publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
|---|---|---|---|
2000-03-14 | Magnetic and electrical resistance behaviour of the oxides, Ca$_{3-x}$Y$_x$LiRuO$_6$ (x= 0.0, 0.5 and 1.0) | We have investigated the magnetic and electrical resistance behaviour of
Ca$_{3-x}$Y$_x$LiRuO$_6$. The parent compound exhibits magnetic ordering from
Ru sublattice at a rather high temperature, 113 K. Though the paramagnetic
Curie temperature ($\theta$$_p$) is negative indicative of antiferromagnetic
ordering, the... | 0003227v1 |
2001-03-26 | Superconducting Mg-B films by pulsed laser deposition in an in-situ two-step process using multi-component targets | Superconducting thin films have been prepared in a two-step in-situ process,
using the Mg-B plasma generated by pulsed laser ablation. The target was
composed of a mixture of Mg and MgB2 powders to compensate for the volatility
of Mg and therefore to ensure a high Mg content in the film. The films were
deposited at tem... | 0103543v1 |
2001-05-29 | Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals | Here we report the growth of sub-millimeter MgB2 single crystals of various
shapes under high pressure in Mg-B-N system. Structure refinement using a
single-crystal X-ray diffraction analysis gives lattice parameters a=3.0851(5)
A and c=3.5201(5) A with small reliability factors (Rw =0.025, R=0.018), which
enables us t... | 0105545v2 |
2001-10-18 | Strong Quasiparticle Trapping In A 6x6 Array Of Vanadium-Aluminum Superconducting Tunnel Junctions | A 6x6 array of symmetrical V/Al/AlOx/Al/V Superconducting Tunnel Junctions
(STJs) was fabricated. The base electrode is a high quality epitaxial film with
a residual resistance ratio (RRR) of ~30. The top film is polycrystalline with
an RRR of ~10. The leakage currents of the 25x25 mm^2 junctions are of the
order of 0.... | 0110374v1 |
2001-10-18 | Magnetic and transport properties of the new antiferromagnetic Kondo-lattice CeNiBi2 | We report results of the first studies on the magnetic and transport
properties of a new material CeNiBi_2. The magnetic susceptibility exhibits a
sharp peak at T_N = 6K, indicating an antiferromagnetic phase transition. This
antiferromagnetic order below T_N is confirmed by magnetization measurement,
which displays a ... | 0110380v1 |
2002-03-08 | Strain effect on electronic transport and ferromagnetic transition temperature in La$_{0.9}$Sr$_{0.1}$MnO$_{3}$ thin films | We report on a systematic study of strain effects on the transport properties
and the ferromagnetic transition temperature $T_{c}$ of high-quality
La$_{0.9}$Sr$_{0.1}$MnO$_{3}$ thin films epitaxially grown on (100) SrTiO$_{3}$
substrates. Both the magnetization and the resistivity are critically dependent
on the film t... | 0203196v1 |
2002-04-22 | Role of Umklapp Processes in Conductivity of Doped Two-Leg Ladders | Recent conductivity measurements performed on the hole-doped two-leg ladder
material $\mathrm{Sr_{14-x}Ca_xCu_{24}O_{41}}$ reveal an approximately linear
power law regime in the c-axis DC resistivity as a function of temperature for
$x=11$. In this work, we employ a bosonic model to argue that umklapp processes
are res... | 0204485v1 |
2002-07-02 | Comment to the paper : Collapse of the vortex-lattice inductance and shear modulus at the melting transition in untwinned YBa$_2$Cu$_3$O$_7$, by Matl \QTR{em}{et al.} | In a recent paper, Matl et al present a high-frequency study of the complex
resistivity of a pinned vortex lattice in YBaCuO . They focus on the
inductive-to-resistive transition which is investigated as a function of
temperature at a constant field $B_0=2$ T, so that the transition is associated
with the vanishing of ... | 0207074v1 |
2003-05-21 | Carbon-substituted MgB2 single crystals | Carbon-substituted MgB2 single crystals, Mg(B_1-xC_x)_2 of 0.3-1.0 mm size
were grown for x=0.02-0.15 by a high-pressure technique. The doping dependence
of lattice constants studied in a range of x=0.0-0.2 shows a monotonic decrease
in a, while the c parameter remains almost invariant. Using X-ray diffraction
and Auge... | 0305485v1 |
2003-07-01 | Efficient nonlinear room-temperature spin injection from ferromagnets into semiconductors through a modified Schottky barrier | We suggest a consistent microscopic theory of spin injection from a
ferromagnet (FM) into a semiconductor (S). It describes tunneling and emission
of electrons through modified FM-S Schottky barrier with an ultrathin heavily
doped interfacial S layer . We calculate nonlinear spin-selective properties of
such a reverse-... | 0307030v4 |
2003-12-23 | 1-D Simulation of the Electron Density Distribution in a Novel Nonvolatile Resistive Random Access Memory Device | The operation of a novel nonvolatile memory device based on a conductive
ferroelectric/non-ferroelectric thin film multilayer stack is simulated
numerically. The simulation involves the self-consistent steady state solution
of Poisson's equation and the transport equation for electrons assuming a
Drift-Diffusion transp... | 0312609v1 |
2004-03-08 | Hole mobility in organic single crystals measured by a "flip-crystal" field-effect technique | We report on single crystal high mobility organic field-effect transistors
(OFETs) prepared on prefabricated substrates using a "flip-crystal" approach.
