publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
|---|---|---|---|
2005-06-17 | Theory of spin-polarized transport in ferromagnet-semiconductor structures: Unified description of ballistic and diffusive transport | A theory of spin-polarized electron transport in ferromagnet-semiconductor
heterostructures, based on a unified semiclassical description of ballistic and
diffusive transport in semiconductors, is outlined. The aim is to provide a
framework for studying the interplay of spin relaxation and transport mechanism
in spintr... | 0506441v1 |
2006-02-06 | Non-collinear Magnetoelectronics | The electron transport properties of hybrid ferromagnetic|normal metal
structures such as multilayers and spin valves depend on the relative
orientation of the magnetization direction of the ferromagnetic elements.
Whereas the contrast in the resistance for parallel and antiparallel
magnetizations, the so-called Giant ... | 0602151v1 |
2006-02-27 | Relating supercooling and glass-like arrest of kinetics for phase separated systems: studies on doped CeFe$_2$ and (La,Pr,Ca)MnO$_3$ | Coexisting ferromagnetic and antiferromagnetic phases over a range of
temperature as well as magnetic field have been reported in many materials of
current interest, showing disorder-broadened 1st order transitions. Anomalous
history effects observed in magnetization and resistivity are being explained
invoking the con... | 0602627v1 |
2006-06-09 | The magnetotransport properties of La0.7Sr0.3MnO3/BaTiO3 superlattices grown by pulsed laser deposition technique | We have investigated the magnetotransport properties of La0.7Sr0.3MnO3/BaTiO3
superlattices, grown on SrTiO3 substrate by pulsed laser deposition technique,
both with current-in-plane and current-perpendicular-to-the-plane directions.
Several features indicate the presence of magnetic inhomogeneities at the
interfaces ... | 0606232v1 |
2006-06-30 | Synthesis of VO_2 Nanowire and Observation of the Metal-Insulator Transition | We have fabricated crystalline nanowires of VO_2 using a new synthetic
method. A nanowire synthesized at 650^oC shows the semiconducting behavior and
a nanowire at 670^oC exhibits the first-order metal-insulator transition which
is not the one-dimensional property. The temperature coefficient of resistance
in the semic... | 0606793v1 |
2006-11-17 | Evolution in Materio: Exploiting the Physics of Materials for Computation | We describe several techniques for using bulk matter for special purpose
computation. In each case it is necessary to use an evolutionary algorithm to
program the substrate on which the computation is to take place. In addition,
the computation comes about as a result of nearest neighbour interactions at
the nano- micr... | 0611462v1 |
2006-12-23 | Magnetic phase diagram of Ce2Fe17 | Rare-earth-based permanent-magnet materials rich in iron have relatively low
ferromagnetic ordering temperatures. This is believed to be due to the presence
of antiferromagnetic exchange interactions, besides the ferromagnetic
interactions responsible for the magnetic order. The magnetic properties of
Ce2Fe17 are anoma... | 0612603v1 |
2006-05-06 | Radiation enhancement and radiation suppression by a left-handed metamaterial | The perfect lens property of a dispersive and lossy left-handed metamaterial
(LHM) disk is exploited to superimpose a source of electromagnetic radiation
onto its mirror image, formed as a result of reflection from a perfect electric
conductor (PEC) or a perfect magnetic conductor (PMC). The superposition of a
vertical... | 0605055v1 |
2006-07-25 | Superconductivity: coherent "tunnelling" by a dielectric array of charge-carriers | Superconduction manifests when a steady-state current flows through a
material without an electric field being present. It is argued here that the
absence of scattering of the charge-carriers, although absolutely necessary, is
not sufficient to explain why an electric field is zero when a current flows
between two cont... | 0607227v1 |
2005-04-05 | Reduction of Magnetic Noise in Atom Chips by Material Optimization | We discuss the contribution of the material type in metal wires to the
electromagnetic fluctuations in magnetic microtraps close to the surface of an
atom chip. We show that significant reduction of the magnetic noise can be
achieved by replacing the pure noble metal wires with their dilute alloys. The
alloy compositio... | 0504027v2 |
2007-04-20 | Transport measurements across a tunable potential barrier in graphene | The peculiar nature of electron scattering in graphene is among many exciting
theoretical predictions for the physical properties of this material. To
investigate electron scattering properties in a graphene plane, we have created
a gate-tunable potential barrier within a single-layer graphene sheet. We
report measurem... | 0704.2626v2 |
2007-05-16 | Ab initio estimate of temperature dependence of electrical conductivity in a model amorphous material: hydrogenated amorphous silicon | We present an ab initio calculation of the DC conductivity of amorphous
silicon and hydrogenated amorphous silicon. The Kubo-Greenwood formula is used
to obtain the DC conductivity, by thermal averaging over extended dynamical
simulation. Its application to disordered solids is discussed. The conductivity
is computed f... | 0705.2384v3 |
2007-07-08 | Tensoresistive Effect in Single Crystal Microwires of Pbte Doped with Tl | Results of room temperature measurements of tensoresistive effect of thin
single crystal microwires of Pb1-xTlxTe (x=0.0000 - 0.0025, d = 5 - 20
micrometers) obtained from the melted compound of corresponding composition by
the filling of quartz capillary with the following crystallization of material
