publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
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2023-01-18 | Probing electron-electron interaction along with superconducting fluctuations in disordered TiN thin films | Here, we demonstrate an interplay between superconducting fluctuations and
electron-electron interaction (EEI) by low temperature magnetotransport
measurements for a set of 2D disordered TiN thin films. While cooling down the
sample, a characteristic temperature T* is obtained from the R(T) at which
superconducting flu... | 2301.07648v1 |
2023-02-08 | Bioabsorbable WE43 Mg alloy wires modified by continuous plasma electrolytic oxidation for implant applications. Part II: degradation and biological performance | The corrosion, mechanical degradation and biological performance of
cold-drawn WE43 Mg wires were analyzed as a function of thermo-mechanical
processing and the presence of a protective oxide layer created by continuous
plasma electrolytic oxidation (PEO). It was found that the corrosion properties
of the non-surface-t... | 2302.13778v1 |
2023-02-28 | Quantifying interaction mechanism in infinite layer nickelate superconductors | The relationship between the long-range antiferromagnetic order in cuprates
and the high-temperature superconductivity in these compounds represents
unresolved, nearly four-decades long scientific problem. Because recently
discovered nickelate superconductors are crystallographical counterparts of
cuprates, many proper... | 2302.14729v3 |
2023-03-11 | Non-Fermi-Liquid Behavior of Superconducting SnH$_4$ | We studied chemical interaction of Sn with H$_2$ by X-ray diffraction methods
at pressures of 180-210 GPa. A previously unknown tetrahydride SnH$_4$ with a
cubic structure (${fcc}$) exhibiting superconducting properties below ${T}$$_C$
= 72 K was obtained; the formation of a high molecular ${C2/m}$-SnH$_{14}$
superhydr... | 2303.06339v2 |
2023-06-16 | Tailoring defects and nanocrystal transformation for optimal heating power in bimagnetic $Co_yFe_{1-y}O@Co_xFe_{3-x}O_4$ particles | The effects of cobalt incorporation in spherical heterostructured iron oxide
nanocrystals (NCs) of sub-critical size have been explored by colloidal
chemistry methods. Synchrotron X-ray total scattering methods suggest that
cobalt (Co) substitution in rock salt iron oxide NCs tends to remedy its vacant
iron sites, offe... | 2306.09684v1 |
2023-11-19 | Discovery of Superconductivity and Electron-Phonon Drag in the Non-Centrosymmetric Weyl Semimetal LaRhGe$_3$ | We present an exploration of the effect of electron-phonon coupling and
broken inversion symmetry on the electronic and thermal properties of the
semimetal LaRhGe$_3$. Our transport measurements reveal evidence for
electron-hole compensation at low temperatures, resulting in a large
magnetoresistance of 3000% at 1.8 K ... | 2311.11402v2 |
2024-01-10 | Droplet morphology-based wettability tuning and design of fog harvesting mesh to minimize mesh-clogging | Fog harvesting relies on intercepting atmospheric or industrial fog by
placing a porous obstacle, e.g., a mesh and collecting the deposited water. In
the face of global water scarcity, such fog harvesting has emerged as a viable
alternative source of potable water. Typical fog harvesting meshes suffer from
poor collect... | 2401.05284v2 |
2024-02-18 | Impact of the La2NiO4+δ oxygen content on the synaptic properties of the TiN/La2NiO4+δ/Pt memristive devices | The rapid development of brain-inspired computing requires new artificial
components and architectures for its hardware implementation. In this regard,
memristive devices emerged as potential candidates for artificial synapses
because of their ability to emulate the plasticity of the biological synapses.
In this work, ... | 2402.11612v1 |
2024-03-12 | Electronic and dynamical properties of cobalt monogermanide CoGe phases under pressure | We present the pressure dependence of the electronic and dynamical properties
of six different CoGe phases: orthorhombic Cmmm, hexagonal P6/mmm and
P$\bar{6}$2m, monoclinic C2/m, cubic P2$_{1}$3, and orthorhombic Pnma. Using
first-principles DFT calculations and the direct force-constants method, we
study the dynamical... | 2403.07580v1 |
1996-07-09 | Anomalous magnetic response of the valence-fluctuating compound YbInCu4 | The exact solution of the spin one-half Falicov-Kimball model, with random
hopping between the lattice sites, is used to explain the anomalous magnetic
response of Yb-based valence-fluctuating intermetallic compounds. The anomalous
behavior arises from an entropy-driven local-moment--nonmagnetic transition of
unhybridi... | 9607068v1 |
1996-09-27 | Magnetoresistance in La(1-x)SrxCoO3 for 0.05 - x - 0.25 | The dc resistivity, magnetoresistance and magnetic susceptibility of
La(1-x)SrxCoO3 compounds have been investigated in the temperature range of 4K
to 300K for magnetic fields up to 7 T. In the doping range studied (0.05 - x -
0.25) the electronic properties of the material exhibit a crossover from
semiconducting to me... | 9609274v1 |
1997-07-01 | e-h Coherence and Charging Effects in Ultrasmall Metallic Grains | We consider a model for electron tunneling between a pair of ultrasmall
metallic grains. Under appropriate circumstances, non-equilibrium final state
