publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
|---|---|---|---|
2014-06-24 | The Origin of the X-ray Emission from the High-velocity Cloud MS30.7-81.4-118 | A soft X-ray enhancement has recently been reported toward the high-velocity
cloud MS30.7-81.4-118 (MS30.7), a constituent of the Magellanic Stream. In
order to investigate the origin of this enhancement, we have analyzed two
overlapping XMM-Newton observations of this cloud. We find that the X-ray
enhancement is $\sim... | 1406.6363v1 |
2015-03-21 | Graphene as a p-type metal for ultimate miniaturization | We report macroscopic sheets of highly conductive bilayer graphene with
exceptionally high hole concentrations of ~ $10^{15}$ $cm^{-2}$ and
unprecedented sheet resistances of 20-25 {\Omega} per square over macroscopic
scales, and obtained in-situ over a thin cushion of molecular oxygen on a
silicon substrate. The elect... | 1503.06253v2 |
2018-04-06 | Antisite pairs suppress the thermal conductivity of BAs | BAs was predicted to have an unusually high thermal conductivity at room
temperature of 2000$\,$Wm$^{-1}$$\,$K$^{-1}$, comparable to that of diamond.
However, the experimentally measured thermal conductivity of BAs single
crystals is an order of magnitude lower. To identify the origin of this large
inconsistency, we in... | 1804.02381v1 |
2019-04-08 | Characterizations of thermal stability and electrical performance of Au-Ni coating on CuCrZr substrate for high vacuum radio-frequency contact application | Radio-frequency (RF) contacts-which are an example of electrical contacts-are
commonly employed on accelerators and nuclear fusion experimental devices. RF
contacts with a current load of 2 kA for steady-state operation were designed
for application to the International Thermonuclear Experimental Reactor (ITER)
device.... | 1907.07236v1 |
2020-07-03 | Enhanced creep performance in a polycrystalline superalloy driven by atomic-scale phase transformation along planar faults | Predicting the mechanical failure of parts in service requires understanding
their deformation behavior, and associated dynamic microstructural evolution up
to the near-atomic scale. Solutes are known to interact with defects generated
by plastic deformation, thereby affecting their displacement throughout the
microstr... | 2007.01676v2 |
2022-03-15 | Flexible terahertz photonic light-cage modules for in-core sensing and high temperature applications | Terahertz (THz) technology is a growing and multi-disciplinary research
field, particularly for sensing and telecommunications. A number of THz
waveguides have emerged over the past years, which are set to complement the
capabilities of existing and bulky free space setups. In most designs however,
the guiding region i... | 2203.08316v1 |
2022-10-21 | Understanding The Reversible Electrodeposition of Al in Low-Cost Room Temperature Molten Salts | Aluminum is the most earth-abundant metal, is trivalent, is inert in ambient
humid air, and has a density approximately four-times that of lithium at room
temperature. These attributes make it an attractive material for
cost-effective, long-duration storage of electrical energy in batteries.
Scientific discoveries in t... | 2210.12131v1 |
2024-01-18 | Spreading of Low-viscosity Ink Filaments Driven by Bath Viscoelasticity in Embedded Printing | Inks deposited in conventional direct ink writing need to be able to support
their own weight and that of the upper layers with minimal deformation to
preserve the structural integrity of the three-dimensional (3D) printed parts.
This constraint limits the range of usable inks to high-viscosity materials.
Embedded prin... | 2401.09684v1 |
2001-10-08 | Structural and electronic properties of the Nb$_4$-cluster compound Ga$_{1.33}$Nb$_4$X$_8$ (X = S, Se) | We report resistivity, thermopower and magnetic susceptibility measurements
on the Nb$_4$-cluster compounds Ga$_{1.33}$Nb$_4$X$_{8}$ (X = S, Se), derived
from vacancy ordered spinels A$_x$T$_4$X$_8$. The cubic selenide phase is
insulating and its resistivity crosses over from $\ln{\rho} \sim T^{-1}$ to
$\sim T^{-1/2}$ ... | 0110155v1 |
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 |
2002-10-29 | Quantum Resistive Behaviors in the Vortex Liquid Regimes at Finite Temperatures | Motivated by a {\it mean field-like} resistive behavior in magnetic fields
commonly seen in various superconducting (SC) cuprates and organics with strong
fluctuation, {\it quantum} SC fluctuation effects on resistive behaviors are
reexamined by putting emphasis on their roles in the so-called {\it thermal}
vortex liqu... | 0210626v5 |
2002-11-22 | Room Temperature Ballistic Conduction in Carbon Nanotubes | Multiwalled carbon nanotubes are shown to be ballistic conductors at room
temperature, with mean free paths of the order of tens of microns. These
experiments follow and extend the original experiments by Frank et al (Science,
280 1744 1998) including in-situ electron microscopy experiments and a detailed
analysis of t... | 0211515v1 |
2006-12-27 | Peculiarities of the transport properties of InMnAs layers, produced by the laser deposition, in strong magnetic fields | Magnetotransport properties of p-InMnAs layers are studied in pulsed magnetic
fields up to 30 T. Samples were prepared by the laser deposition and annealed
