publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
|---|---|---|---|
2002-07-05 | On the two-dimensional metallic state in silicon-on-insulator structures | It is shown that the electronic conduction in silicon-on-insulator (SOI)
layers exhibits a metallic regime which is very similar to that in
high-mobility Si-metal oxide semiconductor structures (MOS). The peak in the
electron mobility versus density, the strong drop in resistivity and the
critical concentration for the... | 0207170v1 |
2003-01-21 | Angular dependence of domain wall resistivity in SrRuO$_{\bf 3}$ films | ${\rm SrRuO_3}$ is a 4d itinerant ferromagnet (T$_{c}$ $\sim $150 K) with
stripe domain structure. Using high-quality thin films of SrRuO$_{3}$ we study
the resistivity induced by its very narrow ($\sim 3$ nm) Bloch domain walls,
$\rho_{DW}$ (DWR), at temperatures between 2 K and T$_{c}$ as a function of the
angle, $\t... | 0301400v2 |
2003-04-30 | Radiation-induced magnetoresistance oscillation in a two-dimensional electron gas in Faraday geometry | Microwave-radiation induced giant magnetoresistance oscillations recently
discovered in high-mobility two-dimensional electron systems in a magnetic
field, are analyzed theoretically. Multiphoton-assisted impurity scatterings
are shown to be the primary origin of the oscillation. Based on a model which
considers the in... | 0304687v2 |
2003-06-03 | Signatures of valence fluctuations in CeCu2Si2 under high pressure | Simultaneous resistivity and a.c.-specific heat measurements have been
performed under pressure on single crystalline CeCu2Si2 to over 6 GPa in a
hydrostatic helium pressure medium. A series of anomalies were observed around
the pressure coinciding with a maximum in the superconducting critical
temperature, $T_c^{max}$... | 0306054v1 |
2003-06-09 | Thermal fluctuations in ultrasmall intrinsic Josephson junctions | Current-voltage curves of small area hysteretic intrinsic Josephson
junctions, for which the Josephson energy $E_J=\hbar J_c/2e$ is of order of
thermal energy $kT$, are investigated. A non-monotonic temperature dependence
of the switching current is observed and explained by thermal phase
fluctuations. At low temperatu... | 0306212v1 |
2003-11-25 | Comparative study of in situ and ex situ MgB2 films deposited by pulsed laser deposition | Two types of MgB2 films were prepared by pulsed laser deposition (PLD) with
in situ and ex situ annealing processes respectively. Significant differences
in properties between the two types of films were found. The ex situ MgB2 film
has a Tc of 38.1K, while the in situ film has a depressed Tc of 34.5K. The
resistivity ... | 0311556v1 |
2004-02-12 | Self-localization of holes in a lightly doped Mott insulator | We show that lightly doped holes will be self-trapped in an antiferromagnetic
spin background at low-temperatures, resulting in a spontaneous translational
symmetry breaking. The underlying Mott physics is responsible for such novel
self-localization of charge carriers. Interesting transport and dielectric
properties a... | 0402327v2 |
2004-03-09 | Resistivity and Thermopower of Ni2.19Mn0.81Ga | In this paper, we report results of the first studies on the thermoelectric
power (TEP) of the magnetic heusler alloy Ni$_{2.19}$Mn$_{0.81}$Ga. We explain
the observed temperature dependence of the TEP in terms of the crystal field
(CF) splitting and compare the observed behavior to that of the stoichiometric
system Ni... | 0403232v2 |
2004-07-21 | YbNiSi3: a new antiferromagnetic Kondo lattice with strong exchange interaction | We report on the structural, thermodynamic and transport properties of
high-quality single crystals of YbNiSi3 grown by the flux method. This compound
crystallizes in the SmNiGe3 layered structure type of the Cmmm space group. The
general physical behavior is that of a Kondo lattice showing an
antiferromagnetic ground ... | 0407543v1 |
2004-09-05 | Infrared study of giant dielectric constant in Li and Ti doped NiO | We have measured optical reflectivity of Li and Ti doped NiO (LTNO) in the
infrared range at various temperatures. A Drude-like absorption is found at low
energy, $\omega <$ 100 cm$^{-1}$ and its spectral weight increases
substantially as temperature decreases. This observation and DC-resistivity
result show that LTNO ... | 0409105v1 |
2004-09-09 | Anomalous Pressure Dependence of Kadowaki-Woods ratio and Crystal Field Effects in Mixed-valence YbInCu4 | The mixed-valence (MV) compound YbInCu4 was investigated by electrical
resistivity and ac specific heat at low temperatures and high pressures. At
atmospheric pressure, its Kadowaki-Woods (KW) ratio, A/\gamma ^2, is 16 times
smaller than the universal value R_{KW}(=1.0 x 10^-5 \mu \Omega cm mol^2 K^2
mJ^-2), but sharpl... | 0409243v2 |
2004-10-01 | Inherent Relation between Nernst Signal and Nodal Quasiparticle Transport in Pseudogap Region of Underdoped High Temperature Superconductors | In-plane Nernst signal and resistivity have been measured for three
$La_{2-x}Sr_xCuO_4$ single crystals (x=0.09, 0.11 and 0.145) with the magnetic
field parallel to c-axis. A quadratic temperature dependence of resistivity,
i.e., $\rho=\rho_0+aT^2$ is observed below a certain temperature $T_R$. It is
found that the upp... | 0410013v2 |
2004-11-23 | Magnetic field-tuned quantum critical point in CeAuSb_2 | Transport, magnetic and thermal properties at high magnetic fields (H) and
low temperatures (T) of the heavy fermion compound CeAuSb_2 are reported. At
H=0 this layered system exhibits antiferromagnetic order below T_N = 6 K.
