publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
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2023-07-31 | Ferroelectricity in tetragonal ZrO$_2$ thin films | We report on the crystal structure and ferroelectric properties of epitaxial
ZrO$_2$ films ranging from 7 to 42 nm thickness grown on
La$_{0.67}$Sr$_{0.33}$MnO$_3$-buffered (110)-oriented SrTiO$_3$ substrate. By
employing X-ray diffraction, we confirm a tetragonal phase at all investigated
thicknesses, with slight in-p... | 2307.16492v1 |
2023-08-16 | Automated Semiconductor Defect Inspection in Scanning Electron Microscope Images: a Systematic Review | A growing need exists for efficient and accurate methods for detecting
defects in semiconductor materials and devices. These defects can have a
detrimental impact on the efficiency of the manufacturing process, because they
cause critical failures and wafer-yield limitations. As nodes and patterns get
smaller, even hig... | 2308.08376v2 |
2023-10-05 | Spin-orbit torques and spin Hall magnetoresistance generated by twin-free and amorphous Bi0.9Sb0.1 topological insulator films | Topological insulators have attracted great interest as generators of
spin-orbit torques (SOTs) in spintronic devices.
Bi\textsubscript{1-x}Sb\textsubscript{x} is a prominent topological insulator
that has a high charge-to-spin conversion efficiency. However, the origin and
magnitude of the SOTs induced by current-inje... | 2310.03487v1 |
2023-12-09 | Extended Kohler's Rule of Magnetoresistance in TaCo$_2$Te$_2$ | TaCo$_2$Te$_2$ is recently reported to be an air-stable, high mobility Van
der Waals material with probable magnetic order. Here we investigate the
scaling behavior of its magnetoresistance. We measured both the longitudinal
($\rho_{xx}$) and Hall ($\rho_{xy}$) magnetoresistivities of TaCo$_2$Te$_2$
crystals in magneti... | 2312.05624v1 |
2023-12-16 | Electronic phase transition, vibrational properties and structural stability of single and two polyyne chains under external electric field | Search for one dimensional (1D) van der Waals materials has become an urgent
need to meet the demand as building blocks for high performance, miniaturized,
lightweight device applications. Polyyne, a 1D atomic chain of carbon is the
thinnest and strongest allotrope of carbon, showing promising applications in
new gener... | 2312.10335v1 |
2024-02-06 | Observation of the double quantum spin Hall phase in moiré WSe2 | Quantum spin Hall (QSH) insulators are a topologically protected phase of
matter in two dimensions that can support non-dissipative spin transport. A
hallmark of the phase is a pair of helical edge states surrounding an
insulating bulk. A higher (even) number of helical edge state pairs is usually
not possible in real ... | 2402.04196v1 |
2024-02-13 | Coarse-Graining in Space versus Time | Understanding the structure and dynamics of liquids is pivotal for the study
of larger spatiotemporal processes, particularly for glass-forming materials at
low temperatures. The so-called thermodynamic scaling relation, validated for
many molecular systems through experiments, offers an efficient means to
explore a va... | 2402.08675v1 |
2024-02-27 | Design principles of nonlinear optical materials for Terahertz lasers | We have investigated both inter-band and intra-band second order nonlinear
optical conductivity based on the velocity correlation formalism and the
spectral expansion technique. We propose a scenario in which the second order
intra-band process is nonzero while the inter-band process is zero. This occurs
for a band str... | 2402.17126v1 |
2024-03-25 | Multi-Objective Quality-Diversity for Crystal Structure Prediction | Crystal structures are indispensable across various domains, from batteries
to solar cells, and extensive research has been dedicated to predicting their
properties based on their atomic configurations. However, prevailing Crystal
Structure Prediction methods focus on identifying the most stable solutions
that lie at t... | 2403.17164v1 |
2002-08-26 | Magnetized Accretion-Ejection Structures: 2.5D MHD simulations of continuous Ideal Jet launching from resistive accretion disks | We present numerical magnetohydrodynamic (MHD) simulations of a magnetized
accretion disk launching trans-Alfvenic jets. These simulations, performed in a
2.5 dimensional time-dependent polytropic resistive MHD framework, model a
resistive accretion disk threaded by an initial vertical magnetic field. The
resistivity i... | 0208459v1 |
2006-02-17 | Coupling losses and transverse resistivity of multifilament YBCO coated superconductors | We studied the magnetization losses of four different types of filamentary
YBCO coated conductors. A 10 mm wide YBCO coated conductor was subdivided into
20 filaments by laser cutting. The separation of coupling loss from the total
is possible because the energy loss per cycle in samples with electrically
insulated fil... | 0602422v1 |
2007-02-21 | Electrical current-driven pinhole formation and insulator-metal transition in tunnel junctions | Current Induced Resistance Switching (CIS) was recently observed in thin
tunnel junctions (TJs) with ferromagnetic (FM) electrodes and attributed to
electromigration of metallic atoms in nanoconstrictions in the insulating
barrier. The CIS effect is here studied in TJs with two thin (20 \AA)
non-magnetic (NM) Ta electr... | 0702501v2 |
2008-12-15 | Nanomechanical detection of antibiotic-mucopeptide binding in a model for superbug drug resistance | The alarming growth of the antibiotic-resistant superbugs
methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant
Enterococcus (VRE) is driving the development of new technologies to
investigate antibiotics and their modes of action. We report the label-free
detection of vancomycin binding to bacter... | 0812.2728v1 |
2010-05-19 | Resistance in Superconductors | In this pedagogical review, we discuss how electrical resistance can arise in
superconductors. Starting with the idea of the superconducting order parameter
as a condensate wave function, we introduce vortices as topological excitations
with quantized phase winding, and we show how phase slips occur when vortices
cross... | 1005.3347v1 |
2013-06-28 | Impact of sintering temperature on room temperature magneto-resistive and magneto-caloric properties of Pr2/3Sr1/3MnO3 | Magneto-resistive and magneto-caloric properties of polycrystalline
Pr2/3Sr1/3MnO3 have been studied as a function of sintering temperature (Ts)
between 1260-1450{\deg}C. Reitveld refinement of their X-ray diffraction (XRD)
patterns confirms their single phase crystalline structure with orthorhombic
Pbnm space group. T... | 1306.6792v2 |
2014-11-15 | Shock-waves and commutation speed of memristors | Progress of silicon based technology is nearing its physical limit, as
minimum feature size of components is reaching a mere 10 nm. The resistive
switching behaviour of transition metal oxides and the associated memristor
device is emerging as a competitive technology for next generation electronics.