are presented. Fo... | 0707.1124v1 |
2007-08-13 | Orbital Ordering Structures in (Nd,Pr)0.5Sr0.5MnO3 Manganite Thin Films on Perovskite (011) Substrates | Structural study of orbital-ordered manganite thin films has been conducted
using synchrotron radiation, and a ground state electronic phase diagram is
made. The lattice parameters of four manganite thin films, Nd0.5Sr0.5MnO3
(NSMO) or Pr0.5Sr0.5MnO3 (PSMO) on (011) surfaces of SrTiO3 (STO) or
[(LaAlO3){0.3}(SrAl0.5Ta0... | 0708.1693v1 |
2007-08-16 | The nanostructural origin of the ac conductance in dielectric granular metals: the case study of Co_20(ZrO_2)_80 | We show which is the nanostructure required in granular Co20(ZrO2)80 thin
films to produce an ac response such as the one that is universally observed in
a very wide variety of dielectric materials. A bimodal size distribution of Co
particles yields randomly competing conductance channels which allow both
thermally ass... | 0708.2140v1 |
2007-08-16 | Spin-transfer torques in anti-ferromagnetic metals from first principles | In spite of the absence of a macroscopic magnetic moment, an anti-ferromagnet
is spin-polarized on an atomic scale. The electric current passing through a
conducting anti-ferromagnet is polarized as well, leading to spin-transfer
torques when the order parameter is textured, such as in anti-ferromagnetic
non-collinear ... | 0708.2143v2 |
2007-12-11 | Frequency- and electric-field-dependent conductivity of single-walled carbon nanotube networks of varying density | We present measurements of the frequency and electric field dependent
conductivity of single walled carbon nanotube(SWCNT) networks of various
densities. The ac conductivity as a function of frequency is consistent with
the extended pair approximation model and increases with frequency above an
onset frequency $\omega_... | 0712.1733v3 |
2007-12-21 | Kinks in the electronic specific heat | We find that the heat capacity of a strongly correlated metal presents
striking changes with respect to Landau Fermi liquid theory. In contrast with
normal metals, where the electronic specific heat is linear at low temperature
(with a T^3 term as a leading correction), a dynamical mean-field study of the
correlated Hu... | 0712.3723v2 |
2008-01-07 | Utility of transient testing to characterize thermal interface materials | This paper analyzes a transient method for the characterization of
low-resistance thermal interfaces of microelectronic packages. The transient
method can yield additional information about the package not available with
traditional static methods at the cost of greater numerical complexity,
hardware requirements, and ... | 0801.1009v1 |
2008-03-05 | Giant room temperature piezoresistance in a metal/silicon hybrid | Metal/semiconductor hybrids are artificially created structures presenting
novel properties not exhibited by either of the component materials alone. Here
we present a giant piezoresistance effect in a hybrid formed from silicon and
aluminum. The maximum piezoresistive gage factor (GF) of 843, measured at room
temperat... | 0803.0655v1 |
2008-04-02 | Physical properties of the new Uranium ternary compounds U3Bi4M3 (M=Ni, Rh) | We report the properties of two new isostructural compounds, U3Bi4Ni3 and
U3Bi4Rh3. The first of these compounds is non-metallic, and the second is a
nearly ferromagnetic metal, both as anticipated from their electron count
relative to other U-based members of the larger 3-4-3 family. For U3Bi4Rh3, a
logarithmic increa... | 0804.0393v1 |
2008-11-19 | Intrinsic Response of Graphene Vapor Sensors | Graphene is a purely two-dimensional material that has extremely favorable
chemical sensor properties. It is known, however, that conventional
nanolithographic processing typically leaves a resist residue on the graphene
surface, whose impact on the sensor characteristics of the system has not yet
been determined. Here... | 0811.3091v1 |
2009-03-19 | Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting layered pnictide oxide with a thick perovskite oxide layer | A new layered oxypnictide (Fe2P2)(Sr4Sc2O6) have been synthesized by
solid-state reaction. This material has an alternating layer stacking structure
of anti-fluorite Fe2P2 and perovskite-based Sr4Sc2O6 oxide layers. Space group
of the material is P4/nmm and lattice constants a and c are 4.016 A and 15.543
A, respective... | 0903.3314v3 |
2009-05-27 | Precision Cutting and Patterning of Graphene with Helium Ions | We report nanoscale patterning of graphene using a helium ion microscope
configured for lithography. Helium ion lithography is a direct-write
lithography process, comparable to conventional focused ion beam patterning,
with no resist or other material contacting the sample surface. In the present
application, graphene ... | 0905.4407v2 |
2009-06-08 | Tunneling electroresistance effect in ferroelectric tunnel junctions at the nanoscale | Stable and switchable polarization of ferroelectric materials opens a
possibility to electrically control their functional behavior. A particularly
promising approach is to employ ferroelectric tunnel junctions where the
polarization reversal in a ferroelectric barrier changes the tunneling current
across the junction.... | 0906.1521v1 |
2009-06-30 | Electric field effects, Mott insulator, Surface patterning, Scanning tunneling microscopy, Transition metal chalcogenides | We report the first experimental evidence for a strong electromechanical
coupling in the Mott insulator GaTa4Se8 allowing a highly reproducible
nano-writing with a Scanning Tunneling Microscope (STM). The local electric
field across the STM junction is observed to have a threshold value above which