Applying B along the inter-plane direction, leads to a continuous suppression
of T_N and a qua... | 0411588v2 |
2005-02-14 | Superconductivity induced by spark erosion in ZrZn2 | We show that the superconductivity observed recently in the weak itinerant
ferromagnet ZrZn2 [C. Pfleiderer et al., Nature (London) 412, 58 (2001)] is due
to remnants of a superconducting layer induced by spark erosion. Results of
resistivity, susceptibility, specific heat and surface analysis measurements on
high-qual... | 0502341v2 |
2005-04-05 | Interaction and disorder in bilayer counterflow transport at filling factor one | We study high mobility, interacting GaAs bilayer hole systems exhibiting
counterflow superfluid transport at total filling factor $\nu=1$. As the
density of the two layers is reduced, making the bilayer more interacting, the
counterflow Hall resistivity ($\rho_{xy}$) decreases at a given temperature,
while the counterf... | 0504119v1 |
2005-05-19 | On the problem of the Kondo-lattice model application to CeB6 | Precision measurements of charge transport parameters (resistivity, Hall and
Seebeck coefficients) have been carried out on high-quality single-crystals of
cerium hexaboride in a wide temperature range 1.8-300 K. It is shown that in
the temperature interval of 5 K < T < T* = 80 K the magnetic contribution in
resistivit... | 0505475v1 |
2005-06-15 | Resistivity study of the pseudogap phase for (Hg,Re) - 1223 superconductors | The pseudogap phase above the critical temperature of high $T_{c}$
superconductors (HTSC) presents different energy scales and it is currently a
matter of intense study. The complexity of the HTSC normal state requires very
accurate measurements with the purpose of distinguishing different types of
phenomena. Here we h... | 0506387v2 |
2005-08-29 | Universal Minimum Heat Leak on Low-Temperature Metallic Electrical Leads | Low-temperature electronic systems require electrical leads which have low
electrical resistance to provide bias current I without excessive voltage drop
V. But proper cryogenic design also requires high thermal resistance to
maintain a minimum heat leak Q from the hot temperature T[hot] to the cold
temperature T[cold]... | 0508697v2 |
2005-09-01 | Comment on "Magnetic quantum oscillations of the conductivity in layered conductors" | We discuss the recent theory of Gvozdikov [Phys. Rev. B 70, 085113 (2004)]
which aims at explaining the Shubnikov-de Haas oscillations of the longitudinal
resistivity \rho_zz observed in the quasi-two-dimensional organic compound
\beta''-(BEDT-TTF)_2SF_5CH_2CF_2SO_3.
We point out that the self-consistent equations of... | 0509026v2 |
2005-10-14 | Ferromagnetic Properties of ZrZn$_2$ | The low Curie temperature (T_C approx 28K) and small ordered moment (M_0
approx 0.17 mu_B f.u.^-1) of ZrZn2 make it one of the few examples of a weak
itinerant ferromagnet. We report results of susceptibility, magnetization,
resistivity and specific heat measurements made on high-quality single crystals
of ZrZn2. From ... | 0510384v1 |
2005-12-23 | Spin-charge gauge symmetry: A way to tackle HTS cuprates? | We propose an explanation of several experimental features of transport
phenomena in the normal state of high Tc cuprates in terms of a spin-charge
gauge theory of the 2D t-J model. The calculated doping-temperature dependence
for a number of physical quantities is found in qualitative agreement with
data. In particula... | 0512607v1 |
2006-02-01 | Coulomb blockade and transport in a chain of one-dimensional quantum dots | A long one-dimensional wire with a finite density of strong random impurities
is modelled as a chain of weakly coupled quantum dots. At low temperature T and
applied voltage V its resistance is limited by "breaks": randomly occuring
clusters of quantum dots with a special length distribution pattern that
inhibits the t... | 0602008v3 |
2006-02-14 | Intrinsic nonlinearity probed by intermodulation distortion microwave measurements on high quality MgB2 thin films | The two tone intermodulation distortion arising in MgB2 thin films
synthesized by hybrid physical-chemical vapour deposition is studied in order
to probe the influence of the two bands on the nonlinear response of this
superconductor. The measurements are carried out by using a dielectrically
loaded copper cavity opera... | 0602340v1 |
2006-02-21 | Evidence of s-wave pairing symmetry in layered superconductor Li$_{0.68}$NbO$_2$ from the specific heat measurement | A high quality superconducting Li$_{0.68}$NbO$_2$ polycrystalline sample was
synthesized by deintercalation of Li ions from Li$_{0.93}$NbO$_2$. The field
dependent resistivity and specific heat were measured down to 0.5 K. The upper
critical field $H_{c2} (T)$ is deduced from the resistivity data and
$H_{c2}(0)$ is est... | 0602476v1 |
2006-03-29 | Resistivity and Magneto-Optical Evidence for Variable and Incomplete Connectivity in Dense, High Critical Current Density C-alloyed Magnesium Diboride | Carbon-doped magnesium diboride was fabricated from pre-reacted pure MgB2 by
mechanical alloying. The sample set had excellent critical current densities
Jc(8T,4.2K) ranging from 15-60 kA/cm2, depending on composition.