This method minimizes crystal handling and avoids direct processing of the
crystal that may degrade the FET electrical characteristics. A chemical
treatment process fo... | 0403210v1 |
2004-04-11 | Synthesis of as-grown superconducting MgB_2 thin films by molecular beam epitaxy in UHV conditions | As-grown superconducting MgB_2 thin films have been grown on SrTiO_3(001),
MgO(001), and Al_2O_3(0001) substrates by a molecular beam epitaxy (MBE) method
with novel co-evaporation conditions of low deposition rate in ultra-high
vacuum. The structural and physical properties of the films were studied by
RHEED, XRD, ele... | 0404252v1 |
2004-08-20 | Anomalous Hall effect in insulating Ga1-xMnxAs | We have investigated the effect of doping by Te on the anomalous Hall effect
in Ga1-xMnxAs (x = 0.085). For this relatively high value of x the temperature
dependence of resistivity shows an insulating behavior. It is well known that
in Ga1-xMnxAs the Mn ions naturally act as acceptors. Additional doping by Te
donors d... | 0408446v1 |
2005-01-14 | Magnetization and magnetoresistance in insulating phases of SrFeO3-d | We report the synthesis and properties of two new insulating phases of
SrFeO3-d with introduction of oxygen deficiencies in metallic SrFeO3 ; one with
0.15 < d < 0.19 (sample A)and the other above d = 0.19 (sample B). Sample A
shows large negative magnetoresistance around the charged ordering (CO)
temperature with magn... | 0501352v1 |
2005-07-14 | Field-Dependent Hall Effect in Single Crystal Heavy Fermion YbAgGe below 1K | We report the results of a low temperature (T >= 50 mK) and high field (H <=
180 kOe) study of the Hall resistivity in single crystals of YbAgGe, a heavy
fermion compound that demonstrates field-induced non-Fermi-liquid behavior near
its field-induced quantum critical point. Distinct features in the anisotropic,
field-... | 0507338v1 |
2005-10-20 | Stick slip motion in grain grain friction in a humid atmosphere | We set up an original apparatus to measure the grain grain friction stress
inside a granular medium composed of sodo-silicate-glass beads surrounded by a
water vapor atmosphere.We analyze here the influence of the physico chemistry
of water on our glass beads and its consequences on our shear experiment. We
found two s... | 0510532v1 |
2006-06-23 | Electronic transport in Si nanowires: Role of bulk and surface disorder | We calculate the resistance and mean free path in long metallic and
semiconducting silicon nanowires (SiNWs) using two different numerical
approaches: A real space Kubo method and a recursive Green's function method.
We compare the two approaches and find that they are complementary: depending
on the situation a prefer... | 0606600v1 |
2006-07-18 | Dielectric breakdown in underoxidized magnetic tunnel junctions: Dependence on oxidation time and area | Magnetic tunnel junctions (MTJs) with partially oxidized 9 \AA
AlO$_x$-barriers were recently shown to have the necessary characteristics to
be used as magnetoresistive sensors in high-density storage devices. Here we
study dielectric breakdown in such underoxidized magnetic tunnel junctions,
focusing on its dependence... | 0607452v1 |
2007-01-20 | Fabrication and Low Temperature Thermoelectric Properties of Na_xCoO_2 (x = 0.68 and 0.75) Epitaxial Films by the Reactive Solid-Phase Epitaxy | We have fabricated Na_xCoO_2 thin films via lateral diffusion of sodium into
Co_3O_4 (111) epitaxial films (reactive solid-phase epitaxy: Ref. 4). The
environment of thermal diffusion is key to the control of the sodium content in
thin films. From the results of x-ray diffraction and in-plane resistivity, the
epitaxial... | 0701492v1 |
2007-02-05 | Existence of two electronic states in Sr4Ru3O10 at low temperatures | We report measurements on in-plane resistivity, thermopower, and
magnetization as a function of temperature and magnetic fields on single
crystalline Sr4Ru3O10 grown by the floating zone method. As the temperature was
lowered to below around 30 K, the in-plane and c-axis resistivities and the
thermopower were found to ... | 0702093v1 |
2007-05-02 | Comment on ``Collapse of Coherent Quasiparticle States in $θ$-(BEDT-TTF)$_2$I$_3$ Observed by Optical Spectroscopy'' | Recently, Takenaka et al. reported that the resistivity rho(T) of
theta-(BEDT-TTF)_2I_3 (theta-ET) exceeds the Ioffe-Regel resistivity by a
factor of 50 at large temperatures T (``bad metal''). This was ascribed to
strong correlation. We argue that the optical conductivity sigma(omega) implies
that correlation is not v... | 0705.0230v1 |
2007-07-15 | Physical properties of a new cuprate superconductor Pr_2Ba_4Cu_7O_{15-δ} | We present studies of the thermal, magnetic and electrical transport
properties of reduced polycrystalline Pr_2Ba_4Cu_7O_{15-\delta} (Pr247) showing
a superconducting transition at Tc = 10 - 16 K and compare them with those of
as-sintered non-superconducting Pr247. The electrical resistivity in the normal
state exhibit... | 0707.2180v1 |
2007-07-30 | Intrinsic tunneling in phase separated manganites | We present evidence of direct electron tunneling across intrinsic insulating
regions in sub-micrometer wide bridges of the phase separated ferromagnet
(La,Pr,Ca)MnO$_3$. Upon cooling below the Curie temperature, a predominantly
ferromagnetic supercooled state persists where tunneling across the intrinsic
tunnel barrier... | 0707.4411v2 |
2008-01-09 | Impact of in-plane currents on magnetoresistance properties of an exchange-biased spin-valve with insulating antiferromagnetic layer | The impact of in-plane alternating currents on the exchange bias, resistance,
and magnetoresistance of a CoFe/NiCoO/CoFe/Cu/CoFe spin-valve is studied. With
increasing current, the resistance is increased while the maximum
magnetoresistance ratio decreases. Noticeably, the reversal of the pinned layer
is systematically... | 0801.1515v1 |
2008-04-09 | Curie point singularity in the temperature derivative of resistivity in (Ga,Mn)As | We observe a singularity in the temperature derivative $d\rho/dT$ of
resistivity at the Curie point of high-quality (Ga,Mn)As ferromagnetic
semiconductors with $T_c$'s ranging from approximately 80 to 185 K. The