the clean (100) surf... | 0906.5473v1 |
2009-11-30 | Kondo-like behaviors in magnetic and thermal properties of single crystal Tm5Si2Ge2 | We grew the single crystal of stoichiometric Tm5Si2.0Ge2.0 using a Bridgeman
method and performed XRD, EDS, magnetization, ac and dc magnetic
susceptibilities, specific heat, electrical resistivity and XPS experiments. It
crystallizes in orthorhombic Sm5Ge4-type structure. The mean valence of Tm ions
in Tm5Si2.0Ge2.0 i... | 0911.5640v1 |
2009-12-05 | Theory and Simulation of Spin Transport in Antiferromagnetic Semiconductors: Application to MnTe | We study in this paper the parallel spin current in an antiferromagnetic
semiconductor thin film where we take into account the interaction between
itinerant spins and lattice spins. The spin model is an anisotropic Heisenberg
model. We use here the Boltzmann's equation with numerical data on cluster
distribution obtai... | 0912.0989v4 |
2010-05-14 | Effect of phonon dispersion on thermal conduction across Si/Ge interfaces | We report finite-volume simulations of the phonon Boltzmann transport
equation (BTE) for heat conduction across the heterogeneous interfaces in SiGe
superlattices. The diffuse mismatch model incorporating phonon dispersion and
polarization is implemented over a wide range of Knudsen numbers. The results
indicate that t... | 1005.2578v1 |
2010-07-22 | Anisotropic weakly localized transport in nitrogen-doped ultrananocrystalline diamond films | We establish the dominant effect of anisotropic weak localization (WL) in
three dimensions associated with a propagative Fermi surface, on the
conductivity correction in heavily nitrogen doped ultrananocrystalline diamond
(UNCD) films based on magneto-resistance studies at low temperatures. Also, low
temperature electr... | 1007.3918v2 |
2010-09-01 | Anomalous scattering in superconducting indium-doped tin telluride | Results of resistivity, Hall effect, magnetoresistance, susceptibility and
heat capacity measurements are presented for single crystals of indium-doped
tin telluride with compositions Sn$_{.988-x}$In$_x$Te where $0 \leq x \leq 8.4
%$, along with microstructural analysis based on transmission electron
microscopy. For sm... | 1009.0090v1 |
2010-09-06 | Understanding adhesion at as-deposited interfaces from ab initio thermodynamics of deposition growth: thin-film alumina on titanium carbide | We investigate the chemical composition and adhesion of chemical vapour
deposited thin-film alumina on TiC using and extending a recently proposed
nonequilibrium method of ab initio thermodynamics of deposition growth (AIT-DG)
[Rohrer J and Hyldgaard P 2010 Phys. Rev. B 82 045415]. A previous study of
this system [Rohr... | 1009.1027v1 |
2010-09-07 | Phase coherent transport in SrTiO3/LaAlO3 interfaces | The two dimensional electron gas formed between the two band insulators
SrTiO3 and LaAlO3 exhibits a variety of interesting physical properties which
make it an appealing material for use in future spintronics and/or quantum
computing devices. For this kind of applications electrons have to retain their
phase memory fo... | 1009.1273v1 |
2010-10-11 | Restoring the electrical conductivity of graphene oxide films by UV light induced oxygen desorption | We report a chemical free method for the reduction of graphene oxide (GO)
thin films. It was observed how for GO films annealed in air the oxygen species
desorb from the GO surface upon exposure to UV light and how the surface
resistivity of such deoxygenated GO films decreases with increasing the
exposure to the UV li... | 1010.2108v4 |
2010-11-12 | Memory effects in complex materials and nanoscale systems | Memory effects are ubiquitous in nature and are particularly relevant at the
nanoscale where the dynamical properties of electrons and ions strongly depend
on the history of the system, at least within certain time scales. We review
here the memory properties of various materials and systems which appear most
strikingl... | 1011.3053v1 |
2010-12-13 | The split-ring Josephson resonator as an artificial atom | Using the resistive-shunted-junction model we show that a split-ring
Josephson oscillator or radio-frequency SQUID in the hysteretic regime is
similar to an atomic system. It has a number of stationary states that we
characterize. Applying a short magnetic pulse we switch the system from one
state to another. These sta... | 1012.2833v1 |
2010-12-23 | Memristive Systems Analysis of 3-Terminal Devices | Memristive systems were proposed in 1976 by Leon Chua and Sung Mo Kang as a
model for 2-terminal passive nonlinear dynamical systems which exhibit memory
effects. Such systems were originally shown to be relevant to the modeling of
action potentials in neurons in regards to the Hodgkin-Huxley model and, more
recently, ... | 1012.5124v1 |
2011-01-14 | Ni-Mn-Ga films in the austenite and the martensite structures at room temperature: Uniaxial texturation and epitaxial growth | Ni-Mn-Ga films in the austenite and the martensite structures at room
temperature have been obtained using the DC magnetron sputtering technique. Two
elaboration processes were studied. A first batch of samples was deposited
using a resist sacrificial layer in order to release the film from the
substrate before vacuum ... | 1101.2811v1 |
2011-01-31 | Yielding and irreversible deformation below the microscale: Surface effects and non-mean-field plastic avalanches | Nanoindentation techniques recently developed to measure the mechanical
response of crystals under external loading conditions reveal new phenomena
upon decreasing sample size below the microscale. At small length scales,
material resistance to irreversible deformation depends on sample morphology.