Magneto-optical imaging detected regions up to 0.5 mm in size which were nearly
100% dense with Jc 2-... | 0603800v1 |
2006-06-08 | Periodic Oscillations of Josephson-Vortex Flow Resistance in Oxygen-Deficient Y1Ba2Cu3Ox | We measured the Josephson vortex flow resistance as a function of magnetic
field applied parallel to the ab-planes using annealed Y1Ba2Cu3Ox intrinsic
Josephson junctions having high anisotropy (around 40) by oxygen content
reduction. Periodic oscillations were observed in magnetic fields above 45-58
kOe, corresponding... | 0606202v2 |
2006-06-26 | Flux-flow resistivity anisotropy in the instability regime in the a-b plane of epitaxial YBCO thin films | Measurements of the nonlinear flux-flow resistivity $\rho$ and the critical
vortex velocity $\rm v^*_\phi$ at high voltage bias close to the instability
regime predicted by Larkin and Ovchinnikov \cite{LO} are reported along the
node and antinode directions of the d-wave order parameter in the \textit{a-b}
plane of epi... | 0606667v1 |
2006-07-01 | Nonlocal Effect of Local Nonmagnetic Impurity in High-Tc Superconductors: Induced Local Moment and Huge Residual Resistivity | We study a Hubbard model with a strong onsite impurity potential based on an
improved fluctuation-exchange (FLEX) approximation, which we call the GVI-FLEX
method. We find that (i) both local and staggered susceptibilities are strongly
enhanced around the impurity. By this reason, (ii) the quasiparticle lifetime
as wel... | 0607011v1 |
2006-07-21 | Vortex state microwave resistivity in Tl-2212 thin films | We present measurements of the field induced changes in the 47 GHz complex
resistivity, $\Delta \tilde \rho(H,T)$, in Tl$_{2}$Ba$_{2}$CaCu$_{2}$O$_{8+x}$
(TBCCO) thin films with $T_{c}\simeq$ 105 K, prepared on CeO$_{2}$ buffered
sapphire substrates. At low fields ($\mu_{0}H<$10 mT) a very small irreversible
feature is... | 0607552v1 |
2006-08-31 | Magnetotransport in a two-dimensional electron system in dc electric fields | We report on nonequilibrium transport measurements in a high-mobility
two-dimensional electron system subject to weak magnetic field and dc
excitation. Detailed study of dc-induced magneto-oscillations, first observed
by Yang {\em et al}., reveals a resonant condition that is qualitatively
different from that reported ... | 0608727v3 |
2006-10-04 | Quantum phase transition in the heavy-fermion compound YbIr$_2$Si$_2$ | We investigate the pressure-temperature phase diagram of YbIr$_2$Si$_2$ by
measuring the electrical resistivity $\rho(T)$. In contrast to the widely
investigated YbRh$_2$Si$_2$, YbIr$_2$Si$_2$ is a paramagnetic metal below
$p_c\simeq 8$ GPa. Interestingly, a first-order, presumably ferromagnetic,
transition develops at... | 0610126v1 |
2006-11-09 | Small-angle interband scattering as the origin of the $T^{3/2}$ resistivity in MnSi | A possible explanation is given for the anomalous $T^{3/2}$ temperature
dependence of the electrical resistivity of MnSi, which is observed in the
high-pressure paramagnetic state. The unusual Fermi surface of MnSi includes
large open sheets that intersect along the faces of the cubic Brillouin zone.
Close to these int... | 0611236v1 |
2006-12-22 | Transport through normal metal - graphene contacts | Conductance of zigzag interfaces between graphene sheet and normal metal is
investigated in the tight-binding approximation. Boundary conditions, valid for
a variety of scattering problems, are constructed and applied to the normal
metal -- graphene -- normal metal (NGN) junctions. At the Dirac point, the
conductance i... | 0612577v3 |
2007-01-04 | Anomalous Hall Resistance in Bilayer Quantum Hall Systems | We present a microscopic theory of the Hall current in the bilayer quantum
Hall system on the basis of noncommutative geometry. By analyzing the
Heisenberg equation of motion and the continuity equation of charge, we
demonstrate the emergence of the phase current in a system where the interlayer
phase coherence develop... | 0701063v1 |
1995-12-08 | The Complex Structure of 2D Surfaces | The complex structure of a surface generated by the two-dimensional dynamical
triangulation(DT) is determined by measuring the resistivity of the surface. It
is found that surfaces coupled to matter fields have well-defined complex
structures for cases when the matter central charges are less than or equal to
one, whil... | 9512014v1 |
2006-08-07 | Random walk on the incipient infinite cluster for oriented percolation in high dimensions | We consider simple random walk on the incipient infinite cluster for the
spread-out model of oriented percolation on $Z^d \times Z_+$. In dimensions
$d>6$, we obtain bounds on exit times, transition probabilities, and the range
of the random walk, which establish that the spectral dimension of the
incipient infinite cl... | 0608164v2 |
2003-02-21 | New results from an extensive aging test on bakelite Resistive Plate Chambers | We present recent results of an extensive aging test, performed at the CERN
Gamma Irradiation Facility on two single--gap RPC prototypes, developed for the
LHCb Muon System. With a method based on a model describing the behaviour of an
RPC under high particle flux conditions, we have periodically measured the
electrode... | 0302077v2 |