by ruby laser pulses. Well annealed samples show p-type conductivity while they
were n-type before the annealing. Surprisingly the anomalous Hall effect
resistance ... | 0612641v1 |
2007-06-28 | Emergence of a flux tube through a partially ionised solar atmosphere | For a magnetic flux tube, or indeed any flux, to emerge into the Solar corona
from the convection zone it must pass through the partially ionised layers of
the lower atmosphere: the photosphere and the chromosphere. In such regions the
ion-neutral collisions lead to an increased resistivity for currents flowing
across ... | 0706.4223v1 |
2010-01-10 | Anomalies of conductivity behavior near the paramagnetic-antiferromagnetic transition in single-crystals La_{2}CuO_{4+δ} | The temperature dependences of resistance, R(T), of two single-crystals
La_{2}CuO_{4+\delta} samples have been studied with the aim to detect a
possible change in the R(T) behavior induced by paramagnetic-antiferromagnetic
(PM-AFM) transition. One of the samples with \delta \lesssim 0.01, was fairly
homogeneous in oxyg... | 1001.1518v1 |
2011-05-07 | Effect of 50 MeV Li3+ irradiation on structural and electrical properties of Mn doped ZnO | The present work aims to study the effect of ion irradiation on structural
and electrical properties and their correlation with the defects in Zn1-xMnxO
type system. Zn1-xMnxO (x = 0.02, 0.04) samples have been synthesized by
solid-state reaction method and have been irradiated with 50 MeV Li3+ ions. The
concomitant ch... | 1105.1414v1 |
2013-01-07 | Disorder-driven carrier transport in atomic layer deposited ZnO thin films | This paper addresses the effect of disorder on the carrier transport
mechanism of atomic layer deposited ZnO thin films as has been investigated by
temperature dependent electrical resistivity measurements in the temperature
range of 4.2K to 300K. Films were grown on (0001) sapphire substrate at
different substrate tem... | 1301.1172v1 |
2014-11-27 | Temperature dependence of electrical and thermal conduction in single silver nanowire | Silver nanowires have great application potential in fields like flexible
electronic devices, solar cells and transparent electrodes. It is critical and
fundamental to study the thermal and electrical transport properties in a
single silver nanowire. In this work, the thermal and electrical transport in
an individual s... | 1411.7659v2 |
2015-09-18 | Evidence for hydrodynamic electron flow in PdCoO$_2$ | Electron transport is conventionally determined by the momentum-relaxing
scattering of electrons by the host solid and its excitations. The electrical
resistance is set by geometrical factors and the resistivity, which is a
microscopic property of the solid. Hydrodynamic fluid flow through channels, in
contrast, is det... | 1509.05691v2 |
2015-10-31 | The influence of system dynamics on the frictional resistance: insights from a discrete model | In order to examine the influence of system dynamics on sliding friction, we
introduce the so-called micro-walking machine. This model consists of a rigid
body with a number of elastic contact spots that is pulled by a constantly
moving base. The system slides with dry friction on a rigid substrate. The
kinematic coupl... | 1511.00162v1 |
2016-05-02 | Interfilament Resistance at 77 K in Striated HTS Coated Conductors | Striating HTS coated conductor (CC) tapes into narrow filaments offers the
possibility of reducing the tapes' magnetization losses without unreasonably
decreasing their current-carrying capability. However, realizing well-separated
striations presents technological challenges, especially if the number of
filaments is l... | 1605.00401v2 |
2016-08-09 | Disorder-sensitive pump-probe measurements on Nd$_{1.83}$Ce$_{0.17}$CuO$_{4\pmδ}$ films | We find an unambiguous relationship between disorder-driven features in the
temperature dependence of the resistance and the behavior, as functions of the
temperature, of the parameters necessary to describe some of the relaxation
processes in the photoinduced differential time-resolved reflectivity of three
samples of... | 1608.03006v1 |
2018-05-10 | Activation Energy of Metastable Amorphous Ge2Sb2Te5 from Room Temperature to Melt | Resistivity of metastable amorphous Ge2Sb2Te5 (GST) measured at device level
show an exponential decline with temperature matching with the steady-state
thin-film resistivity measured at 858 K (melting temperature). This suggests
that the free carrier activation mechanisms form a continuum in a large
temperature scale ... | 1805.04054v1 |
2019-09-17 | Algorithm for Training Neural Networks on Resistive Device Arrays | Hardware architectures composed of resistive cross-point device arrays can
provide significant power and speed benefits for deep neural network training
workloads using stochastic gradient descent (SGD) and backpropagation (BP)
algorithm. The training accuracy on this imminent analog hardware however
strongly depends o... | 1909.07908v1 |
2017-04-13 | Light Induced Electron-Phonon Scattering Mediated Resistive Switching in Nanostructured Nb Thin Film Superconductor | The elemental Nb is mainly investigated for its eminent superconducting
properties. In contrary, we report of a relatively unexplored property, namely,
its superior optoelectronic property in reduced dimension. We demonstrate here
that nanostructured Nb thin films (NNFs), under optical illumination, behave as
