-Griffiths Model in a Random Crystal Field | The degenerate Blume-Emery-Griffiths (DBEG) model has recently been
introduced in the study of martensitic transformation problems. This model has
the same Hamiltonian as the standard Blume-Emery-Griffiths (BEG) model but, to
take into account vibrational effects on the martensitic transition, it is
assumed that the st... | 9803220v1 |
1998-03-20 | Dynamics of a ferromagnetic domain wall: avalanches, depinning transition and the Barkhausen effect | We study the dynamics of a ferromagnetic domain wall driven by an external
magnetic field through a disordered medium. The avalanche-like motion of the
domain walls between pinned configurations produces a noise known as the
Barkhausen effect. We discuss experimental results on soft ferromagnetic
materials, with refere... | 9803253v1 |
1998-10-27 | Fermionic Ising Glasses with BCS Pairing Interaction. Tricritical Behaviour | We have examined the role of the BCS pairing mechanism in the formation of
the magnetic moment and henceforth a spin glass (SG) phase by studying a
fermionic Sherrington-Kirkpatrick model with a local BCS coupling between the
fermions. This model is obtained by using perturbation theory to trace out the
conduction elec... | 9810366v1 |
1998-11-30 | Landau theory of bi-criticality in a random quantum rotor system | We consider here a generalization of the random quantum rotor model in which
each rotor is characterized by an M-component vector spin. We focus entirely on
the case not considered previously, namely when the distribution of exchange
interactions has non-zero mean. Inclusion of non-zero mean permits
ferromagnetic and s... | 9811418v1 |
1998-12-07 | The metal-insulator transition in amorphous Si_{1-x}Ni_x: Evidence for Mott's minimum metallic conductivity | We study the metal-insulator transition in two sets of amorphous Si_{1-x}Ni_x
films. The sets were prepared by different, electron-beam-evaporation-based
technologies: evaporation of the alloy, and gradient deposition from separate
Ni and Si crucibles. The characterization included electron and scanning
tunneling micro... | 9812106v3 |
1999-01-28 | An Efficient Molecular Dynamics Scheme for Predicting Dopant Implant Profiles in Semiconductors | We present a highly efficient molecular dynamics scheme for calculating the
concentration profile of dopants implanted in group-IV alloy, and III-V zinc
blende structure materials. Our program incorporates methods for reducing
computational overhead, plus a rare event algorithm to give statistical
accuracy over several... | 9901338v1 |
1999-03-22 | Superconductivity in heavy-fermion U(Pt,Pd)3 and its interplay with magnetism | The effect of Pd doping on the superconducting phase diagram of the
unconventional superconductor UPt3 has been measured by (magneto)resistance,
specific heat, thermal expansion and magnetostriction. Experiments on single-
and polycrystalline U(Pt1-xPdx)3 for x<= 0.006 show that the superconducting
transition temperatu... | 9903333v1 |
1999-06-15 | Electronic Structure of Cu_(1-x)Ni_xRh_2S_4 and CuRh_2Se_4: Band Structure Calculations, X-ray Photoemission and Fluorescence Measurements | The electronic structure of spinel-type Cu_(1-x)Ni_xRh_2S_4 (x = 0.0, 0.1,
0.3, 0.5, 1.0) and CuRh_2Se_4 compounds has been studied by means of X-ray
photoelectron and fluorescent spectroscopy. Cu L_3, Ni L_3, S L_(2,3) and Se
M_(2,3) X-ray emission spectra (XES) were measured near thresholds at Beamline
8.0 of the Law... | 9906209v1 |
1999-12-02 | Magnetic history dependence of metastable states in systems with dipolar interactions | We present the results of a Monte Carlo simulation of the ground state and
magnetic relaxation of a model of a thin film consisting on a two-dimensional
square lattice of Heisenberg spins with perpendicular anisotropy K, exchange J
and long-range dipolar interactions g. We have studied the ground state
configurations o... | 9912025v2 |
1999-12-28 | Effects of microscopic strain distribution on Ga(1-x)In(x)As quantum wires grown by strain-induced lateral ordering | Band Structures and optical matrix elements of quantum wires(QWR's) made of
short-period superlattices(SPS) with strain-induced lateral ordering(SILO) are
investigated theoretically via an effective bond-orbital model(EBOM) combined
with a valence-force field(VFF) model. Valence-band anistropy, band mixing, and
effects... | 9912468v3 |
2000-03-02 | Kinetics of Ordering in Fluctuation-Driven First-Order Transitions: Simulations and Dynamical Renormalization | Many systems where interactions compete with each other or with constraints
are well described by a model first introduced by Brazovskii. Such systems
include block copolymers, alloys with modulated phases, Rayleigh-Benard Cells
and type-I superconductors. The hallmark of this model is that the fluctuation
spectrum is ... | 0003026v1 |
2000-08-03 | Enhancement of Kondo Temperature in Nanometer-Size Point Contacts | Point-contact spectroscopy is applied to study the energy dependence of
paramagnetic impurities in noble metals. The samples are in the form of the
so-called "mechanically controllable break-junctions" where the investigated
piece of alloy makes a nanowire connecting two bulk electrodes.The lateral
dimensions of the br... | 0008055v1 |
2000-08-17 | Statics and dynamics of domain patterns in hexagonal-orthorhombic ferroelastics | We study the statics and the dynamics of domain patterns in proper
hexagonal-orthorhombic ferroelastics; these patterns are of particular interest
because they provide a rare physical realization of disclinations in crystals.