2004-03-09 | Measuring the force ejecting DNA from phage | We discuss how a balance can be established between the force acting to eject
DNA from viral capsids and the force resisting its entry into a colloidal
suspension which mimics the host cell cytoplasm. The ejection force arises from
the energy stored in the capsid as a consequence of the viral genome
(double-stranded DN... | 0403057v1 |
2006-08-04 | Design guide for electronics for resistive charge division in thermal neutron detection | An amplifier has been designed for optimal use of position sensitive thermal
neutron detectors using the principle of resistive charge division. The
important points in this optimization are: high counting rates and good spatial
resolution. This amplifier is built as a hybrid circuit and is now used on
several new inst... | 0608046v1 |
2002-05-20 | A Zoology of Bell inequalities resistant to detector inefficiency | We derive both numerically and analytically Bell inequalities and quantum
measurements that present enhanced resistance to detector inefficiency. In
particular we describe several Bell inequalities which appear to be optimal
with respect to inefficient detectors for small dimensionality d=2,3,4 and 2 or
more measuremen... | 0205130v2 |
2007-05-17 | Incoherent non-Fermi liquid scattering in a Kondo lattice | One of the most notorious non-Fermi liquid properties of both archetypal
heavy-fermion systems [1-4] and the high-Tc copper oxide superconductors [5] is
an electrical resistivity that evolves linearly with temperature, T. In the
heavy-fermion superconductor CeCoIn5 [5], this linear behaviour was one of the
first indica... | 0705.2592v2 |
2007-07-22 | Investigations of a THGEM-based imaging detector | We present the results of our recent studies on a Thick Gas Electron
Multiplier (THGEM)-based imaging detector prototype. It consists of two 100x100
mm^2 THGEM electrodes in cascade, coupled to a resistive anode. The event
location is recorded with a 2D double-sided readout electrode equipped with
discrete delay-lines ... | 0707.3257v3 |
2007-08-13 | Optimized minigaps for negative differential resistance creation in strongly delta-doped (1D) superlattices | The "atomic saw method" uses the passage of dislocations in two-dimensional
(2D) quantum-well superlattices to create periodic slipping layers and
one-dimensional (1D) quantum wire superlattices. The effects of this space
structuring of the samples on the allowed energies are analysed in the case of
GaAs d-doped superl... | 0708.1673v1 |
2007-09-13 | Influence of Mg Deficiency on the Superconductivity in MgB2 Thin Films Grown by using HPCVD | The effects of Mg deficiency in MgB2 films grown by using hybrid
physical-chemical vapor deposition were investigated after vacuum annealing at
various temperatures. High-quality MgB2 films grown on c-cut Al2O3 substrates
with different superconducting transition temperatures (Tc) of 40.2 and 41 K
were used in this stu... | 0709.1989v1 |
2007-12-20 | The evolution of the Non-Fermi Liquid behavior of BaVS$_3$ under high pressure | Temperature, pressure, and magnetic field dependencies of the resistivity of
BaVS$_3$ were measured above the critical pressure of $p_{cr}$=2 GPa, which is
associated with the zero temperature insulator-to-metal (MI) transition. The
resistivity exhibits the $T^n$ temperature dependence below $T_g\approx$15 K,
with $n$ ... | 0712.3393v1 |
2008-02-05 | Verwey transition in Fe$_{3}$O$_{4}$ at high pressure: quantum critical behavior at the onset of metallization | We provide evidence for the existence of a {\em quantum critical point} at
the metallization of magnetite Fe$_{3}$O$_{4}$ at an applied pressure of $p_{c}
\approx 8$ GPa. We show that the present ac magnetic susceptibility data
support earlier resistivity data. The Verwey temperature scales with pressure
$T_{V}\sim (1-... | 0802.0631v1 |
2008-02-20 | Development of bakelite based Resistive Plate Chambers | A Comparative study has been performed on Resistive Plate Chambers made of
different grades of bakelite paper laminates, produced and commercially
available in India. The chambers, operated in the streamer mode using argon :
tetrafluroethane : isobutane in 34:59:7 mixing ratio, are tested with cosmic
rays for the effic... | 0802.2766v1 |
2008-03-06 | Graph Sparsification by Effective Resistances | We present a nearly-linear time algorithm that produces high-quality
sparsifiers of weighted graphs. Given as input a weighted graph $G=(V,E,w)$ and
a parameter $\epsilon>0$, we produce a weighted subgraph
$H=(V,\tilde{E},\tilde{w})$ of $G$ such that $|\tilde{E}|=O(n\log
n/\epsilon^2)$ and for all vectors $x\in\R^V$ $(... | 0803.0929v4 |
2008-03-12 | Bardeen-Stephen flux flow law disobeyed in the high-$T_c$ superconductor Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+δ}$ | Pulsed high current experiments in single crystals of the high-$T_{c}$
superconductor Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ in c-axis directed
magnetic field $H$ reveal that the $ab$-face resistance in the free flux flow
regime is a solely logarithmic function of H, devoid of any power law
component. Re-analysis of ... | 0803.1804v1 |
2008-05-05 | Fast dynamos in weakly ionized gases | The turnover of interstellar gas on $\sim 10^9$yr timescales argues for the