room temp... | 1704.04092v1 |
2017-07-05 | Anomalous Hall effect in two-dimensional non-collinear antiferromagnetic semiconductor Cr0.68Se | Cr0.68Se single crystals with two-dimensional (2D) character have been grown,
and the detailed magnetization M(T), electrical transport properties (including
longitudinal resistivity and Hall resistivity and thermal transport ones
(including heat capacity Cp(T) and thermoelectric power (TEP) S(T)) have been
measured. T... | 1707.01252v1 |
2017-07-20 | Stochastic Dynamics of Resistive Switching: Fluctuations Lead to Optimal Particle Number | Resistive switching is one of the foremost candidates for building novel
types of non-volatile random access memories. Any practical implementation of
such a memory cell calls for a strong miniaturization, at which point
fluctuations start playing a role that cannot be neglected. A detailed
understanding of switching m... | 1707.06648v1 |
2018-08-02 | Non-Classical Longitudinal Magneto-Resistance in Anisotropic Black Phosphorus | Resistivity measurements of a few-layer black phosphorus (bP) crystal in
parallel magnetic fields up to 45 T are reported as a function of the angle
between the in-plane field and the source-drain (S-D) axis of the device. The
crystallographic directions of the bP crystal were determined by Raman
spectroscopy, with the... | 1808.00858v2 |
2019-08-12 | The role of graphitic filaments in resistive switching behaviour of amorphous silicon carbide thin films | Resistive switching in amorphous silicon carbide (a-SiC) films deposited by a
single composite target magnetron sputtering process is reported. Switching
performance as a function of thickness of the films (50, 100 and 300 nm) as
well as different top metal electrodes (Cu, Pt and Ag) with the bottom
electrode fixed as ... | 1908.04079v1 |
2018-07-13 | Tuning vortex fluctuations and the resistive transition in superconducting films with a thin overlayer | It is shown that the temperature of the resistive transition $T_r$ of a
superconducting film can be increased by a thin superconducting or normal
overlayer. For instance, deposition of a highly conductive thin overlayer onto
a dirty superconducting film can give rise to an "anti-proximity effect" which
manifests itself... | 1807.04891v1 |
2020-01-02 | Numerical investigation into fracture resistance of bone following adaptation | Bone adapts in response to its mechanical environment. This evolution of bone
density is one of the most important mechanisms for developing fracture
resistance. A finite element framework for simulating bone adaptation, commonly
called bone remodelling, is presented. This is followed by a novel method to
both quantify... | 2001.00647v1 |
2020-06-19 | Contrasting physical properties of the trilayer nickelates Nd$_4$Ni$_3$O$_{10}$ and Nd$_4$Ni$_3$O$_8$ | We report the crystal structures and physical properties of trilayer
nickelates Nd$_4$Ni$_3$O$_{10}$ and Nd$_4$Ni$_3$O$_8$. Measurements of
magnetization and electrical resistivity display contrasting behaviors in the
two compounds. Nd$_4$Ni$_3$O$_{10}$ shows a paramagnetic metallic behavior with
a metal to metal phase... | 2006.10988v1 |
2020-10-13 | How to solve problems in micro- and nanofabrication caused by the emission of electrons and charged metal atoms during e-beam evaporation | We discuss how the emission of electrons and ions during
electron-beam-induced physical vapor deposition can cause problems in micro-
and nanofabrication processes. After giving a short overview of different types
of radiation emitted from an electron-beam (e-beam) evaporator and how the
amount of radiation depends on ... | 2010.06459v2 |
2021-02-17 | Optimization of epitaxial graphene growth for quantum metrology | (See the complete abstract within the thesis in both English and German
versions)
In this thesis, the process conditions of the epitaxial graphene growth
through a socalled polymer-assisted sublimation growth method are minutely
investigated. Atomic force microscopy (AFM) is used to show that the previously
neglected... | 2102.08691v1 |
2021-05-30 | Enhanced electron-phonon coupling in doubly aligned hexagonal boron nitride bilayer graphene heterostructure | The relative twist angle in heterostructures of two-dimensional (2D)
materials with similar lattice constants result in a dramatic alteration of the
electronic properties. Here, we investigate the electrical and magnetotransport
properties in bilayer graphene (BLG) encapsulated between two hexagonal boron
nitride (hBN)... | 2105.14589v1 |
2021-09-01 | Thickness dependent transition from the 1T$^\prime$ to Weyl semimetal phase in ultrathin MoTe$ _{2} $: Electrical transport, Noise and Raman studies | Bulk 1T$^\prime$-MoTe$_2$ shows a structural phase transition from
1T$^\prime$ to Weyl semimetallic (WSM) $ T_{d} $ phase at $\sim$ 240 K. This
phase transition and transport properties in the two phases have not been
investigated on ultra-thin crystals. Here we report electrical transport, $1/f$
noise and Raman studie... | 2109.00504v2 |
2021-10-05 | Carrier transport and performance limit of semi-transparent photovoltaics: CuIn$_{1-x}$Ga$_x$Se$_2$ as a case study | Semi-transparent photovoltaic devices for building integrated applications
have the potential to provide simultaneous power generation and natural light