Both our static and dynamical theories are based entirely on classical,
nonlinear elasticity t... | 0008256v1 |
2000-08-17 | Fermionic Heisenberg Model for Spin Glasses with BCS Pairing Interaction | In the present paper we have analysed a fermionic infinite-ranged quantum
Heisenberg spin glass (s=1/2) with a BCS coupling in real space in the presence
of an applied magnetic field. This model has been obtained by tracing out the
conducting fermions in a superconducting alloy. The magnetic field is applied
in the res... | 0008257v1 |
2000-10-03 | Parquet approach to nonlocal vertex functions and electrical conductivity of disordered electrons | A diagrammatic technique for two-particle vertex functions is used to
describe systematically the influence of spatial quantum coherence and
backscattering effects on transport properties of noninteracting electrons in a
random potential. In analogy with many-body theory we construct parquet
equations for topologically... | 0010044v1 |
2000-11-19 | The relationship between fragility, configurational entropy and the potential energy landscape of glass forming liquids | Glass is a microscopically disordered, solid form of matter that results when
a fluid is cooled or compressed in such a fashion that it does not crystallise.
Almost all types of materials are capable of glass formation -- polymers, metal
alloys, and molten salts, to name a few. Given such diversity, organising
principl... | 0011317v2 |
2001-09-05 | Niobium based intermetallics as a source of high-current/high-magnetic field superconductors | The article is focused on low temperature intermetallic A15 superconducting
wires development for Nuclear Magnetic Resonance, NMR, and Nuclear Magnetic
Imaging, MRI, magnets and also on cryogen-free magnets. There are many other
applications which would benefit from new development such as future Large
Hadron Collider ... | 0109088v1 |
2001-10-09 | Thermoelectric power of Cerium and Ytterbium intermetallics | Temperature dependence S(T) of the thermoelectric power of metallic systems
with cerium and ytterbium ions exhibits some characteristic features, which can
be used to classify these systems into distinct categories. The experimental
data are explained by the Kondo scattering in the presence of the crystal field
splitti... | 0110179v1 |
2001-11-06 | Spin-dependent electrical transport in ion-beam sputter deposited Fe-Cr multilayers | The temperature dependence of the electrical resistivity and
magnetoresistance of Xe-ion beam sputtered Fe-Cr multilayers has been
investigated. The electrical resistivity between 5 and 300 K in the fully
ferromagnetic state, obtained by applying a field beyond the saturation field
(H_sat) necessary for the antiferroma... | 0111084v1 |
2002-01-28 | Automating First-Principles Phase Diagram Calculations | Devising a computational tool that assesses the thermodynamic stability of
materials is among the most important steps required to build a ``virtual
laboratory'', where materials could be designed from first-principles without
relying on experimental input. Although the formalism that allows the
calculation of solid st... | 0201511v2 |
2002-06-19 | Atomic Transport in Dense, Multi-Component Metallic Liquids | Pd43Ni10Cu27P0 has been investigated in its equilibrium liquid state with
incoherent, inelastic neutron scattering. As compared to simple liquids, liquid
PdNiCuP is characterized by a dense packing with a packing fraction above 0.5.
The intermediate scattering function exhibits a fast relaxation process that
precedes s... | 0206364v2 |
2002-08-22 | A nonplanar Peierls-Nabarro model and its applications to dislocation cross-slip | A novel semidiscrete Peierls-Nabarro model is introduced which can be used to
study dislocation spreading at more than one slip planes, such as dislocation
cross-slip and junctions. The strength of the model, when combined with ab
initio calculations for the energetics, is that it produces essentiallyan
atomistic simul... | 0208440v1 |
2002-09-19 | Magnetic Interactions and Transport in (Ga,Cr)As | The magnetic, transport, and structural properties of (Ga,Cr)As are reported.