Significant progre... | 1411.4198v3 |
2015-09-29 | Extraordinary Hall resistance and unconventional magnetoresistance in Pt/LaCoO3 hybrids | We report an investigation of transverse Hall resistance and longitudinal
resistance on Pt thin films sputtered on epitaxial LaCoO$_3$ (LCO)
ferromagnetic insulator films. The LaCoO$_3$ films were deposited on several
single crystalline substrates [LaAlO$_3$ (LAO), (La,Sr)(Al,Ta)O$_3$ (LSAT), and
SrTiO$_3$ (STO)] with ... | 1509.08691v1 |
2016-02-24 | Contact resistances in trigate and FinFET devices in a Non-Equilibrium Green's Functions approach | We compute the contact resistances $R_{\rm c}$ in trigate and FinFET devices
with widths and heights in the 4 to 24 nm range using a Non-Equilibrium Green's
Functions approach. Electron-phonon, surface roughness and Coulomb scattering
are taken into account. We show that $R_{\rm c}$ represents a significant part
of the... | 1602.07545v1 |
2017-10-26 | Effect of air confinement on thermal contact resistance in nanoscale heat transfer | We report herein the pressure dependent thermal contact resistance (Rc)
between Wollaston wire thermal probe and samples which is evaluated within the
framework of an analytical model. This work presents heat transfer between the
Wollaston wire thermal probe and samples at nanoscale for different air
pressure ranging f... | 1710.09501v1 |
2017-11-08 | Surface impedance and optimum surface resistance of a superconductor with imperfect surface | We calculate a low-frequency surface impedance of a dirty, s-wave
superconductor with an imperfect surface incorporating either a thin layer with
a reduced pairing constant or a thin, proximity-coupled normal layer. Such
structures model realistic surfaces of superconducting materials which can
contain oxide layers, ab... | 1711.03077v1 |
2018-02-15 | Parallel magnetic field suppresses dissipation in superconducting nanostrips | The motion of Abrikosov vortices in type-II superconductors results in a
finite resistance in the presence of an applied electric current. Elimination
or reduction of the resistance via immobilization of vortices is the "holy
grail" of superconductivity research. Common wisdom dictates that an increase
in the magnetic ... | 1802.05673v1 |
2018-05-22 | Structural properties and anisotropic electronic transport in SrIrO3 films | Perovskite SrIrO3 (SIO) films epitaxially deposited with a thickness of about
60 nm on various substrate materials display nearly strain-relieved state.
Films grown on orthorhombic (110) DyScO3 (DSO) are found to display untwinned
bulk-like orthorhombic structure. However, film deposition on cubic (001)
SrTiO3 induces ... | 1805.08473v2 |
2022-02-24 | Thermal spreading resistance of GaN HEMTs with heat source heating studied by hybrid Monte Carlo-diffusion simulations | Exact assessment of thermal spreading resistance is of great importance to
the thermal management of electronic devices, especially when completely
considering the heat conduction process from the nanoscale heat source to the
macroscopic scale heat sink. The existing simulation methods are either based
on convectional ... | 2202.13770v1 |
2007-10-10 | Strong Reduction of the Field-Dependent Microwave Surface Resistance in YBCO with BaZrO_3 Inclusions | We present measurements of the magnetic field dependent microwave surface
resistance in laser-ablated YBa$_2$Cu$_3$O$_{7-\delta}$ films on SrTiO$_3$
substrates. BaZrO$_3$ crystallites were included in the films using composite
targets containing BaZrO$_3$ inclusions with mean grain size smaller than 1
$\mu$m. X-ray dif... | 0710.1953v1 |
2018-07-19 | Theoretical study of scattering in graphene ribbons in the presence of structural and atomistic edge roughness | We investigate the diffusive electron-transport properties of charge-doped
graphene ribbons and nanoribbons with imperfect edges. We consider different
regimes of edge scattering, ranging from wide graphene ribbons with (partially)
diffusive edge scattering to ribbons with large width variations and
nanoribbons with at... | 1807.07263v2 |
2020-10-07 | Correlation of uniaxial magnetic anisotropy axes and principal resistivities in polycrystalline ferromagnetic films | In the present study, we demonstrate the measurement of resistivity tensor
($\rho$) along the magnetic axes of a polycrystalline film of ferromagnetic
permalloy (Py). To this end, conventional Hall-bar and a more recent extended
van der Pauw methods were utilized for determining 2D $\rho$ in the film plane.