penetration. CuIn$_{1-x}$Ga$_x$Se$_2$ (CIGS) has been established as a mature
technology for thin-film photovoltaics, however, its potential for
Semi-Transparent Photo... | 2110.02146v1 |
2022-01-11 | Spectral Thermal Spreading Resistance of Wide Bandgap Semiconductors in Ballistic-Diffusive Regime | To develop efficient thermal management strategies for wide bandgap (WBG)
semiconductor devices, it is essential to have a clear understanding of the
heat transport process within the device and accurately predict the junction
temperature. In this paper, we used the phonon Monte Carlo (MC) method with the
phonon disper... | 2201.03788v1 |
2022-03-23 | Improved Gradual Resistive Switching Range and 1000x On/Off Ratio in HfOx RRAM Achieved with a $Ge_2Sb_2Te_5$ Thermal Barrier | Gradual switching between multiple resistance levels is desirable for analog
in-memory computing using resistive random-access memory (RRAM). However, the
filamentary switching of $HfO_x$-based conventional RRAM often yields only two
stable memory states instead of gradual switching between multiple resistance
states. ... | 2203.12190v1 |
2022-05-09 | Reconciling scaling of the optical conductivity of cuprate superconductors with Planckian resistivity and specific heat | Materials tuned to a quantum critical point display universal scaling
properties as a function of temperature $T$ and frequency $\omega$. A
long-standing puzzle regarding cuprate superconductors has been the observed
power-law dependence of optical conductivity with an exponent smaller than one,
in contrast to $T$-line... | 2205.04030v2 |
2022-05-23 | Electrical Resistivity of Polycrystalline Graphene: Effect of Grain-Boundary-Induced Strain Fields | We have revealed the decisive role of grain-boundary-induced strain fields in
electron scattering in polycrystalline graphene. To this end, we have
formulated the model based on Boltzmann transport theory which properly takes
into account the microscopic structure of grain boundaries (GB) as a repeated
sequence of hept... | 2205.11270v1 |
2022-05-31 | Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe$_2$ | Multiple unconventional superconducting phases are suspected to be driven by
magnetic fluctuations in the heavy-fermion paramagnet UTe$_2$, and a challenge
is to identify the signatures of the electronic correlations, including the
magnetic fluctuations, in the bulk physical quantities. Here, we investigate
thoroughly ... | 2205.15789v2 |
2022-06-11 | On the Fermi gas, the Sommerfeld fine structure constant, and the electron-electron scattering in conductors | Electrical energy is considered as a fundamental parameter for inclusion in
Fermi gas theory, in addition to thermal energy. It is argued that electrical
energy can move some electrons to above the Fermi Level, providing free charges
to carry the electrical current, even at absolute zero temperature. The Drude
model, O... | 2206.05393v2 |
2022-06-30 | Antipolar transitions in GaNb$_4$Se$_8$ and GaTa$_4$Se$_8$ | We present dielectric, polarization, resistivity, specific heat, and magnetic
susceptibility data on single crystals of the lacunar spinels GaNb4Se8 and
GaTa4Se8, tetrahedral cluster-based materials with substantial spin-orbit
coupling. We concentrate on the possible occurrence of antipolar order in these
compounds, as... | 2206.15200v2 |
2022-11-16 | Decoupling the Roles of Defects/Impurities and Wrinkles in Thermal Conductivity of Wafer-scale hBN Films | We demonstrate a non-monotonic evolution of thermal conductivity of
large-area hexagonal boron nitride films with thickness. Wrinkles and
defects/impurities are present in these films. Raman spectroscopy, an
optothermal non-contact technique, is employed to probe the temperature and
laser power dependence property of t... | 2211.08683v2 |
2022-11-18 | Magnetotransport induced by anomalous Hall effect | In a magnetic metal, the Hall resistance is generally taken to be the sum of
the ordinary Hall resistance and the anomalous Hall resistance. Here it is
shown that this empirical relation is no longer valid when either the ordinary
Hall angle or the anomalous Hall angle is not small. Using the proper
conductivity relati... | 2211.10222v2 |
2022-12-08 | Theory of the Little-Parks effect in spin-triplet superconductors | The celebrated Little-Parks effect in mesoscopic superconducting rings has
recently gained great attention due to its potential to probe half-quantum
vortices in spin-triplet superconductors. However, despite the large number of
works reporting anomalous Little-Parks measurements attributed to
unconventional supercondu... | 2212.04591v1 |
2023-04-16 | Anomalous and Topological Hall Resistivity in Ta/CoFeB/MgO Magnetic Systems for Neuromorphic Computing Applications | Topologically protected spin textures, such as magnetic skyrmions, have the
potential for dense data storage as well as energy-efficient computing due to
their small size and a low driving current. The evaluation of the writing and
reading of the skyrmion's magnetic and electrical characteristics is a key step
toward t... | 2304.07742v1 |
2023-09-01 | Multilayer Ferromagnetic Spintronic Devices for Neuromorphic Computing Applications | Spintronics has gone through substantial progress due to its applications in
energy-efficient memory, logic and unconventional computing paradigms.