character of the anomaly is sharply distinct from the critical contribution to
transport in conventional den... | 0804.1578v2 |
2008-06-24 | Low temperature thermal resistance for a new design of silver sinter heat exchanger | We have developed a novel procedure for constructing high surface area silver
sinter heat exchangers. Our recipe incorporates nylon fibers having a diameter
of ~ 50 microns and thin wires of bulk silver in the heat exchanger. In order
to increase the thermal conductance of liquid helium within the heat exchanger,
prior... | 0806.3930v1 |
2008-08-09 | Transport and Magnetic properties of Fe1/3VSe2 | Electrical conductivity, thermopower and magnetic properties of
Fe-intercalated Fe0.33VSe2 has been reported between 4.2K - 300K. We observe a
first order transition in the resistivity of the sintered pellets around 160K
on cooling. The electronic properties including the transitional hysteresis in
the resistance anoma... | 0808.1334v1 |
2008-08-28 | Giant frictional drag in strongly interacting bilayers near filling factor one | We study the frictional drag in high mobility, strongly interacting GaAs
bilayer hole systems in the vicinity of the filling factor $\nu=1$ quantum Hall
state (QHS), at the same fillings where the bilayer resistivity displays a
reentrant insulating phase. Our measurements reveal a very large longitudinal
drag resistivi... | 0808.3807v1 |
2008-10-26 | Development of Glass Resistive Plate Chambers for INO | The India-based Neutrino Observatory (INO) collaboration is planning to build
a massive 50kton magnetised Iron Calorimeter (ICAL) detector, to study
atmospheric neutrinos and to make precision measurements of the parameters
related to neutrino oscillations. Glass Resistive Plate Chambers (RPCs) of
about 2m X 2m in size... | 0810.4693v1 |
2009-02-01 | Enhancement of positive magnetoresistance following a magnetic-field-induced ferromagnetic transition in an intermetallic compound, Tb5Si3 | We report the existence of a field-induced ferromagnetic transition in the
magnetically ordered state (<69 K) of an intermetallic compound, Tb5Si3, and
this transition is distinctly first-order at 1.8 K (near 60 kOe), whereas it
appears to become second order near 20 K. The finding we stress is that the
electrical resi... | 0902.0153v1 |
2009-06-08 | Tunneling Electroresistance in Ferroelectric Tunnel Junctions with a Composite Barrier | Tunneling electroresistance (TER) effect is the change in the electrical
resistance of a ferroelectric tunnel junction (FTJ) associated with
polarization reversal in the ferroelectric barrier layer. Here we predict that
a FTJ with a composite barrier that combines a functional ferroelectric film
and a thin layer of a n... | 0906.1524v1 |
2009-08-11 | Contrasting Pressure Effects in Sr2VFeAsO3 and Sr2ScFePO3 | We report the resistivity measurements under pressure of two Fe-based
superconductors with a thick perovskite oxide layer, Sr2VFeAsO3 and Sr2ScFePO3.
The superconducting transition temperature Tc of Sr2VFeAsO3 markedly increases
with increasing pressure. Its onset value, which was Tc{onset}=36.4 K at
ambient pressure, ... | 0908.1469v2 |
2010-03-11 | Nonlinear response and two stable electrical conductivity levels measured in plasticized PVC thin film samples | The electrical conductivity of PVC films prepared with a patented plasticizer
of type "A" was measured with high precision automated setup, based on standard
ring sell with a voltage range much less than breakdown voltage. Continual
voltage-current measurements permit to take into account Debay relaxation
process and c... | 1003.2331v1 |
2010-09-13 | Non-monotonic temperature dependent transport in graphene grown by Chemical Vapor Deposition | Temperature-dependent resistivity of graphene grown by chemical vapor
deposition (CVD) is investigated. We observe in low mobility CVD graphene
device a strong insulating behavior at low temperatures and a metallic behavior
at high temperatures manifesting a non-monotonic in the temperature dependent
resistivity.This f... | 1009.2506v2 |
2010-10-14 | Viscous corrections to the resistance of nano-junctions: a dispersion relation approach | It is well known that the viscosity of a homogeneous electron liquid diverges
in the limits of zero frequency and zero temperature. A nanojunction breaks
translational invariance and necessarily cuts off this divergence. However, the
estimate of the ensuing viscosity is far from trivial. Here, we propose an
approach ba... | 1010.2959v2 |
2011-05-18 | Multiple photoexcitation of two-dimensional electron systems: bichromatic magnetoresistance oscillations revisited | We analyze theoretically magnetoresistance of high mobility two-dimensional
electron systems being illuminated by multiple radiation sources. In
particular, we study the influence on the striking effect of microwave-induced
resistance oscillations. We consider moderate radiation intensities without
reaching the zero re... | 1105.3592v1 |
2011-07-11 | Impairment of double exchange mechanism in electron transport of iron pnictides | Double exchange mechanism is believed to favor transport along ferromagnetic
directions, the failure of which in explaining the unusual resistivity
anisotropy in iron pnictides is investigated. Several factors intrinsic to the
microscopic mechanism of transport in iron pnictides are identified and
analyzed, including t... | 1107.1952v1 |
2011-10-24 | Anisotropy of upper critical fields and thermally-activated flux flow of quenched KxFe2-ySe2 single crystals | We report the anisotropy of the upper critical fields mu0Hc2(T) and
thermally-activated flux flow (TAFF) behavior of quenched KxFe2-ySe2. Even
though the post-annealing and quenching process enhances the superconducting
volume fraction, it has a minor effect on the upper critical fields for H//c
and H//ab. Analysis of ... | 1110.5316v1 |
2011-10-26 | Mg substitution in CuCrO2 delafossite compounds | A detailed investigation of the series CuCr(1-x)MgxO2 (x = 0.0 - 0.05) has
been performed by making high-temperature resistivity and thermopower
measurements, and by performing a theoretical analysis of the latter.