The samples... | 2010.03554v3 |
2020-12-31 | DC Resistance Degradation of SrTiO$_3$: The Role of Virtual-Cathode Needles and Oxygen Bubbles | This study of highly accelerated lifetime tests of SrTiO$_3$, a model
semiconducting oxide, is motivated by the interest in reliable multilayer
ceramic capacitors and resistance-switching thin-film devices. Our analytical
solution to oxygen-vacancy migration under a DC voltage -- the cause of
resistance degradation in ... | 2012.15777v1 |
2021-04-12 | Temperature-linear Resistivity in Twisted Double Bilayer Graphene | We report an experimental study of carrier density (n), displacement field
(D) and twist angle ({\theta}) dependence of temperature (T)-linear resistivity
in twisted double bilayer graphene (TDBG). For a large twist angle
({\theta}>1.5{\deg}) where correlated insulating states are absent, we observe
a T-linear resistiv... | 2104.05406v3 |
2022-01-06 | Coulomb drag in metal monochalcogenides double-layer structures with Mexican-hat band dispersions | We theoretically study the Coulomb drag resistivity and plasmon modes
behavior for a system composed of two parallel p-type doped GaS monolayers with
Mexican-hat valence energy band using the Boltzmann transport theory formalism.
We investigate the effect of temperature,$\ T$, carrier density,$\ p$, and
layer separatio... | 2201.02077v1 |
2023-02-14 | Acoustic phonon contribution to the resistivity of twisted bilayer graphene | We calculate the contribution to the doping ($n$) and temperature ($T$)
dependence of the electrical resistivity of twisted bilayer graphene (TBLG) due
to scattering by acoustic phonons. Our calculation retains the full
Bistritzer-MacDonald (BM) band structure, with a focus on understanding the
role of the complicated ... | 2302.07275v3 |
2023-04-21 | Star-Mesh Quantized Hall Array Resistance Devices | Advances in the development of graphene-based technology have enabled
improvements in DC resistance metrology. Devices made from epitaxially grown
graphene have replaced the GaAs-based counterparts, leading to an easier and
more accessible realization of the ohm. By optimizing the scale of the growth,
it has become pos... | 2304.11243v1 |
2023-06-12 | Symmetric, off-diagonal, resistance from rotational symmetry breaking in graphene-WSe$_2$ heterostructure: prediction for a large magic angle in a Moire system | We show that any two-dimensional system with a non-zero \textit{symmetric}
off-diagonal component of the resistance matrix, $R_{xy}=R_{yx} \neq 0$, must
have the in-plane rotational symmetry broken down to $C_2$. Such a resistance
response is Ohmic, and is different from the Hall response which is the
\textit{anti-symm... | 2306.06840v2 |
2024-03-04 | Electric field induced resistive switching in M$^{3+}_x$V$_{1-x}$O$_2$ (M$^{3+}$= Ga$^{3+}$, Al$^{3+}$) single crystals at temperatures below the T $\to$ M2 phase transition | The phase diagram of VO$_2$ strained or doped with several trivalent ions
consists of four phases; in order of increasing temperatures, three (M1, T and
M2) are insulating while the fourth (R), above ~340 K, is metallic. These
phases and the three phase transitions have been thoroughly investigated for
about half a cen... | 2403.01808v2 |
2017-07-27 | Experimental study of electron and phonon dynamics in nanoscale materials by ultrafast laser time-domain spectroscopy | With the rapid advances in the development of nanotechnology, nowadays, the
sizes of elementary unit, i.e. transistor, of micro- and nanoelectronic devices
are well deep into nanoscale. For the pursuit of cheaper and faster nanoscale
electronic devices, the size of transistors keeps scaling down. As the
miniaturization... | 1707.08698v2 |
2002-10-17 | New heat treatment to prepare high quality polycrystalline and single crystal MgB2 in single process | We report here on a new heat treatment to prepare both dense polycrystalline
and single crystal MgB2 high quality samples in one single process. Resistivity
measurements for polycrystalline part of the sample gives a residual
resistivity ratio RRR=16.6 and a very low normal state resistivity rho(40K)=
0.28 microOhmcm. ... | 0210384v1 |
2010-05-03 | Overview of the DHCAL Project | We review the status and plans of the Digital Hadron Calorimeter with
Resistive Plate Chambers project. | 1005.0412v1 |
2010-08-26 | Simulation of Edge Localised Modes using BOUT++ | The BOUT++ code is used to simulate ELMs in a shifted circle equilibrium.