Here we study the me... | 1102.0019v2 |
2011-05-11 | Linear magnetoresistance in commercial n-type silicon due to inhomogeneous doping | Free electron theory tells us that resistivity is independent of magnetic
field. In fact, most observations match the semiclassical prediction of a
magnetoresistance that is quadratic at low fields before saturating. However, a
non-saturating linear magnetoresistance has been observed in exotic
semiconductors such as s... | 1105.2174v1 |
2011-05-27 | Development of correlated quasiparticle conductance peak as molecule-linked gold nanoparticle films transition from Mott-insulator to metal phases | We have studied conductance ($\it{g}$) of butanedithiol-linked gold
nanoparticle films across a percolation insulator-to-metal transition. As the
transition proceeds, electrons become itinerant (i.e. Coulomb charging and
kinetic effects are both significant), and films exhibit a previously
unobserved zero-bias conducta... | 1105.5647v1 |
2011-07-31 | Observation of Quantized Hall Effect and Shubnikov-de Hass Oscillations in Highly Doped Bi2Se3: Evidence for Layered Transport of Bulk Carriers | Bi2Se3 is an important semiconductor thermoelectric material and a prototype
topological insulator. Here we report observation of Shubnikov-de Hass (SdH)
oscillations accompanied by quantized Hall resistances (Rxy) in highly-doped
n-type Bi2Se3 with bulk carrier concentrations of few 10^19 cm^-3. Measurements
under til... | 1108.0204v2 |
2011-08-30 | Linear magnetoresistivity in the ternary AM2B2 and A3Rh8B6 phases (A = Ca, Sr; M = Rh, Ir) | We studied the magnetoresistivity of the AM2B2 and A3Rh8B6 (A = Ca, Sr; M =
Rh, Ir) compounds within the ranges 1.8<=T<=300 K and 0<=H<=50 kOe. The
zero-field resistivity {\rho}0(T) is metallic and follows closely the
Bloch-Gr\"uneisen description. A positive, nonsaturating, and dominantly
linear-in-H magnetoresistivit... | 1108.5803v1 |
2011-09-22 | Microscopic model for the ferroelectric field effect in oxide heterostructures | A microscopic model Hamiltonian for the ferroelectric field effect is
introduced for the study of oxide heterostructures with ferroelectric
components. The long-range Coulomb interaction is incorporated as an
electrostatic potential, solved self-consistently together with the charge
distribution. A generic double-excha... | 1109.4791v1 |
2011-10-09 | Optimizing the Bi_(2-x)Sb_(x)Te_(3-y)Se_(y) solid solutions to approach the intrinsic topological insulator regime | To optimize the bulk-insulating behavior in the topological insulator
materials having the tetradymite structure, we have synthesized and
characterized single-crystal samples of Bi_(2-x)Sb_(x)Te_(3-y)Se_(y) (BSTS)
solid solution at various compositions. We have elucidated that there are a
series of "intrinsic" composit... | 1110.1788v1 |
2011-10-24 | Ni(111)|Graphene|h-BN Junctions as Ideal Spin Injectors | Deposition of graphene on top of hexagonal boron nitride (h-BN) was very
recently demonstrated while graphene is now routinely grown on Ni. Because the
in-plane lattice constants of graphite, h-BN, graphite-like BC2N and of the
close-packed surfaces of Co, Ni and Cu match almost perfectly, it should be
possible to prep... | 1110.5291v1 |
2011-11-30 | Synthesis, Characterization, and Finite Size Effects on Electrical Transport of Nanoribbons of the Charge-Density Wave Conductor NbSe3 | NbSe3 exhibits remarkable anisotropy in most of its physical properties and
has been a model system for studies of quasi-one-dimensional
charge-density-wave (CDW) phenomena. Herein, we report the synthesis,
characterization, and electrical transport of single-crystalline NbSe3
nanoribbons by a facile one-step vapour tr... | 1112.0039v1 |
2012-04-02 | Phase Stability, Structures and Properties of the (Bi2)m(Bi2Te3)n Natural Superlattices | The phase stability of the (Bi2)m(Bi2Te3)n natural superlattices has been
investigated through the low temperature solid state synthesis of a number of
new binary BixTe1-x compositions. Powder X-ray diffraction revealed that an
infinitely adaptive series forms for 0.44 < x < 0.70, while an unusual 2-phase
region with c... | 1204.0356v1 |
2012-05-16 | Spin transport and spin dephasing in zinc oxide | The wide bandgap semiconductor ZnO is interesting for spintronic applications
because of its small spin-orbit coupling implying a large spin coherence
length. Utilizing vertical spin valve devices with ferromagnetic electrodes
(TiN/Co/ZnO/Ni/Au), we study the spin-polarized transport across ZnO in
all-electrical experi... | 1205.3666v3 |
2012-05-28 | Visualizing Landau levels of Dirac electrons in a one dimensional potential | Using scanning tunneling spectroscopy we have measured the response of Dirac
electrons in a magnetic field to the presence of a well-defined smoothly
varying 1D periodic potential. We find that the lower index Landau level
energies reliably trace the potential variations, while the higher index levels
appear surprising... | 1205.6230v2 |
2012-07-14 | Topological phase transition induced by random substitution | The transition from topologically nontrivial to a trivial state is studied by
first-principles calculations on bulk zinc-blende type
(Hg$_{1-x}$Zn$_x$)(Te$_{1-x}$S$_x$) disordered alloy series. The random
chemical disorder was treated by means of the Coherent Potential Approximation.