Microstructure characterization has been carried out as well. Upon Mg2+ for
Cr3+ substitution, a concomit... | 1110.5730v2 |
2011-11-09 | Insulator-to-metal transition and large thermoelectric effect in La$_{1-x}$Sr$_{x}$MnAsO | We report the Sr substitution effect in an antiferromagnetic insulator
LaMnAsO. The Sr doping limit is $x\sim$ 0.10 under the synthesis conditions, as
revealed by x-ray diffractions indicate. Upon Sr doping, the room-temperature
resistivity drops by five orders of magnitude down to $\sim$0.01
$\Omega\cdot$cm, and the t... | 1111.2232v1 |
2011-11-23 | Magneto-Electric Effects on Sr Z-type Hexaferrite at Room Temperature | In this paper, magnetoelectric effects of Sr Z-type hexaferrite,
Sr3Fe24Co2O41, at room temperature is measured. The change in remanence
magnetization was measured by applying a DC voltage or electric field across a
slab of hexaferrite. Changes of ~ 18% in remanence was observed in an electric
field of 10,000V/cm imply... | 1111.5555v1 |
2011-11-23 | Room Temperature Magnetoelectric Effects on Single Slabs of Z-type Hexaferrites | In this paper, magnetoelectric effects of Sr Z-type hexaferrite,
Sr3Fe24Co2O41, at room temperature is measured. The change in remanence
magnetization was measured by applying a DC voltage or electric field across a
slab of hexaferrite. Changes of ~ 18% in remanence was observed in an electric
field of 10,000V/cm imply... | 1111.5556v1 |
2012-02-05 | Temperature dependent elastic constants and ultimate strength of graphene and graphyne | Based on the first principles calculation combined with quasi-harmonic
approximation, in this work we focus on the analysis of temperature dependent
lattice geometries, thermal expansion coefficients, elastic constants and
ultimate strength of graphene and graphyne. For the linear thermal expansion
coefficient, both gr... | 1202.0933v1 |
2012-02-08 | Coexisting Holes and Electrons in High-Tc Materials: Implications from Normal State Transport | Normal state resistivity and Hall effect are shown to be successfully modeled
by a two-band model of holes and electrons that is applied self-consistently to
(i) DC transport data reported for eight bulk-crystal and six oriented-film
specimens of YBa2Cu3O7-{\delta}, and (ii) far-infrared Hall angle data reported
for YB... | 1202.1792v1 |
2012-07-25 | Superconductivity at 5.4 K in $β$-Bi$_2$Pd | We investigate bulk superconductivity in a high-quality single crystal of
Bi$_2$Pd ($\beta$-Bi$_2$Pd, space group; I4/mmm) at temperatures less than 5.4
K by exploring its electrical resistivity, magnetic susceptibility, and
specific heat. The temperature dependence of the electrical resistivity shows
convex-upward beh... | 1207.5905v3 |
2012-10-09 | Giant exchange bias and ferromagnetism in the CoO shell of Co/CoO-MgO core-shell nanoparticles | Using magnetron sputtering, we produced a series of Co/CoO-MgO nanoparticles
on Si(100) substrates. High-resolution transmission electron microscopy (HRTEM)
image shows that small isolated Co-clusters (core) covered with CoO (shells)
with a size of a few nm embedded in a MgO matrix. Resistivity as a function of
Co atom... | 1210.2510v1 |
2012-11-12 | Density dependent electrical conductivity in suspended graphene: Approaching the Dirac point in transport | We theoretically consider, comparing with the existing experimental
literature, the electrical conductivity of gated monolayer graphene as a
function of carrier density, temperature, and disorder in order to assess the
prospects of accessing the Dirac point using transport studies in high-quality
suspended graphene. We... | 1211.2845v2 |
2012-12-26 | Molybdenum sputtering film characterization for high gradient accelerating structures | Technological advancements are strongly required to fulfill the demands of
new accelerator devices with the highest accelerating gradients and operation
reliability for the future colliders. To this purpose an extensive R&D
regarding molybdenum coatings on copper is in progress. In this contribution we
describe chemica... | 1212.6203v1 |
2012-12-28 | Magneto-resistance up to 60 Tesla in Topological Insulator Bi2Te3 Thin Films | We report magneto-transport studies of topological insulator Bi_{2}Te_{3}
thin films grown by pulsed laser deposition. A non-saturating linear-like
magneto-resistance (MR) is observed at low temperatures in the magnetic field