Reduced ideal MHD simulations are first benchmarked against the linear ideal
MHD code ELITE, showing good agreement. Diamagnetic drift effects are included
finding the expected suppression of high toroidal mode number modes. Nonlinear
simulations... | 1008.4554v1 |
2021-05-24 | Ageing studies of Multi-Strip Multi-Gap Resistive Plate Counters based on low resistivity glass electrodes in high irradiation dose | Detailed tests and analysis of ageing effects of high irradiation dose on
Multi-Strip Multi-Gap Resistive Plate Counters based on low resistivity glass
electrodes were performed. MSMGRPC efficiency and cluster size before
irradiation are measured and compared with their values after irradiation in a
high irradiation do... | 2105.12214v2 |
2021-11-23 | Superconducting aluminum heat switch with 3 n$Ω$ equivalent resistance | Superconducting heat switches with extremely low normal state resistances are
needed for constructing continuous nuclear demagnetization refrigerators with
high cooling power. Aluminum is a suitable superconductor for the heat switch
because of its high Debye temperature and its commercial availability in high
purity. ... | 2111.11896v2 |
2023-02-18 | Search for universal minimum drag resistance underwater vehicle hull using CFD | In Autonomous Underwater Vehicles (AUVs) design, hull resistance is an
important factor in determining the power requirements and range of vehicle and
consequently affect battery size, weight, and volume requirement of the design.
In this paper, we leverage on AI-based optimization algorithm along with
Computational Fl... | 2302.09441v2 |
2019-11-22 | Radiation Damage Studies on Titanium Alloys as High Intensity Proton Accelerator Beam Window Materials | A high-strength dual alpha+beta phase titanium alloy Ti-6Al-4V is utilized as
a material for beam windows in several accelerator target facilities. However,
relatively little is known about how material properties of this alloy are
affected by high-intensity proton beam irradiation. With plans to upgrade
neutrino facil... | 1911.10198v1 |
2023-09-26 | The $p_0$-Laplace "Signature" for Quasilinear Inverse Problems | This paper refers to an imaging problem in the presence of nonlinear
materials. Specifically, the problem we address falls within the framework of
Electrical Resistance Tomography and involves two different materials, one or
both of which are nonlinear. Tomography with nonlinear materials in the early
stages of develop... | 2309.15865v2 |
1996-11-30 | Exchange coupling and current-perpendicular-to-plane giant magneto-resistance of magnetic trilayers. Rigorous results within a tight-binding single-band model | It is shown that the current-perpendicular-to-plane giant magneto-resistance
(CPP-GMR) oscillations, in the ballistic regime, are strongly correlated with
those of the exchange coupling (J). Both the GMR and J are treated on equal
footing within a rigorously solvable tight-binding single-band model. The
strong correlat... | 9612008v1 |
1998-09-30 | Thickness dependent magnetotransport in ultra-thin manganite films | To understand the near-interface magnetism in manganites, uniform, ultra-thin
films of La_{0.67}Sr_{0.33}MnO_3 were grown epitaxially on single crystal (001)
LaAlO_3 and (110) NdGaO_3 substrates. The temperature and magnetic field
dependent film resistance is used to probe the film's structural and magnetic
properties.... | 9809414v1 |
1999-10-14 | Giant 1/f noise in perovskite manganites: evidence of the percolation threshold | We discovered an unprecedented magnitude of the 1/f noise near the Curie
temperature Tc in low-Tc manganites. The scaling behavior of the 1/f noise and
the resistance provides strong evidence of the percolation nature of the
ferromagnetic transition in the polycrystalline samples. The step-like changes
of the resistanc... | 9910220v1 |
2000-01-12 | Anomalous Hopping Exponents of Ultrathin Films of Metals | The temperature dependence of the resistance R(T) of ultrathin
quench-condensed films of Ag, Bi, Pb and Pd has been investigated. In the most
resistive films, R(T)=Roexp(To/T)^x, where x=0.75. Surprisingly, the exponent x
was found to be constant for a wide range of Ro and To in all four materials,
possibly implying a ... | 0001162v1 |
2000-07-03 | The mean free path for electron conduction in metallic fullerenes | We calculate the electrical resistivity due to electron-phonon scattering for
a model of A3C60 (A= K, Rb), using an essentially exact quantum Monte-Carlo
calculation. In agreement with experiment, we obtain exceptionally large
metallic resistivities at large temperatures T. This illustrates that the
apparent mean free ... | 0007024v1 |
2000-09-04 | Observation of anomalous single-magnon scattering in half-metallic ferromagnets by chemical pressure control | Temperature variation of resistivity and specific heat have been measured for
prototypical half-metallic ferromagnets,
R_0.6Sr_0.4MnO_3, with controlling the one-electron bandwidth W. We have
found variation of the temperature scalings in the resistivity from
T^2 (R = La, and Nd) to T^3 (R = Sm), and have interpret... | 0009035v1 |
2000-10-25 | Ca0.85Sm0.15MnO3: A mixed antiferromagnet with unusual properties | We investigated electrical and magnetic properties of the electron-doped
manganites Ca1-xSmxMnO3 (0<x<0.2). Our results indicate the possibility of
phase separation in electron doped manganites. The compounds with x = 0.13-0.15
show unusual difference between zero-field cooled and field-cooled
resistivities which are n... | 0010384v1 |
2001-08-21 | Metals with Small Electron Mean-Free Path: Saturation versus Escalation of Resistivity | Resistivity of metals is commonly observed either to 'escalate' beyond the
Ioffe-Regel limit (mean free path l equal to lattice constant a) or to
'saturate' at this point. It is argued that neither behavior is
well-understood, and that 'escalation' is not necessarily more mysterious than
'saturation.' | 0108343v2 |
2002-02-18 | Conductivity Oscillations in Current-Induced Metastable States in Low-Doped Manganite Single Crystals | Deterministic oscillations of current-induced metastable resistivity in
changing voltage have been detected in La$_{0.82}$Ca$_{0.18}$MnO$_3$ single
crystals. At low temperatures, below the Curie point, application of specific
bias procedures switches the crystal into metastable resistivity state
characterized by appear... | 0202284v1 |
2002-02-20 | Universal transport in 2D granular superconductors | The transport properties of quench condensed granular superconductors are
presented and analyzed. These systems exhibit transitions from insulating to
superconducting behavior as a function of inter-grain spacing.