continuous operation of a galactic dynamo. The conductivity of interstellar gas
is so high that the dynamo must be "fast" - i.e. the magnetic field must be
amplified at a rate nearly independent of the magnetic diffusivity. Yet, all
the fast dy... | 0805.0412v1 |
2008-05-26 | Negative differential resistance in molecular junctions: application to graphene ribbon junctions | Using self-consistent calculations based on Non-Equilibrium Green's Function
(NEGF) formalism, the origin of negative differential resistance (NDR) in
molecular junctions and quantum wires is investigated. Coupling of the molecule
to electrodes becomes asymmetric at high bias due to asymmetry between its
highest occupi... | 0805.3980v1 |
2008-06-10 | Are Microwave Induced Zero Resistance States Necessarily Static? | We study the effect of inhomogeneities in Hall conductivity on the nature of
the Zero Resistance States seen in the microwave irradiated two-dimensional
electron systems in weak perpendicular magnetic fields, and we show that
time-dependent domain patterns may emerge in some situations. For an annular
Corbino geometry,... | 0806.1562v1 |
2008-06-13 | Synthesis, crystal structure, microstructure, transport and magnetic properties of SmFeAsO and SmFeAs(O0.93F0.07) | SmFeAsO and the isostructural superconducting SmFeAs(O0.93F0.07) samples were
prepared. Characterization by means of Rietveld refinement of X-ray powder
diffraction data, scanning electron microscope observation, transmission
electron microscope analysis, resistivity and magnetization measurements were
carried out. Sin... | 0806.2205v1 |
2008-07-17 | Photosensitive Strip RETHGEM | An innovative photosensitive gaseous detector, consisting of a GEM like
amplification structure with double layered electrodes (instead of commonly
used metallic ones) coated with a CsI reflective photocathode, is described. In
one of our latest designs, the inner electrode consists of a metallic grid and
the outer one... | 0807.2718v1 |
2008-07-21 | Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2 | EuFe2As2 is a member of the ternary iron arsenide family. Similar to BaFe2As2
and SrFe2As2, EuFe2As2 exhibits a clear anomaly in resistivity near 200 K. It
suggests that EuFe2As2 is another promising parent compound in which
superconductivity may be realized by appropriate doping. Here we report the
discovery of superc... | 0807.3293v3 |
2008-08-03 | Magnetic and Transport Studies on Electron-doped CeFeAsO1-xFx Superconductor | The magnetic and transport behaviors of cerium substituted iron oxy-arsenide
superconductor with x = 0.1 to 0.4 fluoride (F) doping have been investigated
in this report. Temperature dependent susceptibility and resistivity
measurements showed the 0.1 F-doped sample (CeFeAsO0.9F0.1) has a
superconducting transition tem... | 0808.0296v1 |
2008-08-22 | Correlation between extrinsic electroresistance and magnetoresistance in fine-grained La0.7Ca0.3MnO3 | We report our observation of a correlation between the extrinsic
electroresistance (EER) and magnetoresistance (EMR) via grain size in
fine-grained La0.7Ca0.3MnO3. The nature of dependence of EER and EMR on grain
size (~0.2-1.0 micron) indicates that for finer grains with low-resistive
boundaries both of them follow si... | 0808.3043v2 |
2008-09-28 | Scaling of 1/f noise in tunable break-junctions | We have studied the $1/f$ voltage noise of gold nano-contacts in
electromigrated and mechanically controlled break-junctions having resistance
values $R$ that can be tuned from 10 $\Omega$ (many channels) to 10 k$\Omega$
(single atom contact). The noise is caused by resistance fluctuations as
evidenced by the $S_V\prop... | 0809.4841v1 |
2008-10-20 | Polaron relaxation and hopping conductivity in LaMn$_{1-x}$Fe$_{x}$O$_3$ | Dc and ac transport properties as well as electric modulus spectra have been
investigated for the samples LaMn$_{1-x}$Fe$_{x}$O$_3$ with compositions 0
$\leq x \leq$ 1.0. The bulk dc resistivity shows a temperature variation
consistent with the variable range hopping mechanism at low temperature and
Arrhenius mechanism... | 0810.3502v1 |
2008-11-05 | Superconductivity at 56 K in Samarium-doped SrFeAsF | We synthesized the samples Sr$_{1-x}$Sm$_x$FFeAs with ZrCuSiAs-type
structure. These samples were characterized by resistivity and susceptibility.
It is found that substitution of rare earth metal for alkaline earth metal in
this system suppresses the anomaly in resistivity and induces
superconductivity. Superconductiv... | 0811.0761v3 |
2008-12-31 | Cosmic-ray driven dynamo in galactic disks | We present new developments on the Cosmic--Ray driven, galactic dynamo,
modeled by means of direct, resistive CR--MHD simulations, performed with ZEUS
and PIERNIK codes. The dynamo action, leading to the amplification of
large--scale galactic magnetic fields on galactic rotation timescales, appears
as a result of galac... | 0901.0111v1 |
2009-01-13 | Spin-Orbit Scattering and Quantum Metallicity in Ultra-Thin Be Films | We compare and contrast the low temperature magnetotransport properties of
ultra-thin, insulating, Be films with and without spin-orbit scattering (SOS).
Beryllium films have very little intrinsic SOS, but by "dusting" them with
sub-monolayer coverages of Au, one can introduce a well controlled SOS rate.