Multilayer ferromagnetic thin films are extensively studied for understanding
the domain wall and skyrmion dynamics. However, most of these studies are
confined to the mate... | 2309.00476v1 |
2024-01-30 | Effect of the Sc/Zr ratio on the corrosion resistance of Al-Mg cast alloys | The results of investigations of the corrosion resistance of Al-Mg-Sc-Zr
alloys with varying Mg content and different Sc/Zr ratios are presented. The
objects of investigations were the Al-Mg-Sc-Zr alloys with total Sc + Zr
content of 0.32 wt%. The concentration of Sc and Zr in the alloys varied with
the increments of 0... | 2401.17429v1 |
1997-02-27 | High temperature anomaly of the conductance of a tunnel junction | The linear conductance of a tunnel junction in series with an ohmic resistor
is determined in the high temperature limit. The tunneling current is treated
nonperturbatively by means of path integral techniques. Due to quantum effects
the conductance is smaller than the classical series conductance. The reduction
factor... | 9702242v3 |
2002-10-11 | High-field side of Superconductor-Insulator Transition | We report the experimental observation of a magnetic-field-tuned
superconductor-insulator transition (SIT) in ultrathin TiN films. The low
temperature transport properties of these films show scaling behavior
consistent with a transition driven by quantum phase fluctuations in
two-dimensional superconductor. The magnet... | 0210250v1 |
2003-11-11 | Nonlocal effects in high energy charged particle beams | Within the framework of the thermal wave model, an investigation is made of
the longitudinal dynamics of high energy charged particle beams. The model
includes the self-consistent interaction between the beam and its surroundings
in terms of a nonlinear coupling impedance, and when resistive as well as
reactive parts a... | 0311139v1 |
2008-11-05 | High-pressure, transport, and thermodynamic properties of CeTe3 | We have performed high-pressure, electrical resistivity, and specific heat
measurements on CeTe3 single crystals. Two magnetic phases with nonparallel
magnetic easy axes were detected in electrical resistivity and specific heat at
low temperatures. We also observed the emergence of an additional phase at high
pressures... | 0811.0792v2 |
2009-07-30 | High order fractional microwave induced resistance oscillations in 2D systems | We report on the observation of microwave-induced resistance oscillations
associated with the fractional ratio n/m of the microwave irradiation frequency
to the cyclotron frequency for m up to 8 in a two-dimensional electron system
with high electron density. The features are quenched at high microwave
frequencies inde... | 0907.5315v1 |
2010-11-24 | A spark-resistant bulk-micromegas chamber for high-rate applications | We report on the design and performance of a spark-resistant bulk-micromegas
chamber. The principle of this design lends itself to the construction of
large-area muon chambers for the upgrade of the detectors at the Large Hadron
Collider at CERN for luminosities in excess of 10**34/cm2/s or other high-rate
applications... | 1011.5370v1 |
2012-12-10 | Quantized escape and formation of edge channels at high Landau levels | We present nonlocal resistance measurements in an ultra high mobility two
dimensional electron gas. Our experiments show that even at weak magnetic
fields classical guiding along edges leads to a strong non local resistance on
macroscopic distances. In this high Landau level regime the transport along
edges is dissipat... | 1212.2026v1 |
2019-06-26 | Studies on small charge packet transport in high-resistivity fully-depleted CCDs | In this work, we will present a physical model and measurements of the
transport of small charge packets in the bulk of thick high resistivity CCD
before being collected by the pixel potential wells. A new technique to measure
the lateral spread of the charge as a function of the ionization depth in the
bulk is present... | 1906.11379v1 |
2011-07-09 | Resistance to TB drugs in KwaZulu-Natal: causes and prospects for control | In 2005 there was an outbreak of XDR (extensively drug resistant) TB in
Tugela Ferry, which is served by the Church of Scotland Hospital (COSH), in the
uMzinyathi District, KwaZulu-Natal, South Africa. An investigation was carried
out to determine if XDR TB was occurring elsewhere in the province, and to
develop hypoth... | 1107.1800v1 |
2012-02-06 | Performances of Anode-resistive Micromegas for HL-LHC | Micromegas technology is a promising candidate to replace Atlas forward muon
chambers -tracking and trigger- for future HL-LHC upgrade of the experiment.
The increase on background and pile-up event probability requires detector
performances which are currently under studies in intensive RD activities.
We studied per... | 1202.1074v1 |
2018-11-12 | Phonon-induced giant linear-in-$T$ resistivity in magic angle twisted bilayer graphene: Ordinary strangeness and exotic superconductivity | We study the effect of electron-acoustic phonon interactions in twisted
bilayer graphene on resistivity in the high-temperature transport and
superconductivity in the low-temperature phase diagram. We theoretically show
that twisted bilayer graphene should have an enhanced and strongly twist-angle
dependent linear-in-t... | 1811.04920v4 |
2017-03-07 | A Strange Metal from Gutzwiller correlations in infinite dimensions | Recent progress in extremely correlated Fermi liquid theory (ECFL) and
dynamical mean field theory (DMFT) enables us to compute in the $d \to \infty$
limit the resistivity of the $t-J$ model after setting $J\to0$. This is also
the $U=\infty$ Hubbard model. We study three densities $n=.75,.8,.85$ that
correspond to a ra... | 1703.02206v3 |
2019-07-16 | General relativistic resistive magnetohydrodynamics with robust primitive variable recovery for accretion disk simulations | Recent advances in black hole astrophysics, particularly the first visual
evidence of a supermassive black hole at the center of the galaxy M87 by the
