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Structural Modulation in LaO0.9F0.1BiSe2 Single Crystals Revealed by
Scanning Tunneling Microscopy/Spectroscopy: We present scanning tunneling microscopy and spectroscopy measurements on a
cleaved surface of the LaO0.9F0.1BiSe2 single crystals. Tunneling spectra show
a finite local density of states at EF, which is c... | cond-mat_supr-con |
Charge creation and nucleation of longitudinal plasma wave in coupled
Josephson junctions: We study the phase dynamics in coupled Josephson junctions describing by
system of nonlinear differential equations. Results of detailed numerical
simulations of charge creation in the superconducting layers and the
longitudina... | cond-mat_supr-con |
Zero-crossing Shapiro steps in focused-ion-beam-tailored high-$T_c$
superconducting microstructures: Microwave response of S-shaped Bi$_2$Sr$_2$CaCu2O$_{8+x}$ (Bi-2212)
micron-scale samples, in which the supercurrent was forced to flow
perpendicular to the crystal layers, was investigated. A treatment with a
focused ... | cond-mat_supr-con |
The circulation radius and critical current density in type-II
superconductors: A method is proposed for estimating the length scale of currents circulating
in superconductors. The estimated circulation radius is used to determine the
critical current density on the basis of magnetic measurements. The obtained
formul... | cond-mat_supr-con |
Giant shot noise from Majorana zero modes in topological trijunctions: The clear-cut experimental identification of Majorana bound states in
transport measurements still poses experimental challenges. We here show that
the zero-energy Majorana state formed at a junction of three topological
superconductor wires is dire... | cond-mat_supr-con |
Cooper pairs localization in tree-like networks of superconducting
islands: We study inhomogeneous Cooper pairs distribution and localization effects in
tree-like networks of superconducting islands coupled via Josephson weak links.
Using a generalized Feynman's approach, reminiscent of the Bose-Hubbard model,
we dem... | cond-mat_supr-con |
Pinning properties of FeSeTe thin film through multifrequency
measurements of the surface impedance: We present high frequency measurements of the vortex dynamics of a
FeSe$_x$Te$_{1-x}$ ($x=0.5$) thin film grown on a CaF$_2$ substrate and with a
critical temperature $T_c\simeq18\;$K, performed by means of a dual fre... | cond-mat_supr-con |
Nonequilibrium transport via spin-induced sub-gap states in
superconductor/quantum dot/normal metal cotunnel junctions: We study low-temperature transport through a Coulomb blockaded quantum dot
(QD) contacted by a normal (N), and a superconducting (S) electrode. Within an
effective cotunneling model the conduction e... | cond-mat_supr-con |
Some Global Properties of the Attractive Hubbard Model in the
Superconducting Phase: T-Matrix Approximation in 2D: We have applied the Fast Fourier transform (FFT), which allows to compute
efficiently convolution sums, to solve the set of self-consistent T-matrix
equations to get the Green function of the two dimensi... | cond-mat_supr-con |
Unusual Relationship between Magnetism and Superconductivity in
FeTe$_{0.5}$Se$_{0.5}$: We use neutron scattering, to study magnetic excitations in crystals near the
ideal superconducting composition of FeTe$_{0.5}$Se$_{0.5}$. Two types of
excitations are found, a resonance at (0.5, 0.5, 0) and incommensurate
fluctua... | cond-mat_supr-con |
Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry: We show using a combination of powder X-ray and neutron diffraction, first
principles calculations, temperature- and field-dependent magnetization, heat
capacity and resistivity data that the superconducting behavior of
`Sr$_4$V$_2$O$_6$Fe$_2$As$_2$' i... | cond-mat_supr-con |
Small Fermi energy, zero point fluctuations and nonadiabaticity in
MgB$_2$: Small Fermi energy effects are induced in MgB$_2$ by the low hole doping in
the $\sigma$ bands which are characterized by a Fermi energy $E_{\rm F}^\sigma
\sim 0.5$ eV. We show that, due to the particularly strong deformation
potential relati... | cond-mat_supr-con |
Superconductivity in WO2.6F0.4 synthesized by reaction of WO3 with
Teflon: WO3-xFx (x < 0.45) perovskite-like oxyfluorides were prepared by a chemically
reducing fluorination route using the polymer polytetrafluoroethylene (Teflon).