Pure Be films ... | 0901.1873v1 |
2009-02-12 | Two-Fluid Magnetohydrodynamic Simulations of Relativistic Magnetic Reconnection | We investigate the large scale evolution of a relativistic magnetic
reconnection in an electron-positron pair plasma by a relativistic two-fluid
magnetohydrodynamic (MHD) code. We introduce an inter-species friction force as
an effective resistivity to dissipate magnetic fields. We demonstrate that
magnetic reconnectio... | 0902.2074v2 |
2009-03-03 | Insulating Phases Induced by Crossing of Partially Filled Landau Levels in a Si Quantum Well | We study magnetotransport in a high mobility Si two-dimensional electron
system by in situ tilting of the sample relative to the magnetic field. A
pronounced dip in the longitudinal resistivity is observed during the Landau
level crossing process for noninteger filling factors. Together with a Hall
resistivity change w... | 0903.0486v2 |
2009-03-22 | The Turbulent Magnetic Prandtl Number of MHD Turbulence in Disks | The magnetic Prandtl number Pr_M is the ratio of viscosity to resistivity. In
astrophysical disks the diffusion of angular momentum (viscosity) and magnetic
fields (resistivity) are controlled by turbulence. Phenomenological models of
the evolution of large scale poloidal magnetic fields in disks suggest that the
turbu... | 0903.3757v1 |
2009-04-08 | Gate-controlled non-volatile graphene-ferroelectric memory | In this letter, we demonstrate a non-volatile memory device in a graphene FET
structure using ferroelectric gating. The binary information, i.e. "1" and "0",
is represented by the high and low resistance states of the graphene working
channels and is switched by controlling the polarization of the ferroelectric
thin fi... | 0904.1326v2 |
2009-04-13 | Breakdown of the N=0 Quantum Hall State in graphene: two insulating regimes | We studied the unusual Quantum Hall Effect (QHE) near the charge neutrality
point (CNP) in high-mobility graphene sample for magnetic fields up to 18 T. We
observe breakdown of the delocalized QHE transport and strong increase in
resistivities $\rho_{xx},|\rho_{xy}|$ with decreasing Landau level filling for
$\nu < 2$, ... | 0904.1996v3 |
2009-08-03 | The role of thermal conduction in magnetized viscous-resistive ADAFs | Observations of the hot gas, which is surrounding Sgr A* and a few other
nearby galactic nuclei, imply that mean free paths of electron and proton are
comparable to gas capture radius. So, hot accretion flows likely proceed under
week collision conditions. As a result thermal conduction by ions has a
considerable contr... | 0908.0325v1 |
2009-08-23 | Direct Measurement of Thermal Fluctuation of High-Q Pendulum | We achieved for the first time a direct measurement of the thermal
fluctuation of a pendulum in an off-resonant region using a laser
interferometric gravitational wave detector. These measurements have been well
identified for over one decade by an agreement with a theoretical prediction,
which was derived by a fluctua... | 0908.3227v1 |
2009-08-25 | Superconductivity in a single C60 transistor | Single molecule transistors (SMTs) are currently attracting enormous
attention as possible quantum information processing devices. An intrinsic
limitation to the prospects of these however is associated to the presence of a
small number of quantized conductance channels, each channel having a high
access resistance of ... | 0908.3638v1 |
2009-08-26 | Observation of quantum-Hall effect in gated epitaxial graphene grown on SiC (0001) | Epitaxial graphene films were formed on the Si-face of semi-insulating 4H-SiC
substrates by a high temperature sublimation process. A high-k gate stack on
epitaxial graphene is realized by inserting a fully oxidized nanometer thin
aluminum film as a seeding layer followed by an atomic-layer deposition
process. The elec... | 0908.3822v3 |
2009-12-03 | C-axis critical current of a PrFeAsO0.7 single crystal | The c-axis transport properties of a high-pressure synthesized PrFeAsO0.7
single crystal are studied using s-shaped junctions. Resistivity anisotropy of
about 120 detected at 50 K shows the presence of strong anisotropy in the
electronic states. The obtained critical current density for the c-axis of
2.9*10^5 A/cm^2 is... | 0912.0598v1 |
2010-01-12 | Resistive Magnetic Field Generation at Cosmic Dawn | Relativistic charged particles (CR for cosmic-rays) produced by Supernova
explosion of the first generation of massive stars that are responsible for the
re-ionization of the universe escape into the intergalactic medium, carrying an
electric current. Charge imbalance and induction give rise to a return current,
$\vec ... | 1001.2011v2 |
2010-01-19 | Theory of Normal State Pseudogap Behavior in FeSe(1-x)$Te(x) | The normal state of the recently discovered Iron Selenide (FeSe)-based
superconductors shows a range of inexplicable features. Along with bad-metallic
resistivity, characteristic pseudogap features and proximity to insulating
states, reminiscent of the underdoped high-Tc cuprates, mark these systems as
strongly correla... | 1001.3273v1 |
2010-02-08 | Indirect Magnetic-Field-Tuned Superconductor-Insulator Transitions and Weak Localization of Bosons of Quasi-Two Dimensional Metal Films | Magnetic field and electrostatically tuned superconductor-insulator (SI)
transitions of ultrathin metal films with levels of disorder that place them
near the disorder-tuned SI transition appear to be direct, continuous quantum
phase transitions. When films with lower levels of disorder are subjected to a
perpendicular... | 1002.1720v1 |
2010-02-16 | Dynamic Nuclear Polarization and Nuclear Magnetic Resonance in the Simplest Pseudospin Quantum Hall Ferromagnet | We present dynamic nuclear polarization (DNP) in the simplest pseudospin