effects can strongly enhance tunneling and produce electron-hole coherence
between the grains. The model displays a quantum phase transition between a
Coulomb blockaded s... | 9707014v1 |
1997-07-18 | Shearing the Vacuum - Quantum Friction | We consider two perfectly smooth featureless surfaces at T=0, defined only by
their respective dielectric functions, separated by a finite distance, and ask
the question whether they can experience any friction when sheared parallel to
their interface. We find large frictional effects comparable to everyday
frictional ... | 9707190v2 |
1998-02-25 | Magnetization Controlled Superconductivity in a Film with Magnetic Dots | We consider a superconducting film with Magnetic Dots Array (MDA) placed on
it. Magnetic moments of these dots are supposed to be normal to the film and
strong enough to create vortices in the superconducting film. Magnetic
interaction between dots is negligible. Below the superconducting transition
temperature of the ... | 9802276v1 |
1998-03-28 | Anomalous Hall Effect in Double Exchange Magnets | We investigate the possible origin of anomalous Hall effect in the CMR
(colossal magnetoresistance) materials - the doped rare earth manganites -
observed recently by Matl et al. It is demonstrated that the spin-orbit
interaction in the double exchange model couples magnetization to the Berry
phase associated with thre... | 9803350v1 |
1998-07-13 | Magnetoresistance of Epitaxial Fe Wires with Varied Domain Wall Structure | The low temperature negative domain wall (DW) contribution to the resistivity
observed in expitaxial Fe microstructures has been investigated as a function
of film thickness. The DW spin structure changes from Bloch to Neel-like with
decreasing film thickness. Results suggest that an interplay between orbital
effects i... | 9807183v1 |
1998-09-02 | Rolling friction of a hard cylinder on a viscous plane | The resistance against rolling of a rigid cylinder on a flat viscous surface
is investigated. We found that the rolling-friction coefficient reveals
strongly non-linear dependence on the cylinder's velocity. For low velocity the
rolling-friction coefficient rises with velocity due to increasing deformation
rate of the ... | 9809053v1 |
1998-12-10 | Electric field and potential around localized scatterers in thin metal films studied by scanning tunneling potentiometry | Direct observation of electric potential and field variation near local
scatterers like grain boundaries, triple points and voids in thin platinum
films studied by scanning tunneling potentiometry is presented. The field is
highest at a void, followed by a triple point and a grain boundary. The local
field near a void ... | 9812167v1 |
1999-01-11 | Effect of disorder on the Kondo behavior of thin Cu(Mn) films | We have studied the influence of disorder on the Kondo effect in thin films
of Cu(Mn), i.e., Cu doped with a small amount of Mn. We find that the Kondo
contribution to the resistivity is suppressed when the elastic mean-free-path,
$\lambda$, is reduced. While this is qualitatively similar to results found
previously by... | 9901092v1 |
1999-03-10 | Large Thermopower in a Layered Oxide NaCo_2O_4 | A transition-metal oxide NaCo_2O_4 is a layered oxide in which CoO_2 and Na
alternately stack along the c axis. Recently we have found that this compound
shows unusually large thermopower with low resistivity, which is comparable to
those of Bi_2Te_3. The negative transverse magnetoresistance and the strongly
temperatu... | 9903162v1 |
1999-07-05 | Chiral Glass Phase in Ceramic Superconductors | A three-dimensional lattice of the Josephson junctions with a finite
self-conductance is employed to model the ceramic superconductors. By Monte
Carlo simulations it is shown that the chiral glass phase is stable in three
dimensions even under the influence of screening. The nonlinear ac
susceptibility and the compensa... | 9907060v1 |
1999-09-01 | Polyethylene under tensile load: strain energy storage and breaking of linear and knotted alkanes probed by first-principles molecular dynamics calculations | The mechanical resistance of a polyethylene strand subject to tension and the
way its properties are affected by the presence of a knot is studied using
first-principles molecular dynamics calculations. The distribution of strain
energy for the knotted chains has a well-defined shape that is very different
from the one... | 9909013v1 |
1999-11-09 | Heat capacity and transport studies of the ferromagnetic superconductor RuSr2GdCu2O8 | Resistivity, thermoelectric power and heat capacity are investigated in the
ferromagnetic superconductor RuSr2GdCu2O8 with and without Zn substitution. The
thermodynamic signatures of the ordering of the Ru moments and the paramagnetic
Gd moments as well as the onset of superconductivity are all clearly seen and
quanti... | 9911135v1 |
2000-02-14 | Scanned Probe Microscopy of Electronic Transport in Carbon Nanotubes | We use electrostatic force microscopy and scanned gate microscopy to probe
the conducting properties of carbon nanotubes at room temperature. Multi-walled
carbon nanotubes are shown to be diffusive conductors, while metallic
single-walled carbon nanotubes are ballistic conductors over micron lengths.