Event Horizon Telescope (EHT), and the detection of an orbiting "hot spot"
nearby the event horizon of Sgr A* in the Galactic center by the Gravity
Collaboration, requir... | 1907.07197v2 |
2020-06-23 | Thermal interfacial resistance and nanolayer effect on the thermal conductivity of Al2O3-CO2 nanofluid: A Molecular Dynamics approach | Nanofluids are known to have significantly different thermal properties
relative to the corresponding conventional fluids. Heat transfer at the
solid-fluid interface affects the thermal properties of nanofluids. The current
work helps in understanding the role of two nanoscale phenomena, namely
ordering of fluid layer ... | 2006.12805v2 |
2022-03-12 | Parameterization of hydrodynamic friction in a model for sheared suspensions of rough particles | We propose a method to parameterize a coarse grained model for the
hydrodynamic friction between nearly touching rough spheres in suspension
flows. The frictional resistance due to surface roughness primarily alters the
sliding and rolling modes of motion of rough particles. Stokesian dynamics
simulations incorporating... | 2203.06300v1 |
2003-11-17 | Collapse of Magnetized Singular Isothermal Toroids: I. Non-Rotating Case | We study numerically the collapse of non-rotating, self-gravitating,
magnetized, singular isothermal toroids characterized by sound speed, $a$, and
level of magnetic to thermal support, $H_0$. In qualitative agreement with
previous treatments by Galli & Shu and other workers, we find that the
infalling material is defl... | 0311376v1 |
2006-02-01 | From Protoplanets to Protolife: The Emergence and Maintenance of Life | Despite great advances in our understanding of the formation of the Solar
System, the evolution of the Earth, and the chemical basis for life, we are not
much closer than the ancient Greeks to an answer of whether life has arisen and
persisted on any other planet. The origin of life as a planetary phenomenon
will proba... | 0602008v1 |
2000-05-10 | Magnetic, thermal, and transport properties on single crystals of antiferromagnetic Kondo-lattice Ce2PdSi3 | Magnetization, heat capacity, electrical resistivity, thermoelectric power,
and Hall effect have been investigated on single-crystalline Ce_2PdSi_3. This
compound is shown to order antiferromagnetically below N'eel temperature (T_N)
\~3 K. The Sommerfeld coefficient far below T_N is found to be about 110 mJ/K^2
mol Ce,... | 0005164v1 |
2001-06-03 | Transport processes in metal-insulator granular layers | The non-equilibrium tunnel transport processes are considered in a square
lattice of metallic nanogranules embedded into insulating host. Based on a
simple model with three possible charging states (+,-, or 0) of a granule and
three kinetic processes (creation or recombination of a +- pair, and charge
transfer) between... | 0106034v2 |
2002-03-06 | Concentration Dependence of Superconductivity and Order-Disorder Transition in the Hexagonal Rubidium Tungsten Bronze RbxWO3. Interfacial and bulk properties | We revisited the problem of the stability of the superconducting state in
RbxWO3 and identified the main causes of the contradictory data previously
published. We have shown that the ordering of the Rb vacancies in the
nonstoichiometric compounds have a major detrimental effect on the
superconducting temperature Tc.The... | 0203120v1 |
2003-04-19 | Transport properties of granular metals at low temperatures | We investigate transport in a granular metallic system at large tunneling
conductance between the grains, $g_T\gg 1$. We show that at low temperatures,
$T\leq g_T\delta $, where $\delta$ is the single mean energy level spacing in a
grain, the coherent electron motion at large distances dominates the physics,
contrary t... | 0304448v1 |
2004-03-31 | Correlation of microwave surface impedance of MgB_2 thin film with material parameters and a temperature niche for microwave applications | Two issues related to the microwave surface impedance Z_s of MgB_2 thin film
are discussed in this Letter, both being significant for potential microwave
applications. At first, a correlation between Zs and Alpha = Xi/l was found,
where Xi is the coherence length, and l is the mean free path. The surface
resistance Rs ... | 0403755v1 |
2004-10-21 | Effect of nanometer-sized B powder on phase formation of polycrystalline MgB2 | The size effect of the raw B powder on the MgB2 phase formation has been
studied by the technique of in-situ high temperature resistivity (HT-rT)
measurement. The onset temperature, Tonset, and the completion temperature,
TPF, of the phase formation are determined directly during the ongoing thermal
process. These two ... | 0410533v1 |
2005-03-18 | Aharonov-Bohm electron interferometer in the integer quantum Hall regime | We report experiments on a quantum electron interferometer fabricated from
high mobility, low density GaAs/AlGaAs heterostructure material. In this
device, a nearly circular electron island is defined by four front gates
deposited in etched trenches. The island is separated from the 2D electron bulk
by two nearly open ... | 0503456v2 |
2006-09-05 | Electrical and Thermal Transport in Metallic Single-Wall Carbon Nanotubes on Insulating Substrates | We analyze transport in metallic single-wall carbon nanotubes (SWNTs) on
insulating substrates over the bias range up to electrical breakdown in air. To
account for Joule self-heating, a temperature-dependent Landauer model for
electrical transport is coupled with the heat conduction equation along the
nanotube. The el... | 0609075v2 |
2009-09-14 | Progress in the development of a S RETGEM-based detector for an early forest fire warning system | In this paper we present a prototype of a Strip Resistive Thick GEM
photosensitive gaseous detector filled with Ne and ethylferrocene vapours at a
total pressure of 1 atm for an early forest fire detection system. Tests show
that it is one hundred times more sensitive than the best commercial
ultraviolet flame detector... | 0909.2480v1 |
2009-09-28 | Hall effect in superconducting Fe(Se0.5Te0.5) thin films | The Hall effect is investigated for eight superconducting Fe(Se_0.5_Te_0.5_)