range from a few Tesla up to 60 Tesla. We demonstrate that the strong
linear-like MR at high f... | 1212.6464v1 |
2013-01-02 | Visualizing Atomic-Scale Negative Differential Resistance in Bilayer Graphene | We investigate the atomic-scale tunneling characteristics of bilayer graphene
on silicon carbide using the scanning tunneling microscopy. The high-resolution
tunneling spectroscopy reveals an unexpected negative differential resistance
(NDR) at the Dirac energy, which spatially varies within the single unit cell
of bil... | 1301.0270v1 |
2013-04-01 | Pressure Induced Superconductivity and Structural Transitions in Ba(Fe0.9Ru0.1)2As2 | High pressure electrical resistance and x-ray diffraction measurements have
been performed on ruthenium-doped Ba(Fe0.9Ru0.1)2As2, up to pressures of 32 GPa
and down to temperatures of 10 K, using designer diamond anvils under
quasi-hydrostatic conditions. At 3.9 GPa, there is an evidence of
pressure-induced superconduc... | 1304.0298v2 |
2013-04-10 | Charge Kondo Effect in Thermoelectric Properties of Lead Telluride doped with Thallium Impurities | We investigate the thermoelectric properties of PbTe doped with a small
concentration $x$ of Tl impurities acting as acceptors and described by
Anderson impurities with negative on-site (effective) interaction. The
resulting charge Kondo effect naturally accounts for a number of the low
temperature anomalies in this sy... | 1304.3026v1 |
2013-04-22 | Modeling Composites of Multi-Walled Carbon Nanotubes in Polycarbonate | High strain rate experiments performed on multi-walled carbon nanotubes and
polycarbonate composites (MWCNT-PC) have exhibited enhanced impact resistance
under a dynamic strain rate of nearly 2500/s with composition of only 0.5 to
2.0 percent of Multi walled carbon nanotubes(MWCNTs) in pure polycarbonate(PC).
Similarly... | 1304.5979v1 |
2013-08-15 | Suppression of bulk conductivity in InAs/GaSb broken gap composite quantum wells | The two-dimensional topological insulator state in InAs/GaSb quantum wells
manifests itself by topologically protected helical edge channel transport
relying on an insulating bulk. This work investigates a way of suppressing bulk
conductivity by using gallium source materials of different degrees of impurity
concentrat... | 1308.3375v2 |
2013-09-06 | Heteroepitaxy of Group IV-VI Nitrides by Atomic Layer Deposition | Heteroepitaxial growth of selected group IV-VI nitrides on various
orientations of sapphire (\alpha-Al2O3) is demonstrated using atomic layer
deposition. High quality, epitaxial films are produced at significantly lower
temperatures than required by conventional deposition methods. Characterization
of electrical and su... | 1309.1789v1 |
2013-10-31 | Single crystal growth and characterization of the large-unit-cell compound Cu13Ba | Single crystals of Cu$_{13}$Ba were successfully grown out of Ba-Cu self
flux. Temperature dependent magnetization, $M(T)$, electrical resistivity,
$\rho(T)$, and specific heat, $C_p(T)$, data are reported. Isothermal
magnetization measurements, $M(H)$, show clear de Haas-van Alphen oscillations
at $T$ = 2 K for applie... | 1311.0027v1 |
2013-11-22 | Thermally excited multi-band conduction in LaAlO3/SrTiO3 heterostructures exhibiting magnetic scattering | Magnetotransport measurements of charge carriers at the interface of a
LaAlO3/SrTiO3 heterostructure with 26 unit cells of LaAlO3 show Hall resistance
and magnetoresistance which at low and high temperatures is described by a
single channel of electron-like charge carriers. At intermediate temperatures,
we observe non-... | 1311.5807v1 |
2014-04-18 | Systematic control of carrier concentration and resisitivity in RF sputtered Zinc oxide thin films | RF sputtered ZnO and Al:ZnO films are attractive transparent conductive
oxides for fabrication of opto-electronic devices. In this paper we present
efforts to control carrier concentration and mobility of ZnO/Al:ZnO thin films
by controlling deposition parameters (RF power, pressure and substrate
temperature. Al:ZnO th... | 1404.4902v1 |
2014-04-17 | Caracterización de austenita expandida generada por cementación iónica de aceros inoxidables. Estudio de la estabilidad frente a la irradiación con haces de iones ligeros energéticos | This thesis was focused on the surface modification with plasma discharge.