Zincblende Ga$_{1-x}$Cr$_{x}$As was grown by low-temperature molecular beam
epitaxy (MBE). At low concentrations, x$\sim$0.1, the materials exhibit unusual
magnetic properties associated with the random magnetism of the alloy. At low
temperat... | 0209477v2 |
2002-09-26 | Lattice dynamics and correlated atomic motion from the atomic pair distribution function | The mean-square relative displacements (MSRD) of atomic pair motions in
crystals are studied as a function of pair distance and temperature using the
atomic pair distribution function (PDF). The effects of the lattice vibrations
on the PDF peak widths are modelled using both a multi-parameter Born
von-Karman (BvK) forc... | 0209603v1 |
2003-04-02 | Magnetic ordering of Mn sublattice, dense Kondo lattice behavior of Ce in (RPd3)8Mn (R = La, Ce) | We have synthesized two new interstitial compounds (RPd3)8Mn (R = La and Ce).
The Mn ions present in "dilute" concentration of just 3 molar percent form a
sublattice with an unusually large Mn-Mn near neighbor distance of ~ 85 nm.
While the existence of (RPd3)8M (where M is a p-block element) is already
documented in t... | 0304038v1 |
2003-04-18 | Electronic States and Cyclotron Resonance in n-type InMnAs | We present a theory for electronic and magneto-optical properties of n-type
In(1-x)Mn(x)As magnetic alloy semiconductors in a high magnetic field, B. We
use an 8-band Pidgeon-Brown model generalized to include the wavevector (Kz)
dependence of the electronic states as well as s-d and p-d exchange
interactions with loca... | 0304434v3 |
2003-06-17 | An improved continuous compositional-spread technique based on pulsed-laser deposition and applicable to large substrate areas | A new method for continuous compositional-spread (CCS) thin-film fabrication
based on pulsed-laser deposition (PLD) is introduced. This approach is based on
a translation of the substrate heater and the synchronized firing of the
excimer laser, with the deposition occurring through a slit-shaped aperture.
Alloying is a... | 0306452v1 |
2003-06-25 | Low temperature magnetic phase diagram of the cubic non-Fermi liquid system CeIn_(3-x)Sn_x | In this paper we report a comprehensive study of the magnetic susceptibility
(\chi), resistivity (\rho), and specific heat (C_P), down to 0.5 K of the cubic
CeIn_(3-x)Sn_x alloy. The ground state of this system evolves from
antiferromagnetic (AF) in CeIn_3(T_N=10.2 K) to intermediate-valent in CeSn_3,
and represents th... | 0306658v2 |
2003-07-09 | Fermionic Ising glasses with BCS pairing interaction in the presence of a transverse field | In the present work we have analyzed a fermionic infinite-ranged Ising spin
glass with a local BCS coupling in the presence of transverse field. This model
has been obtained by tracing out the conduction electrons degrees of freedom in
a superconducting alloy. The transverse field \Gamma is applied in the
resulting eff... | 0307210v1 |
2003-10-06 | Linear morphological stability analysis of the solid-liquid interface in rapid solidification of a binary system | The interface stability against small perturbations of the planar
solid-liquid interface is considered analytically in linear approximation.
Following the analytical procedure of Trivedi and Kurz (Trivedi R, Kurz W. Acta
Metall 1986;34:1663), which is advancing the original treatment of
morphological stability by Mulli... | 0310095v1 |
2003-11-02 | Stripe phase: analytical results for weakly coupled repulsive Hubbard model | Motivated by the stripe developments in cuprates, we review some analytical
results of our studies of the charge- and spin density modulations (CDW and
SDW) in a weakly coupled one dimensional repulsive electron system on a
lattice. It is shown that close to half filling, in the high temperature regime
above the mean f... | 0311019v1 |
2003-12-21 | Sharp lines in the absorption edge of EuTe and Pb$_{0.1}$Eu$_{0.9}$Te in high magnetic fields | The optical absorption spectra in the region of the \fd transition energies
of epitaxial layers of of EuTe and \PbEuTe, grown by molecular beam epitaxy,
were studied using circularly polarized light, in the Faraday configuration.