We found that although the phase tr... | 1207.3463v1 |
2012-07-23 | Superconducting and thermoelectric properties of new layered Superconductor Bi4O4S3 | Polycrystalline sample of the new layered superconductor Bi4O4S3 is
successfully synthesized by solid-state reaction method by using Bi, S and
Bi2O3 powders with one step reaction. The superconducting transition
temperature (Tconset=4.5 K), the zero resistance transition temperature
(Tc0=4.07 K) and the diamagnetic tra... | 1207.5395v1 |
2012-09-13 | Topological-Metal to Band-Insulator Transition in (Bi1-xInx)2Se3 Thin Films | By combining transport and photo emission measurements on (Bi1-xInx)2Se3 thin
films, we report that this system transforms from a topologically non-trivial
metal into a topologically trivial band insulator through three quantum phase
transitions. At x = 3-7%, there is a transition from a topologically
non-trivial metal... | 1209.2840v1 |
2012-11-01 | Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect | We report anisotropic magnetoresistance in Pt|Y3Fe5O12 bilayers. In spite of
Y3Fe5O12 being a very good electrical insulator, the resistance of the Pt layer
reflects its magnetization direction. The effect persists even when a Cu layer
is inserted between Pt and Y3Fe5O12, excluding the contribution of induced
equilibri... | 1211.0098v1 |
2012-11-07 | Tuning the thermoelectric properties of SrTiO3 by controlled oxygen doping | We report the thermoelectric properties (Seebeck coefficient, thermal
conductivity, and electrical resistivity) of lightly doped single crystals of
(001)-oriented SrTiO3 (STO). Hall effect measurements show that electron doping
around 10^-5 carriers per unit cell can be achieved by vacuum annealing of the
crystals unde... | 1211.1615v1 |
2012-12-21 | Multigap RPC for PET: development and optimisation of the detector design | Transforming the resistive plate chambers from charged-particle into
gamma-quanta detectors opens the way towards their application as a basic
element of a hybrid imaging system, which combines positron emission tomography
(PET) with magnetic resonance imaging (MRI) in a single device and provides
non- and minimally- i... | 1212.5551v1 |
2013-02-18 | Comparative Measurements of Inverse Spin Hall and Magnetoresistance in YIG|Pt and YIG|Ta | We report on a comparative study of spin Hall related effects and
magnetoresistance in YIG|Pt and YIG|Ta bilayers. These combined measurements
allow to estimate the characteristic transport parameters of both Pt and Ta
layers juxtaposed to YIG: the spin mixing conductance $G_{\uparrow \downarrow}$
at the YIG$|$normal m... | 1302.4416v1 |
2013-02-20 | Anomalous metallic state above the upper critical field of the conventional three-dimensional superconductor AgSnSe2 with strong intrinsic disorder | We report superconducting properties of AgSnSe2 which is a conventional
type-II superconductor in the very dirty limit due to intrinsically strong
electron scatterings. While this material is an isotropic three-dimensional
(3D) superconductor with a not-so-short coherence length where strong vortex
fluctuations are NOT... | 1302.4787v1 |
2013-03-06 | Li$_2$RhO$_3$: A spin-glassy relativistic Mott insulator | Motivated by the rich interplay among electronic correlation, spin-orbit
coupling (SOC), crystal-field splitting, and geometric frustrations in the
honeycomb-like lattice, we systematically investigated the electronic and
magnetic properties of Li$_2$RhO$_3$. The material is semiconducting with a
narrow band gap of $\D... | 1303.1235v2 |
2013-06-13 | Combinatorial search of superconductivity in Fe-B composition spreads | We have fabricated Fe-B thin film composition spreads in search of possible
superconducting phases following a theoretical prediction by Kolmogorov et
al.^1 Co-sputtering was used to deposit spreads covering a large compositional
region of the Fe-B binary phase diagram. A trace of superconducting phase was
found in the... | 1306.3024v1 |
2013-07-16 | Correlating toughness and roughness in ductile fracture | Three dimensional calculations of ductile crack growth under mode I plane
strain, small scale yielding conditions are carried out using an
elastic-viscoplastic constitutive relation for a progres- sively cavitating
plastic solid with two populations of void nucleating second phase particles.
Full field solutions are ob... | 1307.4413v1 |
2013-08-30 | A linear nonequilibrium thermodynamics approach to optimization of thermoelectric devices | Improvement of thermoelectric systems in terms of performance and range of
applications relies on progress in materials science and optimization of device
operation. In this chapter, we focuse on optimization by taking into account
the interaction of the system with its environment. For this purpose, we
consider the il... | 1308.6735v1 |
2013-09-24 | Efficient Gate-tunable light-emitting device made of defective boron nitride nanotubes: from ultraviolet to the visible | Boron nitride is a promising material for nanotechnology applications due to
its two-dimensional graphene-like, insulating, and highly-resistant structure.