Superconductivity is characterized by broad transitions in which the resistance
drops exponentially with r... | 0202342v1 |
2002-05-22 | Universal angular magnetoresistance and spin torque in ferromagnetic/normal metal hybrids | The electrical resistance of ferromagnetic/normal-metal (F/N)
heterostructures depends on the nature of the junctions which may be tunnel
barriers, point contacts, or intermetallic interfaces. For all junction types,
the resistance of disordered F/N/F perpendicular spin valves as a function of
the angle between magneti... | 0205453v1 |
2002-08-22 | A scheme for electrical detection of spin resonance signal from a single electron trap | We study a scheme for electrical detection of the spin resonance (ESR) of a
single electron trapped near a Field Effect Transistor (FET) conduction
channel. In this scheme, the resonant Rabi oscillations of the trapped electron
spin cause a modification of the average occupancy of a shallow trap, which can
be detected ... | 0208438v1 |
2003-02-20 | Electron scattering near an itinerant to localized electronic transition | We report an unconventional temperature dependence of the resistivity in
several strongly correlated systems approaching a localized to itinerant
electronic transition from the itinerant electron side. The observed
resistivity, proportioanl to T^(3/2)over the entire range of materials
discussed, cannot be explained wit... | 0302426v1 |
2003-03-10 | New collective zero-resistance states in GaAs/AlGaAs heterostructures | Exponentially small resistance in crossed static magnetic and microwave
fields occurs in ultrapure two dimensional electron gases (2DEG), while in less
pure systems the magnetoresistance oscillates but is always positive. A
non-perturbative theory of self-organization explains the new collective states
in terms of open... | 0303181v1 |
2003-04-04 | Co-ordination between Rashba spin-orbital interaction and space charge effect and enhanced spin injection into semiconductors | We consider the effect of the Rashba spin-orbital interaction and space
charge in a ferromagnet-insulator/semiconductor/insulator-ferromagnet junction
where the spin current is severely affected by the doping, band structure and
charge screening in the semiconductor. In diffusion region, if the the
resistance of the tu... | 0304117v1 |
2003-07-17 | Electron interaction with domain walls in antiferromagnetically coupled multilayers | For antiferromagnetically coupled Fe/Cr multilayers the low field
contribution to the resistivity, which is caused by the domain walls, is
strongly enhanced at low temperatures. The low temperature resistivity varies
according to a power law with the exponent about 0.7 to 1. This behavior can
not be explained assuming ... | 0307414v1 |
2004-01-16 | Break-Junction Tunneling Spectroscopy for Doped Semiconductors in the Hopping Regime | We present a theory for tunneling spectroscopy in a break-junction
semiconductor device for materials in which the electronic conduction mechanism
is hopping transport. Starting from the conventional expression for the hopping
current we develop an expression for the break-junction tunnel current for the
case in which ... | 0401282v1 |
2004-02-05 | Resistivity model for both paramagnetic and ferromagnetic phases | The resistivity, $\rho$ as a function of temperature and ionization energy
(doping) and magnetization respectively is derived with further confinements
from spin-disorder scattering. The computed $T_{crossover}$ below $T_C$ and
carrier density in Ga$_{1-x}$Mn$_x$As system are 8-12 K and 10$^{19}$
cm$^{-3}$, remarkably ... | 0402153v5 |
2004-05-26 | The steady state in noncollinear magnetic multilayers | There are at least two different putative steady state solutions for current
across noncollinear magnetic multilayers; one has a discontinuity in the spin
current at the interface the other is continuous. We compare the resistance of
the two and find the solution with the continuous spin currents is lower. By
using the... | 0405624v1 |
2004-06-09 | Negative Magnetoresistance in (In,Mn)As | The magnetotransport properties of an In0.95Mn0.05As thin film grown by
metal-organic vapor phase epitaxy were measured. Resistivity was measured over
the temperature range of 5 to 300 K. The resistivity decreased with increasing
temperature from 90 ohm-cm to 0.05 ohm-cm. The field dependence of the low
temperature mag... | 0406230v1 |
2004-06-21 | Large negative magnetoresistance in thiospinel CuCrZrS4 | We report on large negative magnetoresistance observed in ferromagnetic
thiospinel compound CuCrZrS$_{4}$. Electrical resistivity increased with
decreasing temperature according to the form proportional to
$\textrm{exp}(T_{0}/T)^{1/2} $, derived from variable range hopping with strong
electron-electron interaction. Res... | 0406459v1 |
2004-08-27 | Disorder-Induced Resistive Anomaly Near Ferromagnetic Phase Transitions | We show that the resistivity rho(T) of disordered ferromagnets near, and
above, the Curie temperature T_c generically exhibits a stronger anomaly than
the scaling-based Fisher-Langer prediction. Treating transport beyond the
Boltzmann description, we find that within mean-field theory, d\rho/dT exhibits
a |T-T_c|^{-1/2... | 0408602v2 |
2004-10-07 | Negative differential thermal resistance and thermal transistor | We report on the first model of a thermal transistor to control heat flow.