Under \sigmam polarization a sharp symmetric absorption line (full width at
half-maximum 0... | 0312557v4 |
2004-05-26 | The Effects of Phase Separation in the Cuprate Superconductors | Phase separation has been observed by several different experiments and it is
believed to be closely related with the physics of cuprates but its exactly
role is not yet well known. We propose that the onset of pseudogap phenomenon
or the upper pseudogap temperature $T^*$ has its origin in a spontaneous phase
separatio... | 0405612v2 |
2004-06-26 | Microscopic View on Short-Range Wetting at the Free Surface of the Binary Metallic Liquid Gallium-Bismuth: An X-ray Reflectivity and Square Gradient Theory Study | We present an x-ray reflectivity study of wetting at the free surface of the
binary liquid metal gallium-bismuth (Ga-Bi) in the region where the bulk phase
separates into Bi-rich and Ga-rich liquid phases. The measurements reveal the
evolution of the microscopic structure of wetting films of the Bi-rich,
low-surface-te... | 0406661v1 |
2004-10-18 | Modeling and Simulation of Strained Heteroepitaxial Growth | We introduce an off-lattice model with continuous particle distances and
pair-potential interactions which allows for the efficient simulation of
strained heteroepitaxial growth by means of kinetic Monte Carlo (KMC)
simulations. We discuss in detail the application of our model to the
simulation of three important stra... | 0410456v1 |
2004-10-19 | The upper critical field of filamentary Nb3Sn conductors | We have examined the upper critical field of a large and representative set
of present multi-filamentary Nb3Sn wires and one bulk sample over a temperature
range from 1.4 K up to the zero field critical temperature. Since all present
wires use a solid-state diffusion reaction to form the A15 layers,
inhomogeneities wit... | 0410463v2 |
2004-10-22 | Monte Carlo simulation of equilibrium L1_0 ordering in FePt nanoparticles | First, second and third nearest neighbor mixing potentials for FePt alloys,
were calculated from first principles using a Connolly-Williams approach. Using
the mixing potentials obtained in this manner, the dependency of equilibrium
L1_0 ordering on temperature was studied for bulk and for a spherical
nanoparticle with... | 0410590v1 |
2004-12-22 | On the growth and form of spherulites | Many structural materials (metal alloys, polymers, minerals, etc.) are formed
by quenching liquids into crystalline solids. This highly non-equilibrium
process often leads to polycrystalline growth patterns that are broadly termed
"spherulites" because of their large-scale average spherical shape. Despite the
prevalenc... | 0412630v1 |
2005-04-26 | Role of C in MgC_xNi_3 investigated from first principles | The influence of vacancies in the $C$ sub-lattice of $MgCNi_{3}$, on its
structural, electronic and magnetic properties are studied by means of the
density-functional based Korringa-Kohn-Rostoker Green's function method
formulated in the atomic sphere approximation. Disorder is taken into account
by means of coherent-p... | 0504659v2 |
2005-06-09 | Pressure-induced valence change in the rare earth metals:The case of Praseodymium | The rare earth metal praseodymium (Pr) transforms from the d-fcc crystal
structure (Pr-III) to {$\alpha$}-U one (Pr-IV) at 20 GPa with a large volume
collapse (${\rm\Delta} V/V$ = 0.16), which is associated with the valence
change of the Pr ion. The two 4{\it f} electrons in the Pr ion is supposed to
be itinerant in th... | 0506222v1 |
2005-11-03 | Phase transitions in Ni2+xMn1-xGa with a high Ni excess | Ferromagnetic shape memory alloys Ni$_{2+x}$Mn$_{1-x}$Ga were studied in the
range of compositions $0.16 \le x \le 0.36$. Experimental phase diagram,
constructed from differential scanning calorimetry, transport and magnetic
measurements, exhibits distinctive feature in a compositional interval $0.18
\le x \le 0.27$, w... | 0511086v2 |
2005-12-08 | Statistical Theory of Spin Relaxation and Diffusion in Solids | A comprehensive theoretical description is given for the spin relaxation and
diffusion in solids. The formulation is made in a general
statistical-mechanical way. The method of the nonequilibrium statistical
operator (NSO) developed by D. N. Zubarev is employed to analyze a relaxation
dynamics of a spin subsystem. Pert... | 0512182v2 |
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 |
2005-12-29 | Anomalous precursor diamagnetism at low reduced magnetic fields and the role of Tc inhomogeneities in the superconductors Pb55In45 and underdoped La1.9Sr0.1CuO4 | The magnetic field dependence of the magnetization was measured above the
superconducting transition in a high-Tc underdoped cuprate La1.9Sr0.1CuO4 and
in a low-Tc alloy (Pb55In45). Near the superconducting transition [typically
for (T-Tc)/Tc<0.05] and under low applied magnetic field amplitudes [typically
for H/Hc2(0)... | 0512700v2 |
2006-01-05 | Two-dimensional scaling properties of experimental fracture surfaces | The morphology of fracture surfaces encodes the various complex damage and
fracture processes occurring at the microstructure scale that have lead to the
failure of a given heterogeneous material. Understanding how to decipher this
morphology is therefore of fundamental interest. This has been extensively