Austenitic AISI 316L stainless steel sample was carburised under different
experimental conditions and mechanical properties have been studied (thickness,
lattice parameter, elemental composition, hardness, wear resistance and
corrosion resistan... | 1404.5204v1 |
2014-05-05 | Controllable growth of Al nanorods for inexpensive and degradation-resistant surface enhanced Raman spectroscopy | Surface enhanced Raman spectroscopy (SERS) has the capacity of detecting
trace amount of biological or chemical matter, even single molecules, through
the use of metallic nanostructures such as nanorods. Silver (Ag) and gold (Au)
nanorods have led to the impressive enhancement of Raman signals, but they are
either expe... | 1405.1009v1 |
2014-06-27 | Simulation of Non-linear SRF losses derived from characteristic topography of etched and electropolished niobium surfaces | A simplified numerical model has been developed to simulate non-linear
superconducting radiofrequency (SRF) losses on Nb surfaces. This study focuses
exclusively on excessive surface resistance (Rs) losses due to the microscopic
topographical magnetic field enhancements. When the enhanced local surface
magnetic field e... | 1406.7276v4 |
2015-01-25 | Superconductivity in Dense Rashba Semiconductor BiTeCl | Layered non-centrosymmetric bismuth tellurohalides are being examined as
candidates for topological insulators. Pressure is believed to be essential for
inducing and tuning topological order in these systems. Through electrical
transport and Raman scattering measurements, we find superconductivity in two
high-pressure ... | 1501.06203v1 |
2015-02-04 | Topological Insulator Thin Films Starting from the Amorphous Phase - Bi$_2$Se$_3$ as Example | We present a new method to obtain topological insulator Bi$_2$Se$_3$ thin
films with a centimeter large lateral length. To produce amorphous Bi$_2$Se$_3$
thin films we have used a sequential flash-evaporation method at room
temperature. Transmission electron microscopy has been used to verify that the
prepared samples ... | 1502.01135v1 |
2015-03-13 | Suspended graphene devices with local gate control on an insulating substrate | We present a fabrication process for graphene-based devices where a graphene
monolayer is suspended above a local metallic gate placed in a trench. As an
example we detail the fabrication steps of a graphene field-effect transistor.
The devices are built on a bare high-resistivity silicon substrate. At
temperatures of ... | 1503.04147v2 |
2015-03-18 | A novel fast timing micropattern gaseous detector: FTM | In recent years important progress in micropattern gaseous detectors has been
achieved in the use of resistive material to build compact spark-protected
devices. The novel idea presented here consists of the polarisation of WELL
structures using only resistive coating. This allows a new device to be built
with an archi... | 1503.05330v1 |
2015-10-19 | High resolution Hall measurements across the VO2 metal-insulator transition reveal impact of spatial phase separation | Many strongly correlated transition metal oxides exhibit a metal-insulator
transition (MIT), the manipulation of which is essential for their application
as active device elements. However, such manipulation is hindered by lack of
microscopic understanding of mechanisms involved in these transitions. A
prototypical exa... | 1510.05414v1 |
2016-02-12 | Relaxation of the resistive superconducting state in boron-doped diamond films | We report a study of the relaxation time of the restoration of the resistive
superconducting state in single crystalline boron-doped diamond using
amplitude-modulated absorption of (sub-)THz radiation (AMAR). The films grown
on an insulating diamond substrate have a low carrier density of about
2.5x10^{21} cm^{-3} and ... | 1602.04046v1 |
2016-05-12 | Scalable, ultra-resistant structural colors based on network metamaterials | Structural colours have drawn wide attention for their potential as a future
printing technology for various applications, ranging from biomimetic tissues
to adaptive camouflage materials. However, an efficient approach to realise
robust colours with a scalable fabrication technique is still lacking,
hampering the real... | 1605.03700v1 |
2016-08-02 | Low-energy electron-irradiation effect on transport properties of graphene field effect transistor | We study the effects of low-energy electron beam irradiation up to 10 keV on
graphene based field effect transistors. We fabricate metallic bilayer
electrodes to contact mono- and bi-layer graphene flakes on SiO$_2$, obtaining
specific contact resistivity $\rho_c \simeq 19 k\Omega \mu m^2$ and carrier
mobility as high ... | 1608.00716v1 |
2016-08-23 | Disorder effect on the anisotropic resistivity of phosphorene determined by a tight-binding model | In this work we develop a compact multi-orbital tight-binding model for
phosphorene that accurately describes states near the main band gap. The model
parameters are adjusted using as reference the band structure obtained by a
density-functional theory calculation with the hybrid HSE06 functional. We use
the optimized ... | 1608.06633v2 |
2016-10-21 | Giant Positive Magnetoresistance and field-induced metal insulator transition in Cr2NiGa | We report here the magneto-transport properties of the newly synthesized
Heusler compound Cr2NiGa which crystallizes in a disordered cubic B2 structure
belonging to Pm-3m space group. The sample is found to be paramagnetic down to
2 K with metallic character. On application of magnetic field, a significantly
large incr... | 1610.06771v1 |
2017-02-08 | Hall field-induced resistance oscillations in MgZnO/ZnO heterostructures | We report on nonlinear magnetotransport in a two-dimensional electron gas
hosted in a MgZnO/ZnO heterostructure. Upon application of a direct current, we
observe pronounced Hall field-induced resistance oscillations (HIRO) which are
well known from experiments on high-mobility GaAs/AlGaAs quantum wells. The
unique sens... | 1702.02557v1 |
2017-02-22 | Variable-range-hopping conduction processes in oxygen deficient polycrystalline ZnO films | We have fabricated oxygen deficient polycrystalline ZnO films by the rf
sputtering deposition method. To systematically investigate the charge
transport mechanisms in these samples, the electrical resistivities have been
measured over a wide range of temperature from 300 K down to liquid-helium
temperatures. We found t... | 1702.06729v1 |
2017-06-25 | Coherent Interlayer Tunneling and Negative Differential Resistance with High Current Density in Double Bilayer Graphene-WSe2 Heterostructures | We demonstrate gate-tunable resonant tunneling and negative differential
resistance between two rotationally aligned bilayer graphene sheets separated
by bilayer WSe2. We observe large interlayer current densities of 2 uA/um2 and