Like its electronic counterpart, our thermal transistor is a three-terminal
device with the important feature that the current through the two terminals
can be controlled by small changes in the temperature or in the current through
the third te... | 0410172v2 |
2004-11-23 | Current perpendicular to plane Giant Magnetoresistance (GMR) in laminated nanostructures | We theoretically studied spin dependent electron transport
perpendicular-to-plain (CPP) in magnetic laminated multilayered structures by
using Kubo formalism. We took into account not only bulk scattering, but the
interface resistance due to both specular and diffuse reflection and also spin
conserving and spin-flip pr... | 0411571v1 |
2004-12-08 | Ageing effects around the glass and melting transitions in poly(dimethylsiloxane) visualized by resistance measurements | The process of ageing in rubbers requires monitoring over long periods (days
to years). To do so in non-conducting rubbers, small amounts of carbon-black
particles were dispersed in a fractal network through the rubber matrix, to
make the rubber conducting without modifying its properties. Continuous
monitoring of the ... | 0412187v1 |
2005-04-19 | Enhancement of low field magnetoresistance at room temperature in La$_{0.67}$Sr$_{0.33}$MnO$_{3}$/Al$_{2}$O$_{3}$ nanocomposite | Magnetotransport properties in a nanocrystalline
La$_{0.67}$Sr$_{0.33}$MnO$_{3}$/micron sized Al$_{2}$O$_{3}$ granular composite
with different concentrations of Al$_{2}$O$_{3}$ have been studied. The
resistivity curves in absence of magnetic field and the various transport
mechanisms which might account for the upturn... | 0504469v1 |
2005-09-09 | Negative differential resistance in single crystal La_{2}CuO_{4} at low temperature | A current-controlled negative differential resistance has been revealed in
the I-V characteristics of single crystal La$_{2}$CuO$_{4+\delta}$ in the low
temperature region. The non-linear behavior of conductivity is accompanied by a
transition from positive to negative magnetoresistance when the current is
growing. Pos... | 0509247v1 |
2005-11-02 | Current-induced vortex displacement and annihilation in a single Permalloy disk | The induced motion of a magnetic vortex in a micron-sized ferromagnetic disk
due to the DC current injection is studied by measuring planar Hall effect. The
DC current injection is found to induce the spin torque that sweeps the vortex
out of the disk at the critical current while bias magnetic field are applied.
The c... | 0511040v1 |
2006-01-20 | Domain-wall resistance in ferromagnetic (Ga,Mn)As | A series of microstructures designed to pin domain-walls (DWs) in (Ga,Mn)As
with perpendicular magnetic anisotropy has been employed to determine extrinsic
and intrinsic contributions to DW resistance. The former is explained
quantitatively as resulting from a polarity change in the Hall electric field
at DW. The latte... | 0601464v1 |
2006-01-25 | Single-ion Kondo behavior of a novel Kondo lattice, CeNi9Si4 | The compound, CeNi9Si4 has been recently reported to be an unusual Kondo
lattice with a large Ce-Ce separation, with a breakdown of Kadowaki-Woods
relationship governing low temperature electrical resistivity and
heat-capacity. Here we report the results of magnetic susceptibility,
heat-capacity and electrical resistiv... | 0601577v1 |
2006-05-12 | Large domain wall resistance in self-organised manganite film | The electrical resistance of magnetic domain walls in ferromagnetic metallic
manganites can be enhanced to 10-12 Ohm.m2 by patterning nanoconstrictions [J.
Appl. Phys. 89, 6955 (2001)]. We show equally large enhancements in a phase
separated La0.60Ca0.40MnO3 manganite film without recourse to nanopatterning.