investigated ... | 0601087v1 |
2006-01-23 | Dielectric Properties of Noncrystalline HfSiON | The dielectric properties of noncrystalline hafnium silicon oxynitride
(HfSiON) films with a variety of atomic compositions were investigated. The
films were deposited by reactive sputtering of Hf and Si in an O, N, and Ar
mixture ambient. The bonding states, band-gap energies, atomic compositions,
and crystallinities ... | 0601503v1 |
2006-04-25 | Thermopower of CexR1-xB6 (R=La, Pr and Nd) | The thermopower, S, of CexR1-xB6 (R=La, Pr, Nd) was investigated. S with a
positive sign shows a typical behavior observed in the Ce Kondo system, an
increase with decreasing temperature at high temperatures and a maximum at low
temperatures. The S values of all the systems at high temperatures are roughly
linearly dep... | 0604582v1 |
2006-06-07 | Ab initio study of the atomic motion in liquid metal surfaces: comparison with Lennard-Jones systems | It is established that liquid metals exhibit surface layering at the
liquid-vapor interface, while dielectric simple systems, like those interacting
through Lennard-Jones potentials, show a monotonic decay from the liquid
density to that of the vapor. First principles molecular dynamics simulations
of the liquid-vapor ... | 0606186v1 |
2006-06-28 | The random-anisotropy model in the strong-anisotropy limit | We investigate the nature of the critical behaviour of the random-anisotropy
Heisenberg model (RAM), which describes a magnetic system with random uniaxial
single-site anisotropy, such as some amorphous alloys of rare earths and
transition metals. In particular, we consider the strong-anisotropy limit
(SRAM), in which ... | 0606728v1 |
2006-08-02 | Magnetocatalytic Adiabatic Spin Torque Orbital Transformations for Novel Chemical and Catalytic Reaction Dynamics: The Little Effect | In this manuscript the theory and phenomena associated with the Little Effect
are introduced as the spin induced orbital dynamics of confined fermions under
strong magnetic and thermal environments. This Little Effect is considered in
details for the electron transfer reactions associated with redox processes of
Cu-Ag ... | 0608071v1 |
2006-11-14 | Topological Insulators with Inversion Symmetry | Topological insulators are materials with a bulk excitation gap generated by
the spin orbit interaction, and which are different from conventional
insulators. This distinction is characterized by Z_2 topological invariants,
which characterize the groundstate. In two dimensions there is a single Z_2
invariant which dist... | 0611341v2 |
2006-12-24 | Carrier induced ferromagnetism in diluted local-moment systems | The electronic and magnetic properties of concentrated and diluted
ferromagnetic semiconductors are investigated by using the Kondo lattice model,
which describes an interband exchange coupling between itinerant conduction
electrons and localized magnetic moments. In our calculations, the electronic
problem and the loc... | 0612611v1 |
2007-03-12 | Molecular Dynamics Simulation of Ga Penetration along Sigma 5 Symmetric Tilt Grain Boundaries in an Al Bicrystal | Liquid metal embrittlement (LME) is a common feature of systems in which a
low melting point liquid metal is in contact with another, higher melting
point, polycrystalline metal. While different systems exhibit different LME
fracture characteristics, the penetration of nanometer-thick liquid metal films
along the grain... | 0703307v1 |
2007-03-20 | Investigation of the chemical vicinity of crystal defects in ion-irradiated Mg and AZ31 with coincident Doppler broadening spectroscopy | Crystal defects in magnesium and magnesium based alloys like AZ31 are of
major importance for the understanding of their macroscopic properties. We have
investigated defects and their chemical surrounding in Mg and AZ31 on an atomic
scale with Doppler broadening spectroscopy of the positron annihilation
radiation. In t... | 0703524v3 |
2005-05-02 | Particle acoustic detection in gravitational wave aluminum resonant antennas | The results on cosmic rays detected by the gravitational antenna NAUTILUS
have motivated an experiment (RAP) based on a suspended cylindrical bar, which
is made of the same aluminum alloy as NAUTILUS and is exposed to a high energy
electron beam. Mechanical vibrations originate from the local thermal expansion
caused b... | 0505009v1 |
2001-05-30 | The absolute continuity of the integrated density of states for magnetic Schrödinger operators with certain unbounded random potentials | The object of the present study is the integrated density of states of a
quantum particle in multi-dimensional Euclidean space which is characterized by
a Schr{\"o}dinger operator with magnetic field and a random potential which may
be unbounded from above and below. In case that the magnetic field is constant
and the ... | 0105046v2 |
1998-09-24 | Oxygen in the Earth's core: a first principles study | First principles electronic structure calculations based on density
functional theory have been used to study the thermodynamic, structural and
transport properties of solid solutions and liquid alloys of iron and oxygen at
Earth's core conditions. Aims of the work are to determine the oxygen
concentration needed to ac... | 9809036v1 |