The symmetry of the crystal structures of WO3-xFx changes from monoclinic to
tetragon... | cond-mat_supr-con |
Observation of pseudogap-like feature above Tc in LiFeAs and
(Ba0.6K0.4)Fe2As2 by ultrafast optical measurement: We utilize ultrafast optical measurement to study the quasiparticle
relaxation in stoichiometric LiFeAs and nearly optimally doped (BaK)Fe2As2
crystals. According to our temperature-dependent studies of Li... | cond-mat_supr-con |
Ring Oscillators for Clocking Reversible Superconducting Circuits and
Fabrication Process Benchmarking: Existing concepts of reversible superconducting circuits as well as
demonstrated adiabatic circuits require three-phase bias/clock signals
generated by room temperature sources. A while ago, we suggested that a
mul... | cond-mat_supr-con |
Topological superconductivity on the surface of Fe-based superconductors: As one of the simplest systems for realizing Majorana fermions, topological
superconductor plays an important role in both condensed matter physics and
quantum computations. Based on \emph{ab~initio} calculations and the analysis
of an effective ... | cond-mat_supr-con |
Mechanism of Cooper-pairing in layered high temperature superconductors: In this study, the pairing mechanism for layered HTS materials based on
attraction between electrons from adjacent layers is proposed. Initially, each
layer has expanded Fermi sphere owing to ridged geometry. When the two layers
are close enough f... | cond-mat_supr-con |
Scenario of Superconducting Transition for quasi-2D HTS: We discuss the scenario of superconducing transition for quasi two dimension
HTS with spin fluctuation pairing mechanism. At mean field temperature of 2D
superconducting transition the interaction of fluctuation spin waves with holes
in copper-oxigen planes leads... | cond-mat_supr-con |
Connection between the semiconductor--superconductor transition and the
spin-polarized superconducting phase in the honeycomb lattice: The band structure of noninteracting fermions in the honeycomb lattice
exhibits the Dirac cones at the corners of the Brillouin zone. As a
consequence, fermions in this lattice manife... | cond-mat_supr-con |
Stability conditions for a large anharmonic bipolaron: A large polaron is a quasiparticle that consists of a nearly free electron
interacting with the phonons of a material, whose lattice parameters are much
smaller than the polaron scale. The electron-phonon interaction also leads to
an attractive interaction between ... | cond-mat_supr-con |
Universal suppression of superfluid weight by disorder independent of
quantum geometry and band dispersion: Motivated by the experimental progress in controlling the properties of the
energy bands in superconductors, significant theoretical efforts have been
devoted to study the effect of the quantum geometry and the... | cond-mat_supr-con |
Tunneling conductance in Superconductor/Ferromagnet junctions: a self
consistent approach: We evaluate the tunneling conductance of clean Ferromomagnet/Superconductor
junctions via a fully self-consistent numerical solution of the microscopic
Bogoliubov-DeGennes equations. We present results for a relevant range of
v... | cond-mat_supr-con |
Bias current dependence of superconducting transition temperature in
superconducting spin valve nanowires: Competition between superconducting and ferromagnetic ordering at interfaces
between ferromagnets (F) and superconductors (S) gives rise to several
proximity effects such as odd-triplet superconductivity and spi... | cond-mat_supr-con |
Doping evolution of itinerant magnetic excitations in Fe-based
oxypnictides: Employing the four-band tight-binding model we study theoretically the doping
dependence of the spin response in the normal state of novel Fe-based pnictide
superconductors. We show that the commensurate spin density wave (SDW)
transition th... | cond-mat_supr-con |
Superconductivity with hard-core repulsion: BCS-Bose crossover and
s-/d-wave competition: We consider fermions on a 2D lattice interacting repulsively on the same site