2.5 uA/um2, and peak-to-valley ratios approaching 4 and 6 at room temperature
and 1.5 K, r... | 1706.08034v1 |
2017-09-08 | Coulomb drag and counterflow Seebeck coefficient in bilayer-graphene double layers | We have fabricated bilayer-graphene double layers separated by a thin
($\sim$20 nm) boron nitride layer and performed Coulomb drag and counterflow
thermoelectric transport measurements. The measured Coulomb drag resistivity is
nearly three orders smaller in magnitude than the intralayer resistivities. The
counterflow S... | 1709.02778v1 |
2017-11-05 | Synthesis of sodium cobaltate Na$_{x}$CoO$_{2}$ single crystals with controlled Na ordering | In this study, we synthesized single crystals of Na$_{x}$CoO$_{2}$ with
$x\sim0.8$ using the optical floating zone technique. A thorough
electrochemical treatment of the samples permitted us to control the
de-intercalation of Na to obtain single crystal samples of stable Na ordered
phases with $x=0.5-0.8$. Comparisons ... | 1711.01611v2 |
2018-01-19 | Nontrivial Metallic State of Molybdenum Disulfide | The electrical conductivity and Raman spectroscopy measurements have been
performed on MoS$_2$ at high pressures up to 90 GPa and variable temperatures
down to 5 K. We find that the temperature dependence of the resistance in a
metallic 2H$_a$ phase has an anomaly (a hump) which shifts with pressure to
higher temperatu... | 1801.06351v1 |
2019-05-23 | Laser machined ultrathin microscale platinum thermometers on transparent oxide substrates | Ultrathin microscale resistive thermometers are of key value to many
applications. Here we have fabricated a laser machined 50 ${\mu}$m wide and 50
nm thick serpentine Pt thin film sensor capable of sensing temperatures up to
650 ${^\circ}$ C over multiple heating and cooling cycles. Various materials
and associated pr... | 1905.09812v1 |
2014-08-06 | Desarrollo de capas de AlN sobre aleaciones de aluminio como protección superficial contra la corrosión y el desgaste | Aluminum and their alloys, after careful treatments, can develop excellent
mechanical, tribological, electrical and chemical (high corrosion resistance)
properties. However, 7000 series, with Cu in the alloy, have a poor corrosion
resistance. On the other hand, aluminum nitride (AlN) has a wurtzitic phase and
good ther... | 1408.1378v1 |
2014-08-28 | Magneto-Dielectric Behavior in $La_{0.53}Ca_{0.47}MnO_{3}$ | We prospect magneto-dielectricity in $La_{0.53}Ca_{0.47}MnO_{3}$ across its
paramagnetic (PMI) to ferromagnetic (FMM) isostructural transition at $T_{C}
\sim 253K$, by magnetic ($(M)$), caloric ($(W)$), dielectric ($(\epsilon')$),
magneto-resistive (MR), and magneto-capacitance (MC) investigations.
Skew-broadened first... | 1408.6640v2 |
2017-03-02 | Thermal conduction across a boron nitride and silicon oxide interface | The needs for efficient heat removal and superior thermal conduction in
nano/micro devices have triggered tremendous studies in low-dimensional
materials with high thermal conductivity. Hexagonal boron nitride (h-BN) is
believed to be one of the candidates for thermal management and heat
dissipation due to its novel ph... | 1703.00669v1 |
2019-02-10 | The role of plastic strain gradients in the crack growth resistance of metals | Crack advance from short or long pre-cracks is predicted by the progressive
failure of a cohesive zone in a strain gradient, elasto-plastic solid. The
presence of strain gradients leads to the existence of an elastic zone at the
tip of a stationary crack, for both the long crack and the short crack cases.
This is in sh... | 1902.03664v1 |
2019-07-11 | Impurity concentration dependent electrical conduction in germanium crystal at low temperatures | Germanium single crystal having 45 mm diameter and 100 mm length of 7N+
purity has been grown by Czochralski method. Structural quality of the crystal
has been characterized by Laue diffraction. Electrical conduction and Hall
measurements are carried out on samples retrieved from different parts of the
crystal along th... | 1907.05067v1 |
2020-02-25 | Non-invasive nanoscale potentiometry and ballistic transport in epigraphene nanoribbons | The recent observation of non-classical electron transport regimes in
two-dimensional materials has called for new high-resolution non-invasive
techniques to locally probe electronic properties. We introduce a novel hybrid
scanning probe technique to map the local resistance and electrochemical
potential with nm- and $... | 2002.11024v1 |
2020-04-07 | Multi-terminal electronic transport in boron nitride encapsulated TiS$_3$ nanosheets | We have studied electrical transport as a function of carrier density,
temperature and bias in multi-terminal devices consisting of hexagonal boron
nitride (h-BN) encapsulated titanium trisulfide (TiS$_3$) sheets. Through the
encapsulation with h-BN, we observe metallic behavior and high electron
mobilities. Below $\si... | 2004.03687v1 |
2020-04-09 | Magnetic field-dependent resistance crossover and logarithmic to non-saturating magnetoresistance in topological insulator Bi$_2$Te$_3$ | We report a metal-insulator like transition in single crystalline 3D
topological insulator Bi2Te3 at a temperature of 230K in presence of an
external magnetic field applied normal to the surface. This transition becomes
more prominent at larger magnetic field strength with the residual resistance
value increasing linea... | 2004.04375v2 |
2012-01-02 | Magnetodielectric behavior in La2CoMnO6 nanoparticles | We have investigated magnetic, dielectric and magnetodielectric properties of
La2CoMnO6 nanoparticles prepared by sol-gel method. Magnetization measurements
revealed two distinct ferromagnetic transitions at 218 K and 135 K that can be
assigned to ordered and disordered magnetic phases of the La2CoMnO6
nanoparticles. T... | 1201.0448v1 |
2012-01-30 | Unusual size effects on thermoelectricity in a strongly correlated oxide | We investigated size effects on thermoelectricity in thin films of a strongly
correlated layered cobaltate. At room temperature, the thermopower is
independent of thickness down to 6 nm. This unusual behavior is inconsistent
with the Fuchs-Sondheimer theory, which is used to describe conventional metals
and semiconduct... | 1201.6274v1 |
2016-03-05 | MIRO-like oscillations of magneto-resistivity in GaAs heterostructures induced by THz radiation | We report on the study of terahertz radiation induced MIRO-like oscillations
of magneto-resistivity in GaAs heterostructures. Our experiments provide an
answer on two most intriguing questions - effect of radiation helicity and the
role of the edges - yielding crucial information for understanding of the MIRO
origin. M... | 1603.01760v1 |
2017-05-17 | Epitaxial electrical contact to graphene on SiC | Establishing good electrical contacts to nanoscale devices is a major issue
for modern technology and contacting 2D materials is no exception to the rule.