1999-01-26 | Vibrating Wire for Beam Profile Scanning | The method for measurement of transverse profile (emittance) of the bunch by
detecting of radiation arising scattering at of the bunch on the scanning wire
is wide-spread. In this work the information about scattering bunch is proposed
to measure using the oscillation frequency of the tightened scanning wire. In
such w... | 9901046v1 |
2001-08-12 | DMSO-Induced Dehydration of DPPC Membranes Studied by X-ray Diffraction, Small-Angle Neutron Scattering, and Calorimetry | The influence of dimethyl sulfoxide (DMSO) on membrane thickness,
multilamellar repeat distance, and phase transitions of
1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC) was investigated by
X-ray diffraction and small-angle neutron scattering (SANS). The differential
scanning calorimetry (DSC) study of water fr... | 0108019v1 |
2002-07-30 | Work functions, ionization potentials, and in-between: Scaling relations based on the image charge model | We revisit a model in which the ionization energy of a metal particle is
associated with the work done by the image charge force in moving the electron
from infinity to a small cut-off distance just outside the surface. We show
that this model can be compactly, and productively, employed to study the size
dependence of... | 0207116v2 |
2006-08-02 | Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado-Diamonds | The first complete infrared FTIR absorption spectra for carbonado-diamond
confirm the interstellar origin for the most enigmatic diamonds known as
carbonado. All previous attempts failed to measure the absorption of
carbonado-diamond in the most important IR-range of 1000-1300 cm-1 (10.00-7.69
micro-m.) because of sili... | 0608014v2 |
2007-01-24 | Icosahedral quasicrystals for visible wavelengths by optical interference holography | Quasicrystals, realized in metal alloys, are a class of lattices exhibiting
symmetries that fall outside the usual classification for periodic crystals.
They do not have translational symmetry and yet the lattice points are well
ordered. Furthermore, they exhibit higher rotational symmetry than periodic
crystals. Becau... | 0701276v1 |
1995-06-22 | The Flux-Line Lattice in Superconductors | Magnetic flux can penetrate a type-II superconductor in form of Abrikosov
vortices. These tend to arrange in a triangular flux-line lattice (FLL) which
is more or less perturbed by material inhomogeneities that pin the flux lines,
and in high-$T_c$ supercon- ductors (HTSC's) also by thermal fluctuations. Many
propertie... | 9506003v1 |
2007-05-28 | Muon spin relaxation and hyperfine-enhanced 141Pr nuclear spin dynamic in Pr(Os,Ru)4Sb12 and (Pr,La)Os4Sb12 | Zero- and longitudinal-field muon spin relaxation (MuSR) experiments have
been carried out in the alloy series Pr(Os1-xRux)4Sb12 and Pr1-yLayOs4Sb12 to
elucidate the anomalous dynamic muon spin relaxation observed in these
materials. The damping rate associated with this relaxation varies with
temperature, applied magn... | 0705.4087v1 |
2007-07-19 | Diffusive and ballistic current spin-polarization in magnetron-sputtered L1o-ordered epitaxial FePt | We report on the structural, magnetic, and electron transport properties of a
L1o-ordered epitaxial iron-platinum alloy layer fabricated by
magnetron-sputtering on a MgO(001) substrate. The film studied displayed a long
range chemical order parameter of S~0.90, and hence has a very strong
perpendicular magnetic anisotr... | 0707.2943v1 |
2007-10-18 | Effects of a tungsten addition on the morphological evolution, spatial correlations, and temporal evolution of a model Ni-Al-Cr superalloy | The effect of adding 2 at.% W to a model Ni-Al-Cr superalloy on the
morphological evolution, spatial correlations and temporal evolution of
g'(L12)-precipitates at 1073 K is studied with scanning electron microscopy and
atomic force microscopy. Adding W yields a larger microhardness, earlier onset
of spheroidal-to-cubo... | 0710.3610v1 |
2007-10-22 | Experimental and First principle calculation of Co_xNi_{(1-x)}Si solid solution structural stability | We report the investigation of the structural stability of
Co$_{(1-x)}$Ni$_x$Si monosilicides for $0<x<1$. As CoSi crystallizes in the
FeSi-type structure (B20) and NiSi is stable in the MnP-type structure (B31), a
complete set of samples has been synthesized and a systematic study of phase
formation under different an... | 0710.4012v1 |
2007-11-21 | Au-SN Flip-Chip Solder Bump for Microelectronic and Optoelectronic Applications | As an alternative to the time-consuming solder pre-forms and pastes currently
used, a co-electroplating method of eutectic Au-Sn alloy was used in this
study. Using a co-electroplating process, it was possible to plate the Au-Sn
solder directly onto a wafer at or near the eutectic composition from a single
solution. Tw... | 0711.3323v1 |
2007-12-12 | Nanoscale grains, high irreversibility field, and large critical current density as a function of high energy ball milling time in C-doped magnesium diboride | Magnesium diboride (MgB2) powder was mechanically alloyed by high energy ball
milling with C to a composition of Mg(B0.95C0.05)2 and then sintered at 1000 C
in a hot isostatic press. Milling times varied from 1 minute to 3000 minutes.