Recently it has received a lot of attention as a substrate to grow and isolate
graphene as well as for its intrinsic UV lasing response. Similar to carbon,
one-dime... | 1309.6117v1 |
2013-10-11 | Dropping the Ball: The effect of anisotropic granular materials on ejecta and impact crater shape | In this fluid dynamics video, we present an experimental investigation of the
shape of impact craters in granular materials. Complex crater shapes, including
polygons, have been observed in many terrestrial planets as well as moons and
asteroids. We release spherical projectiles from different heights above a
granular ... | 1310.3290v1 |
2013-10-20 | Impurity effects in Cu$_2$O | The doping of wide gap semiconductors is an interesting problem both from the
scientific and technological point of view. A well known example of this
problem is the doping of Cu$_2$O. The only element which has produced an order
of magnitude increase in the conductivity of Cu$_2$O bulk samples is chlorine,
as previous... | 1310.5341v1 |
2013-11-07 | Magnetic domain and magnetic resistance phase transition in strongly correlated electronic material of perovskites junction | The junction magnetoresistivity and domain phase transition were studied
between ZnO and La0.4Gd0.1Sr0.5CoO3 thin films grown on LaAlO3 (100) substrates
epitaxially by pulse laser deposit. The ferromagnetic transformation into
phase-separated (two phase) state was displayed below Tc~127 and has observed
that the lattic... | 1311.1650v1 |
2013-11-17 | First-principle study of octahedral tilting and Ferroelectric like transition in metallic LiOsO3 | The octahedral tilting and ferroelectric-like structural transition of LiOsO3
metallic perovskite [Nature Materials 12, 1024 (2013)] was examined using
first-principles density-functional theory. In LiOsO3, a-a-a- octahedral
titling mode is responsible for the cubic to rhombohedral structural
transition, which is stabl... | 1311.4139v1 |
2014-02-24 | Experimental realization of a semiconducting full Heusler compound: Fe2TiSi | Single-phase films of the full Heusler compound Fe2TiSi have been prepared by
magnetron sputtering. The compound is found to be a semiconductor with a gap of
0.4eV. The electrical resistivity has a logarithmic temperature dependence up
to room temperature due to Kondo scattering of a dilute free electron gas off
superp... | 1402.5755v1 |
2014-03-12 | Magnetoresistance of double layer hybrid system in tilted magnetic field | Magnetoresistance and Hall coefficient of a graphene layer are investigated
in the presence of a tilted magnetic field. We consider the graphene layer is
assembled by either another graphene layer or a two-dimensional electron gas
(2DEG) and an interlayer electron-electron interaction is modeled within Random
Phase App... | 1403.2857v2 |
2014-03-28 | Doping nature of native defects in 1T-TiSe2 | The transition metal dichalcogenide 1T-TiSe2 is a quasi two-dimensional
layered material with a charge density wave (CDW) transition temperature of
TCDW 200 K. Self-doping effects for crystals grown at different temperatures
introduce structural defects, modify the temperature dependent resistivity and
strongly perturb... | 1403.7339v2 |
2014-04-08 | Modulation of pure spin currents with a ferromagnetic insulator | We propose and demonstrate spin manipulation by magnetically controlled
modulation of pure spin currents in cobalt/copper lateral spin valves,
fabricated on top of the magnetic insulator Y$_3$Fe$_5$O$_{12}$ (YIG). The
direction of the YIG magnetization can be controlled by a small magnetic field.
We observe a clear mod... | 1404.2311v2 |
2014-04-10 | Tunable chiral spin texture in magnetic domain-walls | Magnetic domain-walls (DWs) with a preferred chirality exhibit very efficient
current-driven motion. Since structural inversion asymmetry (SIA) is required
for their stability, the observation of chiral domain walls in highly symmetric
Pt/Co/Pt is intriguing. Here, we tune the layer asymmetry in this system and
observe... | 1404.2945v1 |
2014-04-17 | Extreme thermopower anisotropy and interchain transport in the quasi-one-dimensional metal Li(0.9)Mo(6)O(17) | Thermopower and electrical resistivity measurements transverse to the
conducting chains of the quasi-one-dimensional metal Li(0.9)Mo(6)O(17) are
reported in the temperature range 5 K <= T <= 500 K. For T>= 400 K the
interchain transport is determined by thermal excitation of charge carriers
from a valence band ~ 0.14 e... | 1404.4576v3 |
2014-05-15 | Damage nucleation from repeated dislocation absorption at a grain boundary | Damage nucleation from repeated dislocation absorption at a grain boundary is
simulated with molecular dynamics. At the grain boundary-dislocation
intersection site, atomic shuffling events determine how the free volume
brought by the incoming dislocation is accommodated. This process in turn
determines the crack nucle... | 1405.3974v2 |
2014-06-04 | Magnetic-Field Induced Semimetal in Topological Crystalline Insulator Thin Films | We investigate electromagnetic properties of a topological crystalline
insulator (TCI) thin film under external electromagnetic fields. The TCI thin
film is a topological insulator indexed by the mirror-Chern number. It is
demonstrated that the gap closes together with the emergence of a pair of
gapless cones carrying ... | 1406.1009v2 |
2014-06-05 | Magnetotransport in ferromagnetic Mn5Ge3, Mn5Ge3C0.8, and Mn5Si3C0.8 thin films | The electrical resistivity, anisotropic magnetoresistance (AMR), and