The domain... | 0605341v2 |
2006-06-18 | Cotunneling and one-dimensional localization in individual single-wall carbon nanotubes | We report on the temperature dependence of the intrinsic resistance of long
individual disordered single-wall carbon nanotubes. The resistance grows
dramatically as the temperature is reduced, and the functional form is
consistent with an activated behavior. These results are described by Coulomb
blockade along a serie... | 0606473v1 |
2006-10-10 | Nanofabrication of spin-transfer torque devices by a PMMA mask one step process: GMR versus single layer devices | We present a method to prepare magnetic spin torque devices of low specific
resistance in a one step lithography process. The quality of the pillar devices
is demonstrated for a standard magnetic double layer device. For single layer
devices, we found hysteretic switching and a more complex dynamical excitation
pattern... | 0610277v1 |
2006-11-27 | Complete stabilization and improvement of the characteristics of tunnel junctions by thermal annealing | We have observed that submicron sized Al--AlO{$_x$}--Al tunnel junctions can
be stabilized completely by annealing them in vacuum at temperatures between
$350^{\circ}$C and $450^{\circ}$C. In addition, low temperature
characterization of the samples after the annealing treatment showed a marked
improvement of the tunne... | 0611664v1 |
2007-01-17 | Theory of Spin Transport Across Domain-Walls in (Ga,Mn)As | We present results of numerical calculations of domain-wall resistance in the
ferromagnetic semiconductor (Ga,Mn)As. We employ Landauer-Buttiker formalism
and the tight binding method. Taking into account the full valence band
structure we predict the magnitude of the domain-wall resistance without
disorder and compare... | 0701398v1 |
2007-06-01 | Treatment of electron viscosity in quantum conductance | In a recent paper Sai {\it et al.} [1] identified a correction $R^{dyn}$ to
the DC conductance of nanoscale junctions arising from dynamical
exchange-correlation ($XC$) effects within time-dependent density functional
theory. This quantity contributes to the total resistance through
$R=R_{s}+R^{dyn}$ where $R_{s}$ is t... | 0706.0140v1 |
2007-07-05 | Observation of a uniform temperature dependence in the electrical resistance across the structural phase transition in thin film vanadium oxide ($VO_{2}$) | An electrical study of thin $VO_{2}$ films in the vicinity of the structural
phase transition at $68^{0}C$ shows (a) that the electrical resistance $R$
follows $log (R)$ $\propto$ $-T$ over the $T$-range, $20 < T < 80 ^{0}C$
covering both sides of the structural transition, and (b) a history dependent
hysteresis loop i... | 0707.0885v1 |
2007-08-07 | Nonlinear screening and ballistic transport in a graphene p-n junction | We study the charge density distribution, the electric field profile, and the
resistance of an electrostatically created lateral p-n junction in graphene. We
show that the electric field at the interface of the electron and hole regions
is strongly enhanced due to limited screening capacity of Dirac quasiparticles.
Acc... | 0708.0892v2 |
2007-08-22 | Voltage and temperature dependencies of conductivity in gated graphene | The resistivity of gated graphene is studied taking into account electron and
hole scattering by short- and long-range structural imperfections the
characteristics of disorder were taken from the scanning tunneling microscopy
data and by acoustic phonons. The calculations are based on the quasiclassical
kinetic equatio... | 0708.2976v2 |
2007-09-12 | Design issues of a variable thermal resistance | Some years ago we have proposed a thermal mount with electronically variable
thermal resistance [1]. In this earlier work the feasibility of such a
structure has been demonstrated. Now we intend to realize this mount in a
maturated form, suitable to the everyday use in the practice of package thermal
qualification and ... | 0709.1836v1 |
2007-11-29 | Quantum size effects in solitary wires of bismuth | We have performed four-probe electrical transport measurements on solitary
highly crystalline wires of semimetallic bismuth with aspect ratios up to 60 at
room and at cryogenic temperatures. By proper choice of the substrate material
and the film deposition parameters, lithographic wires with lateral dimensions
of down... | 0711.4816v1 |
2008-02-15 | Non-intrinsic superconductivity in InN epilayers: role of Indium Oxide | In recent years there have been reports of anomalous electrical resistivity
and the presence of superconductivity in semiconducting InN layers. By a
careful correlation of the temperature dependence of resistivity and magnetic
susceptibility with structural information from highresolution x-ray
diffraction measurements... | 0802.2126v1 |
2008-03-26 | Quasi-Two-Dimensional Extraordinary Hall Effect | Quasi-two-dimensional transport is investigated in a system consisting of one
ferromagnetic layer placed between two insulating layers. Using the mechanism
of skew-scattering to describe the Extraordinary Hall Effect (EHE) and
calculating the conductivity tensor, we compare the quasi- two-dimensional Hall
resistance wi... | 0803.3649v2 |
2008-04-17 | Conductivity behavior of La$_{0.75}$Ca$_{0.25}$MnO$_{3}$ in vicinity of ferromagnetic-paramagnetic transition studied with single current pulses | Temperature and current dependences of resistivity of bulk
La$_{0.75}$Ca$_{0.25}$MnO$_{3}$ sample grown by the floating-zone method were
studied using single ramp pulses of current. It is found that near the Curie
temperature $T_C$ the sample resistance depends substantially on current
magnitude. The observed features ... | 0804.2806v1 |
2008-05-13 | Temperature dependent transport in suspended graphene | The resistivity of ultra-clean suspended graphene is strongly temperature
dependent for 5K<T<240K. At T~5K transport is near-ballistic in a device of