Full C incorporation required only 30-60 min of milling. Grain size of sintered
sampl... | 0712.2056v1 |
2008-01-14 | Hydrogen Dissociation and Diffusion on Ni and Ti -doped Mg(0001) Surfaces | It is well known, both theoretically and experimentally, that alloying
MgH$_2$ with transition elements can significantly improve the thermodynamic
and kinetic properties for H$_2$ desorption, as well as the H$_2$ intake by Mg
bulk. Here we present a density functional theory investigation of hydrogen
dissociation and ... | 0801.2107v1 |
2008-01-15 | Half-Metallic L2$_1$ Structures with (001) Planar Insertions | A number of L2$_1$ phase alloys (composition X$_2$YZ) are half-metallic.
Although this structure is typically described in terms of an fcc Bravais
lattice with a 4 atom basis, it can be viewed more simply as a variant of bcc
or B2 in which planes of X$_2$ alternate with planes of YZ along the 001
direction. Using ab-in... | 0801.2363v1 |
2008-02-04 | Self-organized transient facilitated atomic transport in Pt/Al(111) | During the course of atomic transport in a host material, impurity atoms need
to surmount an energy barrier driven by thermodynamic bias or at ultra-low
temperatures by quantum tunneling. In the present article we demonstrate using
atomistic simulations that at ultra-low temperature transient inter-layer
atomic transpo... | 0802.0347v1 |
2008-06-27 | Defect-induced incompatibility of elastic strains: dislocations within the Landau theory of martensitic phase transformations | In dislocation-free martensites the components of the elastic strain tensor
are constrained by the Saint-Venant compatibility condition which guarantees
continuity of the body during external loading. However, in dislocated
materials the plastic part of the distortion tensor introduces a displacement
mismatch that is r... | 0806.4564v2 |
2008-07-15 | Superconductivity in the PbO-type Structure alpha-FeSe | The recent discovery of superconductivity with relatively high transition
temperature Tc in the layered iron-based quaternary oxypnictides La[ O1-xFx]
FeAs was a real surprise. The excitement generated can be seen by the number of
subsequent works published within a very short period of time. Although there
exists supe... | 0807.2369v2 |
2008-08-20 | Crystal Growth and Anisotropic Magnetic Properties of RAg$_2$Ge$_2$ (R = Pr, Nd and Sm) Single Crystals | We report the single crystal growth and anisotropic magnetic properties of
the tetragonal RAg$_2$Ge$_2$ (R = Pr, Nd and Sm) compounds which crystallize in
the ThCr$_2$Si$_2$ type crystal structure with the space group \textit{I4/mmm}.