anomalous Hall effect of ferromagnetic Mn5Ge3, Mn5Ge3C0.8, and Mn5Si3C0.8 thin
films has been investigated. The data show a behavior characteristic for a
ferromagnetic metal, with a linear increase of the anomalous Hall coefficient
with Curie temperat... | 1406.1442v1 |
2014-07-16 | Mesoscale Imperfections in MoS2 Atomic Layers Grown by Vapor Transport Technique | The success of isolating small flakes of atomically thin layers through
mechanical exfoliation has triggered enormous research interest in graphene and
other two-dimensional materials. For device applications, however, controlled
large-area synthesis of highly crystalline monolayers with a low density of
electronically... | 1407.4188v1 |
2014-07-30 | Synthesis and transport properties of ternary type-I Si clathrate K8Al7Si39 | A ternary type-I Si clathrate, K8AlxSi46-x, which is a candidate functional
material composed of abundant non-toxic elements, was synthesized and its
transport properties were investigated at temperatures ranging from 10 to 320
K. The synthesized compound is confirmed to be the ternary type-I Si clathrate
K8Al7Si39 wit... | 1407.7911v2 |
2014-08-30 | Chemical Pressure effect at the boundary of Mott insulator and itinerant electron limit of Spinel Vanadates | The chemical pressure effect on the structural, transport, magnetic and
electronic properties (by measuring X-ray photoemission spectroscopy) of ZnV2O4
has been investigated by doping Mn and Co on the Zinc site of ZnV2O4. With Mn
doping the V-V distance increases and with Co doping it decreases. The
resistivity and the... | 1409.0106v1 |
2014-12-23 | Temperature controlled motion of an antiferromagnet-ferromagnet interface within a dopant-graded FeRh epilayer | Chemically ordered B2 FeRh exhibits a remarkable
antiferromagnetic-ferromagnetic phase transition that is first order. It thus
shows phase coexistence, usually by proceeding though nucleation at random
defect sites followed by propagation of phase boundary domain walls. The
transition occurs at a temperature that can b... | 1412.7346v1 |
2015-01-21 | Efficient Linear Scaling Approach for Computing the Kubo Hall Conductivity | We report an order-N approach to compute the Kubo Hall conductivity for
disorderd two-dimensional systems reaching tens of millions of orbitals, and
realistic values of the applied external magnetic fields (as low as a few
Tesla). A time-evolution scheme is employed to evaluate the Hall conductivity
$\sigma_{xy}$ using... | 1501.05100v2 |
2015-01-26 | Raman scattering investigation of large positive magnetoresistance material WTe$_2$ | We have performed polarized Raman scattering measurements on WTe$_2$, for
which an extremely large positive magnetoresistance has been reported recently.
We observe 5 A$_1$ phonon modes and 2 A$_2$ phonon modes out of 33 Raman active
modes, with frequencies in good accordance with first-principles calculations.
The ang... | 1501.06321v3 |
2015-02-17 | Superconducting Dome and Crossover to an Insulating State in [Tl4]Tl1-xSnxTe3 | The structural, superconducting, and electronic phase diagram of
[Tl4]Tl1-xSnxTe3 is reported. Magnetization and specific heat measurements show
bulk superconductivity exists for 0 < x < 0.4. Resistivity measurements
indicate a crossover from a metallic state for low dopings to a doped insulator
at x = 1. Universally, ... | 1502.05059v2 |
2015-02-24 | Room temperature magnetodielectric studies on Mn doped LaGaO3 | The polycrystalline samples of LaGa1-xMnxO3 (0<x<0.3) has been prepared by
solid state reaction route. The phase purity of these samples has been
confirmed by powder x-ray diffraction experiments carried out on BL-12 at
Indus-2 synchrotron radiation source. The sample with x=0.2 shows significant
change in the value of... | 1502.06887v2 |
2015-03-18 | Atomically Thin Resonant Tunnel Diodes built from Synthetic van der Waals Heterostructures | Vertical integration of two-dimensional van der Waals materials is predicted
to lead to novel electronic and optical properties not found in the constituent
layers. Here, we present the direct synthesis of two unique, atomically thin,
multi-junction heterostructures by combining graphene with the monolayer
transition-m... | 1503.05592v1 |
2015-09-17 | Microwave Loss Reduction in Cryogenically Cooled Conductors | Measurements of microwave attenuation at room temperature and 4.2 K have been
performed on some conductors commonly used in receiver input circuits. The
reduction in loss on cooling is substantial, particularly for copper and plated
gold, both of which showed a factor of 3 loss reduction. Copper passivated with
benzotr... | 1509.05273v1 |
2015-09-17 | Symmetry constraints on the elastoresistivity tensor | The elastoresistivity tensor $m_{ij,kl}$ characterizes changes in a
material's resistivity due to strain. As a fourth-rank tensor,
elastoresistivity can be a uniquely useful probe of the symmetries and
character of the electronic state of a solid. We present a symmetry analysis of
$m_{ij,kl}$ (both in the presence and ... | 1509.05462v1 |
2015-10-19 | Structure, Energy, and Thermal Transport Properties of Si-SiO$_2$ Nanostructures using an Ab initio based Parameterization of a Charge-Optimized Many-Body Forcefield | In an effort to extend the reach of current ab initio calculations to
simulations requiring millions of configurations for complex systems such as
heterostructures, we have parameterized the third-generation Charge Optimized