quantum Hall ferromagnet (QHF) of an InSb two-dimensional electron gas with a
large g factor using tilted magnetic fields. The DNP-induced amplitude change
of a resistance spike of the QHF at large current enables observation of the
resistively de... | 1002.3087v3 |
2010-02-28 | Microwave-induced magnetoresistance of two-dimensional electrons interacting with acoustic phonons | The influence of electron-phonon interaction on magnetotransport in
two-dimensional electron systems under microwave irradiation is studied
theoretically. Apart from the phonon-induced resistance oscillations which
exist in the absence of microwaves, the magnetoresistance of irradiated samples
contains oscillating cont... | 1003.0178v1 |
2010-03-19 | Evidence for Anisotropic Vortex Dynamics and Pauli Limitation in the Upper Critical Field of FeSe1-xTex | We have determined HC2(T) for FeSe1-xTex (x=0.52) single crystals using
resistivity measurements at high static and pulsed magnetic field, as well as
specific heat measurements up to 9T. We find that the significant anisotropy of
the initial slope of HC2(T) determined from resistivity measurements, is not
present when ... | 1003.3812v1 |
2010-03-29 | Three Dimensional Superconductivity in FeSe with Tczero Up to 10.9 K Induced by Internal Strain | Polycrystalline sample FeSe was synthesized by a self-flux solution method
which shows a zero resistance temperature up to 10.9 K and a Tconset (90%
\rhon, \rhon: normal state resistivity) up to 13.3 K. The decrease of
superconducting transition temperature by heat treatment indicates that
internal crystallographic str... | 1003.5415v1 |
2010-06-01 | Synthesis, structural and physical properties of $δ'$-FeSe$_{1-x}$ | We report on synthesis, structural characterization, resistivity, magnetic
and thermal expansion measurements on the as yet unexplored $\delta'$-phase of
FeSe$_{1-x}$, here synthesized under ambient- (AP) and high-pressure (HP)
conditions. We show that in contrast to $\beta$-FeSe$_{1-x}$, monophasic
superconducting $\d... | 1006.0073v2 |
2010-07-23 | Phonon-induced resistance oscillations of two-dimensional electron systems drifting with supersonic velocities | We present a theory of the phonon-assisted nonlinear dc transport of 2D
electrons in high Landau levels. The nonlinear dissipative resistivity displays
quantum magneto-oscillations governed by two parameters which are proportional
to the Hall drift velocity $v_H$ of electrons in electric field and the speed
of sound $s... | 1007.4211v1 |
2010-07-26 | Quantum phase transition of dynamical resistance in a mesoscopic capacitor | We study theoretically dynamic response of a mesoscopic capacitor, which
consists of a quantum dot connected to an electron reservoir via a point
contact and capacitively coupled to a gate voltage. A quantum Hall edge state
with a filling factor nu is realized in a strong magnetic field applied
perpendicular to the two... | 1007.4404v1 |
2010-08-12 | Single crystal growth and superconducting properties of LiFeAs | We report the successful growth of high quality single crystals of LiFeAs
with lateral sizes up to 5 x 5 mm2 by the Sn-flux method. Electrical
resistivity studies reveal that the superconducting onset temperature is 18.2 K
with a transition width less than 1.1 K and the ratio of room temperature to
residual resistivity... | 1008.2050v1 |
2010-09-07 | Mesoscopic transport in ultrathin films of La$_{0.67}$Ca$_{0.33}$MnO$_3$ | We investigate the electrical transport in mesoscopic structures of
La$_{0.67}$Ca$_{0.33}$MnO$_3$ in the regime of the metal-insulator transition
by fabricating microbridges from strained and unstrained thin films. We measure
current-voltage characteristics as function of temperature and in high magnetic
fields and wit... | 1009.1386v1 |
2010-09-28 | Influence of disorder on conductance in bilayer graphene under perpendicular electric field | Electron transport in bilayer graphene placed under a perpendicular electric
field is revealed experimentally. Steep increase of the resistance is observed
under high electric field; however, the resistance does not diverge even at low
temperatures. The observed temperature dependence of the conductance consists
of two... | 1009.5467v1 |
2010-11-18 | Vortex density waves and negative absolute resistance in patterned superconductors | We study theoretically dynamical phases of vortices in superconducting films
with arrays of obstacles. By performing a series of molecular dynamics
simulations and analytical calculations, we demonstrate the existence of a
phase of soliton-like vortex-density waves appearing in a wide range of
parameters. These waves a... | 1011.4172v2 |
2010-12-03 | Magnetic and electrical properties and carrier doping effects on the Fe-based host compound Sr4Sc2Fe2As2O6 | Additional charge carriers were introduced to the iron oxyarsenide
Sr4Sc2Fe2As2O6 under a high-pressure condition, followed by measurements of
electrical resistivity, Hall coefficient, and magnetic susceptibility. The host
compound Sr4Sc2Fe2As2O6 shows metallic conductivity down to ~200 K and turns to
show a semiconduc... | 1012.0616v1 |
2010-12-06 | An analytical model of fractional overshooting | We predict resistance anomalies to be observed at high mobility two
dimensional electron systems (2DESs) in the fractional quantized Hall regime,
where the narrow (L <10 ?m) Hall bar is defined by top gates. An analytic
calculation scheme is used to describe the formation of integral and fractional
incompressible strip... | 1012.1294v1 |
2010-12-31 | Beam test of signal cross-talk and transmission for LMPRC | A new prototype of large area Multi-gap Resistive Plate Chamber (MRPC) with
long readout strips was built. This Long-strip Multi-gap Resistive Plate
Chamber (LMRPC) is double stacked and has ten 250 $\mu$m-thick gas gaps.