thin films grown on MgO and LaSrAlO_4_ substrates with different transition
temperatures (T_c_). The normal Hall coefficients (R_H_) have positive values
with magnitude of 1 - 1.5 x 10^-3^ cm^3^/C at room temperature for the all
samples. With ... | 0909.4985v3 |
2010-11-14 | Tunneling anisotropic magnetoresistance of NiFe/IrMn/MgO/Pt stack: An antiferromagnet based spin-valve | Spin-valve is a microelectronic device in which high and low resistance
states are realized by utilizing both charge and spin of carriers. Spin-valve
structures used in modern hard drive read-heads and magnetic random access
memories comprise two ferromagnetic (FM) electrodes whose relative
magnetization orientations c... | 1011.3188v1 |
2011-09-09 | Study of ageing in Al-Mg-Si alloys by positron annihilation spectroscopy | In many common Al-Mg-Si alloys (6000 series) intermediate storage at or near
'room temperature' after solutionising leads to pronounced changes of the
precipitation kinetics during the ensuing artificial ageing step at \approx
180{\deg}C. This is not only an annoyance in production, but also a challenge
for researchers... | 1109.2019v2 |
2012-11-20 | Enhanced superconducting performance of melt quenched Bi2Sr2CaCu2O8 (Bi-2212) superconductor | We scrutinize the enhanced superconducting performance of melt quench Bismuth
based Bi2Sr2CaCu2O8 (Bi-2212) superconductor. The superconducting properties of
melt quenched Bi-2212 (Bi2212-MQ) sample are compared with non-melted Bi2212-NM
and Bi1.4Pb0.6Sr2Ca2Cu3O10 (Bi-2223). Crystal structure and morphology of the
samp... | 1211.4681v2 |
2013-07-27 | Strain-induced effects on the magnetic and electronic properties of epitaxial Fe$_{1-x}$Co$_{x}$Si thin films | We have investigated the Co-doping dependence of the structural, transport,
and magnetic properties of \epsilon-FeCoSi epilayers grown by molecular beam
epitaxy on silicon (111) substrates. Low energy electron diffraction, atomic
force microscopy, X-ray diffraction, and high resolution transmission electron
microscopy ... | 1307.7301v1 |
2013-08-05 | Enhancement of superconductivity near the pressure-induced semiconductor-metal transition in BiS2-based compounds LnO(0.5)F(0.5)BiS2 (Ln = La, Ce, Pr, Nd) | Measurements of electrical resistivity were performed between 3 and 300 K at
various pressures up to 2.8 GPa on the BiS2-based superconductors
LnO0.5F0.5BiS2 (Ln = Pr, Nd). At lower pressures, PrO0.5F0.5BiS2 and
NdO0.5F0.5BiS2 exhibit superconductivity with critical temperatures Tc of 3.5
and3.9 K, respectively. As pre... | 1308.1072v3 |
2014-02-13 | Colloidal pattern replication through contact photolithography operated in a "Talbot-Fabry-Perot" regime | We detail on a continuous colloidal pattern replication by using contact
photolithography. Chrome on quartz masks are fabricated using colloidal
nanosphere lithography and subsequently used as photolithography stamps.
Hexagonal pattern arrangements with different dimensions (980, 620 and 480 nm,
using colloidal particl... | 1402.3117v1 |
2014-02-28 | Exploring of point-contact spectra of Ba1-xNaxFe2As2 in the normal and superconducting state | We present study of derivatives of current-voltage I(V) characteristics of
point-contacts (PCs) based on Ba{1-x}Na{x}Fe2As2 (x=0.25) in the normal and
superconducting state. The detailed analysis of dV/dI(V) data (also given in
Appendix A) shows that the thermal regime, when temperature increases with a
voltage at a ra... | 1402.7233v1 |
2014-03-16 | Electrical Contacts to Three-Dimensional Arrays of Carbon Nanotubes | We use numerical simulations to investigate the properties of metal contacts
to three-dimensional arrays of carbon nanotubes (CNTs). For undoped arrays
top-contacted with high or low work function metals, electrostatic screening is
very strong, resulting in a small Schottky barrier for current injection in the
top laye... | 1403.3942v1 |
2014-06-05 | Giant overlap between the magnetic and superconducting phases of CeAu2Si2 under pressure | High pressure provides a powerful means for exploring unconventional
superconductivity which appears mostly on the border of magnetism. Here we
report the discovery of pressure-induced heavy fermion superconductivity up to
2.5 K in the antiferromanget CeAu2Si2 (TN ~ 10 K). Remarkably, the magnetic and
superconducting p... | 1406.1438v2 |
2014-09-10 | Proximity effects at the interface of a superconductor and a topological insulator in NbN - Bi_2Se_3 thin film bilayers | In a search for a simple proximity system of a topological insulator and a
superconductor for studying the role of surface versus bulk effects by gating,
we report here on a first step toward this goal, namely the choice of such a
system and its characterization. We chose to work with thin film bilayers of
grainy 5 nm ... | 1409.2975v1 |
2015-02-15 | Contact doping, Klein tunneling, and asymmetry of shot noise in suspended graphene | The inherent asymmetry of the electric transport in graphene is attributed to
Klein tunneling across barriers defined by $\textit{pn}$-interfaces between
positively and negatively charged regions. By combining conductance and shot
noise experiments we determine the main characteristics of the tunneling
barrier (height ... | 1502.04330v2 |
2015-10-06 | Spin Hall magnetoresistance as a probe for surface magnetization in Pt/CoFe$_2$O$_4$ bilayers | We study the spin Hall magnetoresistance (SMR) in Pt grown $\textit{in situ}$
on CoFe$_2$O$_4$ (CFO) ferrimagnetic insulating (FMI) films. A careful analysis
of the angle-dependent and field-dependent longitudinal magnetoresistance
indicates that the SMR contains a contribution that does not follow the bulk
magnetizati... | 1510.01449v2 |
2015-11-25 | Quantum oscillations of the topological surface states in low carrier concentration crystals of Bi$_{2-x}$Sb$_{x}$Te$_{3-y}$Se$_{y}$ | We report a high-field magnetotransport study on selected low-carrier
crystals of the topological insulator Bi$_{2-x}$Sb${_x}$Te$_{3-y}$Se$_{y}$.