The single crystals of RAg$_2$Ge$_2$ (R = Pr, Nd and Sm) were grown by
self-flux meth... | 0808.2826v1 |
2008-09-09 | Intermediate Phases, structural variance and network demixing in chalcogenides: the unusual case of group V sulfides | We review Intermediate Phases (IPs) in chalcogenide glasses and provide a
structural interpretation of these phases. In binary group IV selenides, IPs
reside in the 2.40 < r < 2.54 range, and in binary group V selenides they shift
to a lower r, in the 2.29< r < 2.40 range. Here r represents the mean
coordination number... | 0809.1469v2 |
2008-11-03 | Compensation-dependent in-plane magnetization reversal processes in Ga1-xMnxP1-ySy | We report the effect of dilute alloying of the anion sublattice with S on the
in-plane uniaxial magnetic anisotropy and magnetization reversal process in
Ga1-xMnxP as measured by both ferromagnetic resonance (FMR) and superconducting
quantum interference device (SQUID) magnetometry. At T=5K, raising the S
concentration... | 0811.0385v1 |
2008-11-27 | Anomalous binding of Fe atoms in chromium | Binding of 57Fe atoms in a metallic chromium was investigated in a Cr-Fe
alloy, containing less than 0.1 at% Fe enriched to ~95 % in 57Fe isotope, using
57Fe-site Mossbauer spectroscopy. The binding force was derived from the Debye
temperature, T_D, that, in turn, was calculated from the temperature dependence
of the c... | 0811.4533v1 |
2009-03-02 | Ferromagnetic properties of p-(Cd,Mn)Te quantum wells: Interpretation of magneto-optical measurements by Monte Carlo simulations | In order to single out dominant phenomena that account for carrier-controlled
magnetism in p-(Cd,Mn)Te quantum wells we have carried out magneto-optical
measurements and Monte Carlo simulations of time dependent magnetization. The
experimental results show that magnetization relaxation is faster than 20 ns in
the param... | 0903.0406v1 |
2009-06-29 | A novel wear-resistant magnetic thin film material based on a $Ti_{1-x}Fe_xC_{1-y}$ nanocomposite alloy | In this study we report on the film growth and characterization of thin
(approximately 50 nm thick) Ti-Fe-C films deposited on amorphous quartz. The
experimental studies have been complemented by first principles density
functional theory (DFT) calculations. Upon annealing of as-prepared films, the
composition of the m... | 0906.5386v1 |
2009-08-09 | Topological Surface States Protected From Backscattering by Chiral Spin Texture | Topological insulators are a new class of insulators in which a bulk gap for
electronic excitations is generated by strong spin orbit coupling. These novel
materials are distinguished from ordinary insulators by the presence of gapless
metallic boundary states, akin to the chiral edge modes in quantum Hall
systems, but... | 0908.1247v1 |
2009-08-12 | High sensitivity of 17O NMR to p-d hybridization in transition metal perovskites: first principles calculations of large anisotropic chemical shielding | A first principles embedded cluster approach is used to calculate O chemical
shielding tensors, sigma, in prototypical transition metal oxide ABO_3
perovskite crystals. Our principal findings are 1) a large anisotropy of sigma
between deshielded sigma_x ~ sigma_y and shielded sigma_z components (z along
the Ti-O bond);... | 0908.1779v2 |
2009-08-13 | Role of thermal vibrations in phase transitions | All theoretical models (Heisenberg, Ising etc.) assume a negligible role for
thermal vibrations in alloy and magnetic phase transitions. Analysis of
diffraction data conclusively proves that this assumption is incorrect. A
simple criterion emerges that theoretical models can ignore the role of thermal
vibrations only i... | 0908.1873v2 |
2009-09-13 | Unconventional ferromagnetism and transport properties of (In,Mn)Sb dilute magnetic semiconductor | Narrow-gap higher mobility semiconducting alloys In_{1-x}Mn_{x}Sb were
synthesized in polycrystalline form and their magnetic and transport properties
have been investigated. Ferromagnetic response in In_{0.98}Mn_{0.02}Sb was
detected by the observation of clear hysteresis loops up to room temperature in
direct magneti... | 0909.2407v2 |
2009-09-16 | Experimental Evaluation of the Rheological Properties of Veriflex Shape Memory Polymer | Shape memory polymers (SMPs) are materials with a great potential for future
use in smart materials and structures. When heated from cold state (below the
transformation temperature, which can either be the glass transition
temperature or the melting temperature of the polymer) to hot state (above the
transformation te... | 0909.2953v1 |
2009-10-09 | Space efficient opposed-anvil high-pressure cell and its application to optical and NMR measurements up to 9 GPa | We have developed a new type of opposed-anvil high pressure cell with
substantially improved space efficiency. The clamp cell and the gasket are made
of non-magnetic Ni-Cr-Al alloy. Non-magnetic tungsten carbide (NMWC) is used
for the anvils. The assembled cell with the dimension \phi 29mm \times 41mm is
capable of gen... | 0910.1767v2 |
2009-10-23 | Supression of electron correlations in the superconducting alloys of Rh$_{17-x}$Ir$_x$S$_{15}$ | We have studied the effect of Iridium doping (Rh$_{17-x}$Ir$_{x}$S$_{15}$) in
the Rhodium sites of the strongly correlated superconductor Rh$_{17}$S$_{15}$.
Even at low levels of doping (x = 1 and 2) we see a drastic change in the
superconducting properties as compared to those of the undoped system. We
deduce that the... | 0910.4478v2 |
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