Many-Body (COMB3) potential using solely ab initio total energies, forces, and
stress tensors a... | 1510.05416v1 |
2015-11-07 | Anomalous magneto-elastic and charge doping effects in thallium-doped BaFe2As2 | Within the BaFe2As2 crystal lattice, we partially substitute thallium for
barium and report the effects of interlayer coupling in Ba1-xTlxFe2As2
crystals. We demonstrate the unusual effects of magneto-elastic coupling and
charge doping in this iron-arsenide material, whereby Neel temperature rises
with small x, and the... | 1511.02400v1 |
2015-11-24 | Transport and thermodynamic properties under anharmonic motion in type-I Ba8Ga16Sn30 clathrate | Anharmonic guest atom oscillation has direct connection to the thermal
transport and thermo- electric behavior of type-I Ba8Ga16Sn30 clathrates. This
behavior can be observed through several physical properties, with for example
the heat capacity providing a measure of the overall excita- tion level
structure. Localize... | 1511.07594v1 |
2015-11-28 | Extremely large magnetoresistance in few-layer graphene/boron-nitride heterostructures | Understanding magnetoresistance, the change in electrical resistance upon an
external magnetic field, at the atomic level is of great interest both
fundamentally and technologically. Graphene and other two-dimensional layered
materials provide an unprecedented opportunity to explore magnetoresistance at
its nascent sta... | 1511.08867v1 |
2015-12-22 | Large-signal model of the bilayer graphene field-effect transistor targeting radio-frequency applications: theory versus experiment | Bilayer graphene is a promising material for radio-frequency transistors
because its energy gap might result in a better current saturation than the
monolayer graphene. Because the great deal of interest in this technology,
especially for flexible radio-frequency applications, gaining control of it
requires the formula... | 1512.07159v1 |
2016-01-21 | Saturation of ion irradiation effects in Cr2AlC | Cr2AlC materials were irradiated with 7 MeV Xe26+ ions and 500 keV He2+ ions
at room temperature. A structural transition with an increased c lattice
parameter and a decreased a lattice parameter occurs after irradiation to doses
above 1 dpa. Nevertheless, the modified structure is stable up to the dose of
5.2 dpa with... | 1601.05514v1 |
2016-02-02 | Fast synthesis of Fe1.1Se1-xTex superconductors in a self-heating and furnace-free way | A fast and furnace-free method of combustion synthesis is employed for the
first time to synthesize iron-based superconductors. Using this method,
Fe1.1Se1-xTex (0<=x<=1) samples can be prepared from self-sustained reactions
of element powders in only tens of seconds. The obtained Fe1.1Se1-xTex samples
show clear zero ... | 1602.00880v1 |
2016-02-11 | A multiscale model of distributed fracture and permeability in solids in all-round compression | We present a microstructural model of permeability in fractured solids, where
the fractures are described in terms of recursive families of parallel,
equidistant cohesive faults. Faults originate upon the attainment of a tensile
or shear resistance in the undamaged material. Secondary faults may form in a
hierarchical ... | 1602.03801v2 |
2016-04-04 | Universal scaling for the spin-electricity conversion on surface states of topological insulators | We have investigated spin-electricity conversion on surface states of
bulk-insulating topological insulator (TI) materials using a spin pumping
technique. The sample structure is Ni-Fe|Cu|TI trilayers, in which magnetic
proximity effects on the TI surfaces are negligibly small owing to the inserted
Cu layer. Voltage si... | 1604.00751v1 |
2016-04-06 | Enhanced Thermoelectric Power and Electronic Correlations in RuSe$_2$ | We report the electronic structure, electric and thermal transport properties
of Ru$_{1-x}$Ir$_{x}$Se$_2$ ($x \leq 0.2$). RuSe$_2$ is a semiconductor that
crystallizes in a cubic pyrite unit cell. The Seebeck coefficient of RuSe$_2$
exceeds -200 $\mu$V/K around 730 K. Ir substitution results in the suppression
of the r... | 1604.01755v1 |
2016-04-12 | EPW: Electron-phonon coupling, transport and superconducting properties using maximally localized Wannier functions | The EPW (Electron-Phonon coupling using Wannier functions) software is a
Fortran90 code that uses density-functional perturbation theory and maximally
localized Wannier functions for computing electron-phonon couplings and related
properties in solids accurately and efficiently. The EPW v4 program can be used
to comput... | 1604.03525v2 |
2016-05-09 | A non-volatile memory based on nonlinear magnetoelectric effects | The magnetoelectric effects in multiferroics have a great potential in
creating next-generation memory devices. We conceive a new concept of
non-volatile memories based on a type of nonlinear magnetoelectric effects
showing a butterfly-shaped hysteresis loop. The principle is to utilize the
states of the magnetoelectri... | 1605.02505v1 |
2016-05-17 | Pressure-induced gap closing and metallization of MoSe$_{2}$ and MoTe$_{2}$ | Layered molybdenum dichalchogenides are semiconductors whose gap is
controlled by delicate interlayer interactions. The gap tends to drop together
with the interlayer distance, suggesting collapse and metallization under
pressure. We predict, based on first principles calculations, that layered
semiconductors 2H$_c$-Mo... | 1605.05111v1 |
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