Semiconducting sin... | 0002209v1 |
2000-03-27 | Current and power spectrum in a magnetic tunnel device with an atomic size spacer | Current and its noise in a ferromagnetic double tunnel barrier device with a
small spacer particle were studied in the framework of the sequential tunneling
approach. Analytical formulae were derived for electron tunneling through the
spacer particle containing only a single energy level. It was shown that
Coulomb inte... | 0003418v1 |
2000-05-25 | Magnetic-Field-Driven Superconductor-Insulator-Type Transition in Graphite | A magnetic-field-driven transition from metallic- to semiconducting-type
behavior in the basal-plane resistance takes place in highly oriented pyrolytic
graphite at a field $H_c \sim 1~$kOe applied along the hexagonal c-axis. The
analysis of the data reveals a striking similarity between this transition and
that measur... | 0005439v1 |
2000-11-29 | Giant Magnetoresistance at the Interface of Iron Thin Films | Ag/Fe/Ag and Cr/Fe/Cr trilayers with a single $25 nm$ thick ferromagnetic
layer exhibit giant magnetoresistance (GMR) type behavior. The resistance
decreases for parallel and transversal magnetic field alignements with a
Langevin-type magnetic field dependence up to B=12 T. The phenomenon is
explained by a granular int... | 0011491v1 |
2001-01-22 | Orbital Correlations in the Ferromagnetic Half-Metal $CrO_{2} | We deduce a model relevant for the description of the ferromagnetic
half-metal Chromium dioxide ($CrO_{2}$), widely used in magnetic recording
technology. The model describes the effect of dynamical, local orbital
correlations arising from local quantum chemistry of the material. A finite
temperature solution of the mo... | 0101335v1 |
2001-03-06 | Coherent description of electrical and thermal impurity-and-phonon limited transport in simple metals | The electrical resistivity, thermoelectric power and electronic thermal
conductivity of simple (isotropic) metals are studied in a uniform way.
Starting from results of a variational solution of the Boltzmann equation, a
generalized Matthiessen rule is used in order to superpose the inelastic (or
not) electron-phonon a... | 0103138v1 |
2001-03-08 | Localization corrections to the anomalous Hall effect in a ferromagnet | We calculate the localization corrections to the anomalous Hall conductivity
related to the contribution of spin-orbit scattering into the current vertex
(side-jump mechanism). We show that in contrast to the ordinary Hall effect,
there exists a nonvanishing localization correction to the anomalous Hall
resistivity. Th... | 0103182v1 |
2001-03-23 | Premartensitic Transition in Ni2+xMn1-xGa Heusler Alloys | The temperature dependencies of the resistivity and magnetization of a series
of Ni2+XMn1-XGa (X = 0 - 0.09) alloys were investigated. Along with the
anomalies associated with ferromagnetic and martensitic transitions,
well-defined anomalies were observed at the temperature of premartensitic
transformation. The premart... | 0103483v1 |
2001-04-24 | Electrical current distribution across a metal-insulator-metal structure during bistable switching | Combining scanning electron microscopy (SEM) and electron-beam-induced
current (EBIC) imaging with transport measurements, it is shown that the
current flowing across a two-terminal oxide-based capacitor-like structure is
preferentially confined in areas localized at defects. As the thin-film device
switches between tw... | 0104452v1 |
2001-04-24 | A simple one-dimensional model of heat conduction which obeys Fourier's law | We present the computer simulation results of a chain of hard point particles
with alternating masses interacting on its extremes with two thermal baths at
different temperatures. We found that the system obeys Fourier's law at the
thermodynamic limit. This result is against the actual belief that one
dimensional syste... | 0104453v1 |
2001-06-29 | Landau diamagnetism revisited | The problem of diamagnetism, solved by Landau, continues to pose fascinating
issues which have relevance even today. These issues relate to inherent quantum
nature of the problem, the role of boundary and dissipation, the meaning of
thermodynamic limits, and above all, the quantum-classical crossover occasioned
by envi... | 0106646v1 |
2001-07-12 | Theory of Angular Magnetoresistance in CPP spin valves | The resistance of CPP spin valve is a continuous function of the angle
$\theta $ between the magnetizations of both ferromagnets. We use the cicuit
theory for non-collinear magnetoelectronics to compute the angular
magnetoresistance of CPP spin valves taking the spin accumulation in the
ferromagnetic layers into accoun... | 0107250v1 |
2001-07-27 | Large magnetoresistance using hybrid spin filter devices | A magnetic "spin filter" tunnel barrier, sandwiched between a non-magnetic
metal and a magnetic metal, is used to create a new magnetoresistive tunnel
device, somewhat analogous to an optical polarizer-analyzer configuration. The
resistance of these trilayer structures depends on the relative magnetization
orientation ... | 0107571v1 |
2001-08-17 | Negative Magneto-Resistance Beyond Weak Localization in Three-Dimensional Billiards: Effect of Arnold Diffusion | We investigate a semiclassical conductance for ballistic open