Signals are read out from two ends of strip with an active area of 50
cm$\times$2.5 cm in each. Th... | 1101.0224v1 |
2011-02-10 | Stimulated emission and absorption of photons in magnetic point contacts: toward metal-based spin-lasers | Point contacts between high anisotropy ferromagnetic SmCo5 and normal metal
Cu are used to achieve a strong spin-population inversion in the contact core.
Subjected to microwave irradiation in resonance with the Zeeman splitting in
Cu, the inverted spin-population relaxes through stimulated spin-flip photon
emission, d... | 1102.2167v1 |
2011-02-14 | Edge effect on resistance scaling rules in graphene nanostructures | We report an experimental investigation of the edge effect on the
room-temperature transport in graphene nanoribbon and graphene sheet (both
single-layer and bilayer). By measuring the resistance scaling behaviors at
both low and high carrier densities, we show that the transport of single-layer
nanoribbons lies in a s... | 1102.2681v1 |
2011-02-20 | In situ TEM investigation of oxygen migration as a key mechanism for resistive switching in Pr0.7Ca0.3MnO3 | Low temperature growth Pr0.7Ca0.3MnO3 (PCMO) thin film showed high
performance in electric field induced resistance switching (RS). To understand
the micro-mechanism of RS in Metal/PCMO/Metal devices, structure evolution of
PCMO under external electric field monitored inside transmission electron
microscope (TEM) were ... | 1102.4044v3 |
2011-05-19 | Enhancement of the Superconducting Transition Temperature with Hydrostatic Pressure in Ca_{3}Ir_{4}Sn_{13} Single Crystals | We report high pressure magnetic susceptibility and electrical resistivity
measurements on Ca_{3}Ir_{4}Sn_{13} single crystals up to 60 kbar. These
measurements allow us to follow the evolution of the superconducting critical
temperature T_c, the resistivity anomaly temperature T*, the superconducting
coherence length ... | 1105.3941v1 |
2011-05-24 | Low Bias Negative Differential Resistance in Graphene Nanoribbon Superlattices | We theoretically investigate negative differential resistance (NDR) for
ballistic transport in semiconducting armchair graphene nanoribbon (aGNR)
superlattices (5 to 20 barriers) at low bias voltages V_SD < 500 mV. We combine
the graphene Dirac Hamiltonian with the Landauer-B\"uttiker formalism to
calculate the current... | 1105.4850v2 |
2011-10-22 | Pressure Induced Metallization of BaMn2As2 | The temperature and pressure dependent electrical resistivity rho(T,P)
studies have been performed on BaMn2As2 single crystal in the 4.2 to 300 K
range upto of 8.2 GPa to investigate the evolution of its ground state
properties. The rho(T) shows a negative co-efficient of resistivity under
pressure upto 3.2 GPa. The oc... | 1110.4969v2 |
2011-10-24 | Two coupled Josephson junctions: dc voltage controlled by biharmonic current | We study transport properties of two Josephson junctions coupled by an
external shunt resistance. One of the junction (say, the first) is driven by an
unbiased ac current consisting of two harmonics. The device can rectify the ac
current yielding a dc voltage across the first junction. For some values of
coupling stren... | 1110.5287v3 |
2011-10-31 | Resistivity saturation in a weakly interacting 2D Fermi liquid at intermediate temperatures | We report a highly unusual temperature dependence in the magnetoresistance of
a weakly interacting high mobility 2D electron gas (2DEG) under a parallel
magnetic field and when the current is perpendicular to the field. While the
linear temperature dependence below 10 K and the exponential temperature
dependence above ... | 1111.0011v2 |
2011-11-14 | Anomalous resistivity and the electron-polaron effect in the two-band Hubbard model with one narrow band | We search for anomalous normal and superconductive behavior in the two-band
Hubbard model with one narrow band. We analyze the influence of
electron-polaron effect and Altshuler-Aronov effect on effective mass
enhancement and scattering times of heavy and light components in the clean
case. We find anomalous behavior o... | 1111.3135v1 |
2011-12-07 | Low carrier concentration crystals of the topological insulator Bi$_2$Te$_2$Se | We report the characterization of Bi$_2$Te$_2$Se crystals obtained by the
modified Bridgman and Bridgman-Stockbarger crystal growth techniques. X-ray
diffraction study confirms an ordered Se-Te distribution in the inner and outer
chalcogen layers, respectively, with a small amount of mixing. The crystals
displaying hig... | 1112.1648v1 |
2011-12-22 | Field induced quantum-Hall ferromagnetism in suspended bilayer graphene | We have measured the magneto-resistance of freely suspended high-mobility
bilayer graphene. For magnetic fields $B>1$ T we observe the opening of a field
induced gap at the charge neutrality point characterized by a diverging
resistance. For higher fields the eight-fold degenerated lowest Landau level
lifts completely.... | 1112.5368v2 |
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