~2um dimension and a mobility ~170,000 cm^2/Vs. At large carrier density,
n>0.5*10^11 cm^-2, the resistivity increases with increasing T and is linear
above 50K, suggesti... | 0805.1830v1 |
2008-06-20 | Effective Resistance Mismatch and Magnetoresistance of a CPP-GMR system with Current-Confined-Paths | We theoretically study the magnetoresistance of a CPP-GMR system with current
confined paths (CCP) in the framework of Valet-Fert theory. The continuity
equations for charge and spin currents are numerically solved with the
three-dimensional CCP geometry by use of finite element method. It is confirmed
that the MR rati... | 0806.3314v1 |
2008-06-26 | Negative differential resistance in molecular junctions: The effect of the electrodes electronic structure | We have carried out calculations of electron transport through a
metal-molecule-metal junction with metal nanoclusters taking the part of
electrodes. We show that negative differential resistance peaks could appear in
the current-voltage curves. The peaks arise due to narrow features in the
electron density of states o... | 0806.4397v2 |
2008-10-07 | Huge anisotropic magneto-resistance in iridium atomic chains | We analyze in this article the magneto-resistance ratio of finite and
infinite iridium and platinum chains. Our calculations, that are based on a
combination of non equilibrium Green function techniques and density functional
theory, include a fully self-consistent treatment of non-collinear magnetism
and of the spin-o... | 0810.1170v1 |
2008-10-22 | Itinerant Ferromagnetism in the electronic localization limit | We present Hall effect, $R_{xy}(H)$, and magnetoresistance, $R_{xx}(H)$,
measurements of ultrathin films of Ni, Co and Fe with thicknesses varying
between 0.2-8 nm and resistances between 1 M$\Omega$ - 100 $\Omega.$ Both
measurements show that films having resistance above a critical value, $R_{C}$,
(thickness below a ... | 0810.4081v2 |
2008-11-06 | Connectivity and Critical Currents in Polycrystalline MgB2 | Current transport in polycrystalline magnesium diboride is highly non-uniform
(percolative) due to the presence of secondary phases and also due to the
intrinsic anisotropy of the material. The influence of secondary phases on the
transport properties of MgB2 was investigated. Bulk samples were prepared from
a mixture ... | 0811.0986v1 |
2008-12-02 | Independent magnetization behavior of a ferromagnetic metal/semiconductor hybrid system | We report the discovery of an effect where two ferromagnetic materials, one
semiconductor ((Ga,Mn)As) and one metal (permalloy), can be directly deposited
on each other and still switch their magnetization independently. We use this
independent magnetization behavior to create various resistance states
dependent on the... | 0812.0455v1 |
2009-03-31 | Proper Scaling of the Anomalous Hall Effect | Working with epitaxial films of Fe, we succeeded in independent control of
different scattering processes in the anomalous Hall effect. The result
appropriately accounted for the role of phonons, thereby clearly exposing the
fundamental flaws of the standard plot of the anomalous Hall resistivity versus
longitudinal re... | 0903.5360v1 |
2009-04-08 | Negative differential resistance in nanoscale transport in the Coulomb blockade | Motivated by recent experiments, we have studied transport behavior of
coupled quantum dot systems in the Coulomb blockade regime using the master
(rate) equation approach. We explore how electron-electron interactions in a
donor-acceptor system, resembling weakly coupled quantum dots with varying
charging energy, can ... | 0904.1335v1 |
2009-05-18 | On the origin of the electric carrier concentration in graphite | We investigate the dependence of the electrical resistivity of $\sim 60 $nm
thick single crystalline graphite samples on the defect concentration produced
by proton irradiation at very low fluences. We show that the resistivity
decreases few percent at room temperature after inducing defects at
concentrations as low as... | 0905.2945v2 |
2009-06-18 | Temperature-dependent resistivity of ferromagnetic GaMnAs: Interplay between impurity scattering and many-body effects | The static conductivity of the dilute magnetic semiconductor GaMnAs is
calculated using the memory function formalism and time-dependent
density-functional theory to account for impurity scattering and to treat
Hartree and exchange interactions within the hole gas. We find that the Coulomb
scattering off the charged im... | 0906.3526v1 |
2009-09-11 | Kinetic Friction by a Small Number of Intervening Inelastic Particles between Rough Surfaces | We investigate a mechanism of the appearance of kinetic friction in granular
materials. We consider a small number of intervening inelastic particles
between two rough surfaces as one of the simplest dynamical models to study
granular friction. The resistance force applied to the upper surface is
numerically calculated... | 0909.2132v1 |
2009-10-13 | Superconductivity of FeSe0.5Te0.5 Thin Films Grown by Pulsed Laser Deposition | FeSe0.5Te0.5 thin films with PbO-type structure are successfully grown on
MgO(100) and LaSrAlO4(001) substrates from FeSe0.5Te0.5 or FeSe0.5Te0.75
polycrystalline targets by pulsed-laser deposition. The film deposited on the
MgO substrate (film thickness ~ 55 nm) shows superconductivity at 10.6 K
(onset) and 9.2 K (zer... | 0910.2301v1 |
2010-01-25 | Evidence for effective thermal boundary resistance from magnon/phonon disequilibrium | We use the time-resolved magneto-optical Kerr effect (TRMOKE) to measure the
local temperature and heat flow dynamics in ferromagnetic SrRuO3 thin films.
After heating by a pump pulse, the film temperature decays exponentially,
indicating that the heat flow out of the film is limited by the film/substrate
interface. We... | 1001.4557v1 |
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