three-dimensional (3-d) billiards. For partially or completely broken-ergodic
3-d billiards such as SO(2) symmetric billiards, the dependence of the
conductance on the Fermi wavenumber is dramatically changed by the lead
orientation. Application of a symmetr... | 0108276v1 |
2001-08-29 | Anomalous Co-site substitution effects on the physical properties of the thermoelectric oxide NaCo2O4 | We prepared polycrystalline samples of NaCo2-xMxO4 substituted for the Co
site by other 3d or 4d elements (M=Mn,Cu, Zn, Ru, Rh, and Pd). While some of
the elements (M=Mn,Ru and Rh) act as a strong scatterer to give rise to a rapid
increase in resistivity, the others (M=Cu, Zn and Pd) do not deteriorate the
electric con... | 0108485v1 |
2001-10-05 | Successive Phase Transitions in a Metal-Ordered Manganite Perovskite YBaMn2O6 | Structural, magnetic and electric properties of a metal-ordered perovskite
YBaMn2O6 have been studied by means of powder X-ray diffraction, DSC, magnetic
susceptibility, and electric resistivity. It is found that this material
undergoes a 1st order structural phase transition at Tc1=520 K, from a pseudo
orthorhombic (m... | 0110114v1 |
2002-04-29 | Nonlinear charging, and transport times in doped nanotubes junctions | The nonlinear capacitance in doped nanotube junctions is calculated self
consistently. It decreases as a function of the applied bias when the latter
becomes larger than the pseudogap of the nanotube. For this device, one can
deduce a relaxation time of about 0.1 femtosecond. Because of its negative
differential resist... | 0204609v3 |
2002-06-24 | Boltzmann theory of engineered anisotropic magnetoresistance in (Ga,Mn)As | We report on a theoretical study of dc transport coefficients in (Ga,Mn)As
diluted magnetic semiconductor ferromagnets that accounts for quasiparticle
scattering from ionized Mn$^{2+}$ acceptors with a local moment $S=5/2$ and
from non-magnetic compensating defects. In metallic samples Boltzmann transport
theory with G... | 0206416v1 |
2002-07-16 | Carbon Nanotubes as Schottky Barrier Transistors | We show that carbon nanotube transistors operate as unconventional "Schottky
barrier transistors", in which transistor action occurs primarily by varying
the contact resistance rather than the channel conductance. Transistor
characteristics are calculated for both idealized and realistic geometries, and
scaling behavio... | 0207397v1 |
2002-09-13 | Some Thermal and Electrical Properties of Candelilla Wax | We report the values of some thermal and electrical properties of Candelilla
Wax (euphorbia cerifera). The open-cell photoacoustic technique and another
photothermic technique - based on the measure of the temperature decay of a
heated sample - were employed to obtain the thermal diffusivity ($\alpha_{s} =
0.026 \pm 0.... | 0209328v1 |
2002-09-25 | Magnetic properties of Ni2.18Mn0.82Ga Heusler alloys with a coupled magnetostructural transition | Polycrystalline Ni2.18Mn0.82Ga Heusler alloys with a coupled
magnetostructural transition are studied by differential scanning calorimetry,
magnetic and resistivity measurements. Coupling of the magnetic and structural
subsystems results in unusual magnetic features of the alloy. These uncommon
magnetic properties of N... | 0209574v1 |
2002-10-04 | The Effects of the Misfit Structure on Thermoelectric Properties of Bi2-xPbxSr2Co2Oy Single Crystals | In-plane anisotropy of the resistivity and thermopower was measured for
single crystal Bi2-xPbxSr2Co2Oy. There is large in-plane anisotropy, which is
attributed to the anisotropic pseudogap formation due to the different crystal
symmetry between the square Bi2Sr2O4 layer and the triangular CuO2 layer. The
magnitude of ... | 0210087v1 |
2002-10-21 | Competing SDW Phases and Quantum Oscillations in (TMTSF)2ClO4 in Magnetic Field | We propose a new approach for studying spin density waves (SDW) in the
Bechgaard salt (TMTSF)2ClO4 where lattice is dimerized in transverse direction
due to anion ordering. The SDW response is calculated in the matrix formulation
that rigorously treats the hybridization of inter-band and intra-band SDW
correlations. Si... | 0210452v1 |
2002-10-28 | Fine "mist" vs large droplets in phase separated manganites | The properties of phase-separated systems, e.g. manganites, close to a I
order phase transition between charge-ordered insulator and ferromagnetic
metal, are usually described by the percolation picture. We argue that the
correlated occupation of metallic sites leads to the preferential formation of
larger metallic clu... | 0210616v1 |
2002-11-12 | Infrared properties of W-doped charge-density-wave material K$_{0.3}$MoO$_3$ | The optical conductivity spectra of quasi-one dimensional compounds
K$_{0.3}$Mo$_{1-x}$W$_x$O$_3$ (x=0, 0.03 and 0.15) have been studied over broad
frequencies. While the dc resistivity measurements indicate no sign of CDW
transition in heavily W-doped blue bronze, the optical conductivity spectra
still show a single p... | 0211225v1 |
2002-11-18 | Anomalous Hall Effect of Reentrant Spin Glass System Fe1-xAlx (x ~ 0.3) | The anomalous Hall coefficient Rs has been studied for the reentrant spin