One-dimensional edge-contacts to graphene were recently shown to outperform
surface contacts but the method remains difficult to scale up. We report a
resist-free an... | 1705.08257v2 |
2017-07-10 | Phonon-Driven Electron Scattering and Magnetothermoelectric Effect in Two-Dimensional Tin Selenide | The bulk tin selenide (SnSe) is the best thermoelectric material currently
with the highest figure-of-merit due to the strong phonon-phonon interactions.
We investigate the effect of electron-phonon coupling (EPC) on the transport
properties of two-dimensional (2D) SnSe sheet. We demonstrate that EPC plays a
key role i... | 1707.02737v1 |
2019-03-05 | Development of a time projection chamber with a sheet-resistor field cage | A new-concept time projection chamber (TPC) using a commercial resistive
sheet, sheet-resistor micro-TPC SR-microPIC, was developed and its performance
was measured. SR-microTPC has the potential to create a more uniform electric
field than conventional TPCs with resistor-chains owing to its continuous sheet
resistivit... | 1903.01663v3 |
2019-03-30 | Disentangling spin-orbit coupling and local magnetism in a quasi-two-dimensional electron system | Quantum interference between time-reversed electron paths in two dimensions
leads to the well-known weak localization correction to resistance. If
spin-orbit coupling is present, the resistance correction is negative, termed
weak anti-localization (WAL). Here we report the observation of WAL coexisting
with exchange co... | 1904.00295v2 |
2019-08-27 | Large surface conductance and two-dimensional superconductivity in microstructured crystalline topological insulators | Controllable geometric manipulation via micromachining techniques provides a
promising tool for enhancing useful topological electrical responses relevant
to future applications such as quantum information science. Here we present
microdevices fabricated with focused ion beam from indium-doped topological
insulator Pb1... | 1908.10427v1 |
2019-12-11 | Pressure-induced superconductivity and structural transition in ferromagnetic Cr2Si2Te6 | The discovery of intrinsic magnetism in atomically thin two-dimensional
transition-metal trichalcogenides has attracted intense research interest due
to the exotic properties of magnetism and potential applications in devices.
Pressure has proven to be an effective tool to manipulate the crystal and
electronic structur... | 1912.05166v1 |
2012-06-23 | Molecular-beam epitaxial growth of a far-infrared transparent electrode for extrinsic Germanium photoconductors | We have evaluated the optical and electrical properties of a far-infrared
(IR) transparent electrode for extrinsic germanium (Ge) photoconductors at 4 K,
which was fabricated by molecular beam epitaxy (MBE). As a far-IR transparent
electrode, an aluminum (Al)-doped Ge layer is formed at well-optimized doping
concentrat... | 1206.5368v1 |
2015-04-08 | Post-growth purification of Co nanostructures prepared by focused electron beam induced deposition | In the majority of cases nanostructures prepared by focused electron beam
induced deposition (FEBID) employing an organometallic precursor contain
predominantly carbon-based ligand dissociation products. This is unfortunate
with regard to using this high-resolution direct-write approach for the
preparation of nanostruc... | 1504.01945v1 |
2015-06-22 | Preparation, characterization, and electrical properties of epitaxial NbO2 thin film lateral devices | Epitaxial NbO2 (110) films, 20 nm thick, were grown by pulsed laser
deposition on Al2O3 (0001) substrates. The Ar/O2 total pressure during growth
was varied to demonstrate the gradual transformation between NbO2 and Nb2O5
phases, which was verified using x-ray diffraction, x-ray photoelectron
spectroscopy, and optical ... | 1506.06640v2 |
2018-07-25 | Galvanomagnetic properties of the putative type-II Dirac semimetal PtTe$_2$ | Platinum ditelluride has recently been characterized, based on angle-resolved
photoemission spectroscopy data and electronic band structure calculations, as
a possible representative of type-II Dirac semimetals. Here, we report on the
magnetotransport behavior (electrical resistivity, Hall effect) in this
compound, inv... | 1807.09876v1 |
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