Monochromatic Shubnikov - de Haas (SdH) oscillations are observed at 4.2~K and
their two-dimensional nature is confirmed by tilting the magnetic field with
respect to the sam... | 1511.08186v1 |
2016-05-06 | Antiferromagnetism in trigonal SrMn2As2 and CaMn2As2 single crystals | Crystallographic, electronic transport, thermal and magnetic properties are
reported for SrMn2As2 and CaMn2As2 single crystals grown using Sn flux.
Rietveld refinements of powder x-ray diffraction data show that the two
compounds are isostructural and crystallize in the trigonal CaAl2Si2-type
structure (space group P-3... | 1605.02052v2 |
2016-06-13 | Observation of Spatial Charge and Spin Correlations in the 2D Fermi-Hubbard Model | Strong electron correlations lie at the origin of transformative phenomena
such as colossal magneto-resistance and high-temperature superconductivity.
Already near room temperature, doped copper oxide materials display remarkable
features such as a pseudo-gap and a "strange metal" phase with unusual
transport propertie... | 1606.04089v1 |
2016-06-24 | Epitaxial graphene homogeneity and quantum Hall effect in millimeter-scale devices | Quantized magnetotransport is observed in 5.6 x 5.6 mm^2 epitaxial graphene
devices, grown using highly constrained sublimation on the Si-face of SiC(0001)
at high temperature (1900 {\deg}C). The precise quantized Hall resistance of
Rxy = h/2e^2 is maintained up to record level of critical current Ixx = 0.72 mA
at T = ... | 1606.07720v1 |
2016-07-11 | The electronic thermal conductivity of graphene | Graphene, as a semimetal with the largest known thermal conductivity, is an
ideal system to study the interplay between electronic and lattice
contributions to thermal transport. While the total electrical and thermal
conductivity have been extensively investigated, a detailed first-principles
study of its electronic t... | 1607.03037v1 |
2016-07-26 | Interface-driven topological Hall effect in SrRuO$_3$-SrIrO$_3$ bilayer | Electron transport coupled with magnetism has attracted attention over the
years as exemplified in anomalous Hall effect due to a Berry phase in momentum
space. Another type of unconventional Hall effect -- topological Hall effect,
originating from the real-space Berry phase, has recently become of great
importance in ... | 1607.07536v1 |
2016-08-25 | Kelvin probe characterization of buried graphitic microchannels in single-crystal diamond | In this work, we present an investigation by Kelvin Probe Microscopy (KPM) of
buried graphitic microchannels fabricated in single-crystal diamond by direct
MeV ion microbeam writing. Metal deposition of variable-thickness masks was
adopted to implant channels with emerging endpoints and high temperature
annealing was p... | 1608.07126v1 |
2016-08-30 | Epitaxial thin films of pyrochlore iridate Bi_{2+x}Ir_{2-y}O_{7-delta}: structure, defects and transport properties | While pyrochlore iridate thin films are theoretically predicted to possess a
variety of emergent topological properties, experimental verification of these
predictions can be obstructed by the challenge in thin film growth. Here we
report on the pulsed laser deposition and characterization of thin films of a
representa... | 1608.08608v3 |
2017-10-04 | Formation, stratification, and mixing of the cores of Earth and Venus | Earth possesses a persistent, internally-generated magnetic field, whereas no
trace of a dynamo has been detected on Venus, at present or in the past,
although a high surface temperature and recent resurfacing events may have
removed paleomagnetic evidence. Whether or not a terrestrial body can sustain
an internally ge... | 1710.01770v1 |
2018-03-30 | Thermodynamics of Ion Separation by Electrosorption | We present a simple, top-down approach for the calculation of minimum energy
consumption of electrosorptive ion separation using variational form of the
(Gibbs) free energy. We focus and expand on the case of electrostatic
capacitive deionization (CDI), and the theoretical framework is independent of
details of the dou... | 1803.11532v1 |
2018-05-22 | Non-saturating large magnetoresistance in semimetals | The rapidly expanding class of quantum materials known as {\emph{topological
semimetals}} (TSM) display unique transport properties, including a striking
dependence of resistivity on applied magnetic field, that are of great interest
for both scientific and technological reasons. However, experimental signatures
that c... | 1805.08797v2 |
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