glass system Fe0.7Al0.3 by measuring the magnetization M and the Hall
resistivity r_H. We have found that R_s exhibits anomalous temperature
dependence at the spin-glass transition temperature T_G, indicating that an
additional term appears along... | 0211368v1 |
2002-12-01 | The superconducting gap of \QTR{em}{in situ} $MgB_{2}$ thin films by microwave surface impedance measurements | Precision measurements of the microwave surface resistance $R_{s}$ of in situ
$MgB_{2}$ films directly reveal an exponential behavior of $R_{s}$ at low
temperature indicating a fully-gapped order parameter. The entire temperature
dependence of $R_{s}$ is well described by a Mattis-Bardeen formalism but with
a small gap... | 0212009v1 |
2002-12-09 | Conductance switching in a molecular device: the role of sidegroups and intermolecular interactio | We report first-principles studies of electronic transport in monolayers of
Tour wires functionalized with different side groups. An analysis of the
scattering states and transmission eigenchannels suggests that the
functionalization does not strongly affect the resonances responsible for
current flow through the monol... | 0212191v1 |
2003-04-24 | The spin-torque transistor | A magnetoelectronic thin-film transistor is proposed that can display
negative differential resistance and gain. The working principle is the
modulation of the soure-drain current in a spin valve by the magnetization of a
third electrode, which is rotated by the spin-torque created by a control
spin-valve. The device c... | 0304550v1 |
2003-05-27 | Double Magnetic Transition in Pr0.5Sr0.5CoO3 | We report studies of polycrystalline samples of the metallic ferromagnet
Pr0.5Sr0.5CoO3 through measurements of the magnetization, a.c. magnetic
susceptibility, resistivity, and specific heat. We find an unusual anomaly
around TA = 120 K, much below the ferromagnetic transition (TC = 226 K). The
anomaly is manifested i... | 0305621v1 |
2003-06-08 | Analysis Of Critical Power Loss In A Superconductor | A critical power dissipation resulting from an oscillating magnetic field, Hp
cos wt, can produce a magnetic breakdown field, H <Hc, the critical field of
the superconductor. The analysis shows, for example, why the breakdown field of
a superconducting microwave cavity can be well below Hc in some cases, and
indicates ... | 0306202v1 |
2003-07-11 | Enhanced thermoelectric properties of NaxCoO2 whisker crystals | Single-crystalline whiskers of thermoelectric cobalt oxide, NaxCoO2, have
been grown by an unconventional method from potassium-containing compositions,
and their transport properties, and chemical compositions were determined. The
growth mechanism was analyzed and interpreted by means of thermogravimetric
analysis. At... | 0307277v1 |
2003-07-31 | Reflection of electrons from a domain wall in magnetic nanojunctions | Electronic transport through thin and laterally constrained domain walls in
ferromagnetic nanojunctions is analyzed theoretically. The description is
formulated in the basis of scattering states. The resistance of the domain wall
is calculated in the regime of strong electron reflection from the wall. It is
shown that ... | 0307765v1 |
2003-08-16 | Frequency Dependence of Superconducting Cavity Q and Magnetic Breakdown Field | A theoretical explanation is given to account for the unexpected observation
that L- and S-band Nb superconducting cavities were found to have lower Q and
lower magnetic breakdown field than those of the higher X-band frequencies.
Both effects can be related to the trapping of magnetic flux in the cavity
walls. The fre... | 0308324v1 |
2003-08-22 | Relevance of Cooperative Lattice Effects and Correlated Disorder in Phase-Separation Theories for CMR Manganites | Previous theoretical investigations of colossal magnetoresistance (CMR)
materials explain this effect using a ``clustered'' state with preformed
ferromagnetic islands that rapidly align their moments with increasing external
magnetic fields. While qualitatively successful, explicit calculations indicate
drastically dif... | 0308456v1 |
2003-09-13 | Metal-insulator transition in Ca_{1-x}Li_xPd_3O_4 | Metal-insulator transition in Ca_{1-x}Li_xPd_3O_4 has been studied through
charge transport measurements. The resistivity, the Seebeck coefficient, and
the Hall coefficient are consistently explained in terms of a simple one-band
picture, where a hole with a moderately enhanced mass is itinerant
three-dimensionally. Co... | 0309335v1 |
2003-10-10 | Charge transport in l-DNA probed by conducting-AFM, and relationship with its structure | We studied the electrical conductivity of DNA samples as function of the
number of DNA molecules. We showed that the insulating gap (no current at low
voltage) increases from ~1-2 V for bundles and large ropes to ~4-7 V for few
DNA molecules. From the distance dependent variation of the current, a unique
hopping distan... | 0310242v1 |
2003-12-18 | Spin momentum transfer in current perpendicular to the plane spin valves | We present experimental and numerical micromagnetic data on the effect of
spin momentum transfer in current perpendicular to the plane spin valves.
Starting from a configuration with orthogonal free and pinned layer
magnetizations, the free layer magnetization exhibits abrupt current induced
switching that is qualitati... | 0312505v1 |
2004-03-24 | New Pyrochlore Oxide Superconductor RbOs2O6 | We report the discovery of a new pyrochlore oxide superconductor RbOs2O6. The
compound crystallizes in the same beta-pyrochlore structure as the recently
discovered superconductor KOs2O6, where Os atoms form a corner-sharing
tetrahedral network called the pyrochlore lattice with Rb or K atoms in the
cage. Resistivity, ... | 0403601v2 |
2004-04-16 | Quenched growth of nanostructured lead thin films on insulating substrates | Lead island films were obtained via vacuum vapor deposition on glass and
ceramic substrates at 80 K. Electrical conductance was measured during vapor
condensation and further annealing of the film up to room temperature. The
resistance behavior during film formation and atomic force microscopy of
annealed films were us... | 0404393v2 |
2004-04-28 | Current-induced magnetization reversal in a (Ga,Mn)As-based magnetic tunnel junction | We report current-induced magnetization reversal in a ferromagnetic
semiconductor-based magnetic tunnel junction (Ga,Mn)As/AlAs/(Ga,Mn)As prepared
by molecular beam epitaxy on a p-GaAs(001) substrate. A change in
magneto-resistance that is asymmetric with respect to the current direction is
found with the excitation cu... | 0404663v1 |
2004-04-30 | Spin-dependent transport in molecular tunnel junctions | We present measurements of magnetic tunnel junctions made using a
self-assembled-monolayer molecular barrier. Ni/octanethiol/Ni samples were
fabricated in a nanopore geometry. The devices exhibit significant changes in
resistance as the angle between the magnetic moments in the two electrodes is
varied, demonstrating t... | 0404740v1 |
2004-08-07 | Hystersis like behaviour in Thin Films with heating-cooling cycle | The expression of temperature distribution along a film thickness is derived
and distribution of temperature in the film as the substrate is heated is
shown. The variation of film resistance with different substrate temperature is
calculated and the existence of temperature gradient along the film thickness
with finite... | 0408163v1 |
2004-10-12 | Quasi-ballistic electron transport in double-wall carbon nanotubes | Room-temperature quasi-ballistic electron transport in double-wall carbon
nanotubes (DWNT) is demonstrated. Conductance dependence on the length was
measured by submerging DWNTs into liquid mercury. The conductance plots show
plateaus, indicating weak dependence of the electrode-tube-electrode electrical
resistance on ... | 0410310v1 |
2004-11-07 | Sub 20 nm Short Channel Carbon Nanotube Transistors | Carbon nanotube field-effect transistors with sub 20 nm long channels and
on/off current ratios of > 1000000 are demonstrated. Individual single-walled
carbon nanotubes with diameters ranging from 0.7 nm to 1.1 nm grown from
structured catalytic islands using chemical vapor deposition at 700 degree
Celsius form the cha... | 0411177v1 |
2004-11-11 | Ferromagnetic-superconducting hybrid films and their possible applications: A direct study in a model combinatorial film | Model combinatorial films (CFs) which host a pure superconductor adjacent to
a ferromagneticsuperconducting hybrid film (HF) are manufactured for the study
of the influence of ferromagnetic nanoparticles (FNs) on the nucleation of
superconductivity. Careful resistance measurements were performed
simultaneously on two d... | 0411311v1 |
2004-12-20 | Carbon Nanotubes for Interconnect Applications | We briefly review the status of the application of carbon nanotubes (CNTs)
for future interconnects and present results concerning possible integration
schemes. Growth of single nanotubes at lithographically defined locations
(vias) has been achieved which is a prerequisite for the use of CNTs as future
interconnects. ... | 0412537v1 |
2005-01-12 | Nanoengineered Curie Temperature in Laterally-Patterned Ferromagnetic Semiconductor Heterostructures | We demonstrate the manipulation of the Curie temperature of buried layers of
the ferromagnetic semiconductor (Ga,Mn)As using nanolithography to enhance the
effect of annealing. Patterning the GaAs-capped ferromagnetic layers into
nanowires exposes free surfaces at the sidewalls of the patterned (Ga,Mn)As
layers and thu... | 0501298v2 |
2005-01-29 | Spin accumulation and decay in magnetic Schottky barriers | The theory of charge and spin transport in forward-biased Schottky barriers
reveals characteristic and experimentally relevant features. The conductance
mismatch is found to enhance the current induced spin-imbalance in the
semiconductor. The GaAs|MnAs interface resistance is obtained from an analysis
of the magnetic f... | 0501726v1 |
2005-02-01 | Adsorption of Oxygen Molecules on Individual Carbon Single-walled Nanotubes | Our study of the adsorption of oxygen molecules on individual semiconductiong
single-walled carbon nanotubes at ambient conditions reveals that the
adsorption is physisorption, that the resistance without O2 increases by ~two
orders of magnitude as compared to that with O2, and that the sensitive
response is due to the... | 0502012v1 |
2005-03-07 | Physical properties, strontium ordering and structural modulation in layered hexagonal Sr0.35CoO2 | Layered Sr0.35CoO2 has been synthesized by means of an ion exchange reaction
from Na0.7CoO2. Resistivity measurements show that this material can be either
metallic or semiconducting depending on the annealing conditions. Magnetic
susceptibility, following the Curie-Weiss law, increases with lowering
temperature and sh... | 0503136v1 |
2005-04-12 | Polaron Transport in the Paramagnetic Phase of Electron-Doped Manganites | The electrical resistivity, Hall coefficient, and thermopower as functions of
temperature are reported for lightly electron-doped Ca(1-x)La(x)MnO(3)(0 <= x
<= 0.10). Unlike the case of hole-doped ferromagnetic manganites, the magnitude
and temperature dependence of the Hall mobility for these compounds is found to
be i... | 0504303v1 |
2005-04-26 | Spin filtering through ferromagnetic BiMnO3 tunnel barriers | We report on experiments of spin filtering through ultra-thin single-crystal
layers of the insulating and ferromagnetic oxide BiMnO3 (BMO). The spin
polarization of the electrons tunneling from a gold electrode through BMO is
analyzed with a counter-electrode of the half-metallic oxide La2/3Sr1/3MnO3
(LSMO). At 3 K we ... | 0504667v1 |
2005-05-16 | Electronic mean free path in as-produced and purified single-wall carbon nanotubes | The effect of purification on room temperature electronic transport
properties of single-wall carbon nanotubes (SWNT) was studied by submerging
samples into liquid mercury. The conductance plots of purified SWNTs showed
plateaus, indicating weak dependence of the electrical resistance on the length
of the tube connecti... | 0505377v1 |
2005-06-03 | Magnetic and Transport Properties of Fe-Ag granular multilayers | Results of magnetization, magnetotransport and Mossbauer spectroscopy
measurements of sequentially evaporated Fe-Ag granular composites are
presented. The strong magnetic scattering of the conduction electrons is
reflected in the sublinear temperature dependence of the resistance and in the
large negative magnetoresist... | 0506072v2 |
2005-07-06 | A single molecule switch based on two Pd nanocrystals linked by a conjugated dithiol | Tunneling spectroscopy measurements have been carried out on a single
molecule device formed by two Pd nanocrystals (dia, $\sim$5 nm) electronically
coupled by a conducting molecule, dimercaptodiphenylacetylene. The I-V data,
obtained by positioning the tip over a nanocrystal electrode, exhibit negative
differential re... | 0507147v1 |
2005-07-15 | Spin transference and magnetoresistance amplification in a transistor | A current problem in semiconductor spin-based electronics is the difficulty
of experimentally expressing the effect of spin-polarized current in electrical
circuit measurements. We present a theoretical solution with the principle of
transference of the spin diffusion effects in the semiconductor channel of a
system wi... | 0507378v2 |
2005-09-27 | Electron-Hole Asymmetry in GdBaCo_{2}O_{5+x}: Evidence for Spin Blockade of Electron Transport in a Correlated Electron System | In RBaCo_{2}O_{5+x} compounds (R is rare earth) variability of the oxygen
content allows precise doping of CoO_2 planes with both types of charge
carriers. We study transport properties of doped GdBaCo_{2}O_{5+x} single
crystals and find a remarkable asymmetry in the behavior of holes and electrons
doped into a parent ... | 0509673v1 |
2005-10-13 | The electrical current effect in phase separated La5/8-yPryCa3/8MnO3: Charge order melting vs. Joule heating | We have studied the effect of electric field on transport properties of the
prototypical phase separated manganite La5/8-yPryCa3/8MnO3 with y=0.34. Our
results show that the suggested image in which the charge ordered state is
melted by the appliance of an electric current and/or voltage has to be
revised. We were able... | 0510366v1 |
2005-12-16 | A possible minimum toy model with negative differential capacitance for self-sustained current oscillation | We generalize a simple model for superlattices to include the effect of
differential capacitance. It is shown that the model always has a stable
steady-state solution (SSS) if all differential capacitances are positive. On
the other hand, when negative differential capacitance is included, the model
can have no stable ... | 0512370v2 |
2006-01-13 | Gamma radiation exposure of MCT diode arrays | Investigations of electrical properties of long-wavelength infrared (LWIR)
mercury cadmium telluride (MCT) arrays exposed to gamma-radiation have been
performed. Resistance-area product characteristics of LWIR n{+}-p photodiodes
have been investigated using microprobe technique at T=78 K before and after an
exposure to... | 0601276v1 |
2006-01-13 | Influence of Roughness and Disorder on Tunneling Magnetoresistance | A systematic, quantitative study of the effect of interface roughness and
disorder on the magnetoresistance of FeCo$|$vacuum$|$FeCo magnetic tunnel
junctions is presented based upon parameter-free electronic structure
calculations. Surface roughness is found to have a very strong effect on the
spin-polarized transport ... | 0601291v2 |
2006-02-09 | Strong Pinning Enhancement in MgB2 Using Very Small Dy2O3 Additions | 0.5 to 5.0 wt.% Dy2O3 was in-situ reacted with Mg + B to form pinned MgB2.
While Tc remained largely unchanged, Jc was strongly enhanced. The best sample
(only 0.5 wt.% Dy2O3) had a Jc of 6.5 x 10^5 A/cm^2 at 6K, 1T and 3.5 x 10^5
A/cm^2 at 20K, 1T, around a factor of 4 higher compared to the pure sample, and
equivalen... | 0602234v1 |
2006-02-27 | Origin of the large thermoelectric power in oxygen-variable RBaCo_{2}O_{5+x} (R=Gd, Nd) | Thermoelectric properties of GdBaCo_{2}O_{5+x} and NdBaCo_{2}O_{5+x} single
crystals have been studied upon continuous doping of CoO_2 planes with either
electrons or holes. The thermoelectric response and the resistivity behavior
reveal a hopping character of the transport in both compounds, providing the
basis for un... | 0602618v1 |
2006-03-27 | Modeling transient absorption and thermal conductivity in a simple nanofluid | Molecular dynamics simulations are used to simulate the thermal properties of
a model fluid containing nanoparticles (nanofluid). By modelling transient
absorption experiments, we show that they provide a reliable determination of
interfacial resistance between the particle and the fluid. The flexibility of
molecular s... | 0603704v1 |
2006-05-04 | Optical conductivity of charge carriers interacting with a two-level systems reservoir | Using the functional-integral method we investigate the effective dynamics of
a charged particle coupled to a set of two-level systems as a function of
temperature and external electric field. The optical conductivity and the
direct current (dc) resistivity induced by the reservoir are computed. Three
different regimes... | 0605105v1 |
2006-05-24 | Controlling charge injection in organic field-effect transistors using self-assembled monolayers | We have studied charge injection across the metal/organic semiconductor
interface in bottom-contact poly(3-hexylthiophene) (P3HT) field-effect
transistors, with Au source and drain electrodes modified by self-assembled
monolayers (SAMs) prior to active polymer deposition. By using the SAM to
engineer the effective Au w... | 0605605v1 |
2006-08-10 | Gate-controlled nuclear magnetic resonance in an AlGaAs/GaAs quantum Hall device | We study the resistively detected nuclear magnetic resonance (NMR) in an
AlGaAs/GaAs quantum Hall device with a side gate. The strength of the hyperfine
interaction between electron and nuclear spins is modulated by tuning a
position of the two-dimensional electron systems with respect to the polarized
nuclear spins us... | 0608237v1 |
2006-08-27 | Magnetic Switching of Phase-Slip Dissipation in NbSe2 Nanobelts | The stability of the superconducting dissipationless and resistive states in
single-crystalline NbSe2 nanobelts is characterized by transport measurements
in an external magnetic field (H). Current-driven electrical measurements show
voltage steps, indicating the nucleation of phase-slip structures. Well below
the crit... | 0608586v1 |
2006-08-28 | Inverse Spin Hall Effect by Spin Injection | Motivated by a recent experiment[Nature {\bf 442}, 176 (2006)], we present a
quantitative microscopic theory to investigate the inverse spin-Hall effect
with spin injection into aluminum considering both intrinsic and extrinsic
spin-orbit couplings using the orthogonalized-plane-wave method. Our
theoretical results are... | 0608594v2 |
2006-08-31 | Atomic and electronic structure of ultra-thin Al/AlOx/Al interfaces | Interfaces between metals based on AlO$_{x}$ represent the most popular basis
for Josephson junctions or, more recently, also for junctions exhibiting
substantial tunneling magneto-resistance. We have performed a computational
study of possible local geometric structures of such interfaces at the
ab-initio DFT/GGA leve... | 0608718v1 |
2006-09-01 | Nonlinear screening of charge impurities in graphene | It is shown that a ``vacuum polarization'' induced by Coulomb potential in
graphene leads to a strong suppression of electric charges even for undoped
case (no charge carriers). A standard linear response theory is therefore not
applicable to describe the screening of charge impurities in graphene. In
particular, it ov... | 0609026v3 |
2006-09-14 | Strain induced pressure effect in pulsed laser deposited thin films of the strongly correlated oxide V2O3 | V2O3 thin films about 10 nm thick were grown on Al2O3 (0001) by pulsed laser
deposition. The XRD analysis is in agreement with R-3c space group. Some of
them exhibit the metal / insulator transition characteristic of V2O3 bulk
material and others samples exhibit a metallic behavior. For the latter, the
XPS analysis ind... | 0609342v1 |
2006-09-19 | Adaptive Programming of Unconventional Nano-Architectures | Novel assembly processes for nanocircuits could present compelling
alternatives to the detailed design and placement currently used for computers.
The resulting architectures however may not be programmable by standard means.
In this paper, nanocomputers with unconventional architectures are programmed
using adaptive m... | 0609489v1 |
2006-09-20 | Spin Injection and Nonlocal Spin Transport in Magnetic Nanostructures | We theoretically study the nonlocal spin transport in a device consisting of
a nonmagnetic metal (N) and ferromagnetic injector (F1) and detector (F2)
electrodes connected to N. We solve the spin-dependent transport equations in a
device with arbitrary interface resistance from a metallic-contact to tunneling
regime, a... | 0609508v1 |
2006-09-21 | Resistive and rectifying effects of pulling gold atoms at thiol-gold nano-contacts | We investigate, by means of first-principles calculations, structural and
transport properties of junctions made of symmetric dithiolated molecules
placed between Au electrodes. As the electrodes are pulled apart, we find that
it becomes energetically favorable that Au atoms migrate to positions between
the electrode s... | 0609558v1 |
2006-11-15 | Tunneling anisotropic magnetoresistance and spin-orbit coupling in Fe/GaAs/Au tunnel junctions | We report the observation of tunneling anisotropic magnetoresistance effect
(TAMR) in the epitaxial metal-semiconductor system Fe/GaAs/Au. The observed
two-fold anisotropy of the resistance can be switched by reversing the bias
voltage, suggesting that the effect originates from the interference of the
spin-orbit coupl... | 0611406v1 |
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