and attractively on the nearest neighbor sites. The model is relevant, for
instance, to study the competition between antiferromagnetism and
supercond... | cond-mat_supr-con |
Large gap, a pseudogap and proximity effect in the Bi2Te3/Fe1+yTe
interfacial superconductor: We report directional point-contact spectroscopy data on the novel
Bi2Te3/Fe1+yTe interfacial superconductor for a Bi2Te3 thickness of 9 quintuple
layers, bonded by van der Waals epitaxy to a Fe1+yTe film at an atomically
sh... | cond-mat_supr-con |
Anisotropy of the upper critical field in MgB2: the two-gap
Ginzburg-Landau theory: The upper critical field in MgB2 is investigated in the framework of the
two-gap Ginzburg-Landau theory. A variational solution of linearized
Ginzburg-Landau equations agrees well with the Landau level expansion and
demonstrates that ... | cond-mat_supr-con |
Anisotropic angle-dependent Andreev reflection at the
ferromagnet/superconductor junction on the surface of topological insulators: We theoretically demonstrate that a ferromagnetic/superconductor junction on
the surface of three-dimensional topological insulators (3D TIs) has an
anisotropic angle-dependent Andreev r... | cond-mat_supr-con |
Symmetry protected line nodes in non-symmorphic magnetic space groups:
Applications to UCoGe and UPd$_2$Al$_3$: We present the group-thoretical classification of gap functions in
superconductors coexisting with some magnetic order in non-symmorphic magnetic
space groups. Based on the weak-coupling BCS theory, we show... | cond-mat_supr-con |
Emergence of an incipient ordering mode in FeSe: The structurally simplest Fe-based superconductor FeSe with a critical
temperature $T_{c}\approx$ 8.5 K displays a breaking of the four-fold
rotational symmetry at a temperature $T_{s}\approx 87$ K. We investigated the
electronic properties of FeSe using scanning tunneli... | cond-mat_supr-con |
Engineering Quantum Interference: A model for describing interference and diffraction of wave functions of
one-dimensional Josephson array interferometers is presented. The derived
expression for critical current modulations accounts for an arbitrary number of
square junctions, variable distance between these, and vari... | cond-mat_supr-con |
Phase transitions in a three dimensional $U(1) \times U(1)$ lattice
London superconductor: We consider a three-dimensional lattice $U(1) \times U(1)$ superconductor in
the London limit, with two individually conserved condensates. The problem,
generically, has two types of intercomponent interactions of different
cha... | cond-mat_supr-con |
Quantum Coherence of Electrons Field-Emitted from a Superconductor:
Correlations and Entanglement: The correlations of the electrons field-emitted from a superconductor are
fully analyzed, both in space and time. It is proposed that a coincidence
experiment would reveal a positive correlation between the electrons em... | cond-mat_supr-con |
Using Josephson junctions to determine the pairing state of
superconductors without crystal inversion symmetry: Theoretical studies of a planar tunnel junction between two superconductors
with antisymmetric spin-orbit coupling are presented. The half-space Green's
function for such a superconductor is determined. Thi... | cond-mat_supr-con |
Interplay between spin density wave and superconductivity in '122' iron
pnictides: 57Fe Mössbauer study: Iron-based superconductors Ba0.7Rb0.3Fe2As2 and CaFe1.92Co0.08As2 of the
'122' family have been investigated by means of the 14.41-keV Moessbauer
transition in 57Fe versus temperature ranging from the room tempera... | cond-mat_supr-con |
Itinerant approach to magnetic neutron scattering of FeSe: effect of
orbital selectivity: Recent STM experiments and theoretical considerations have highlighted the
role of interaction-driven orbital selectivity in FeSe, and its role in
generating the extremely anisotropic superconducting gap structure in this
materi... | cond-mat_supr-con |
The Nernst effect in high-$T_c$ superconductors: The observation of a large Nernst signal $e_N$ in an extended region above
the critical temperature $T_c$ in hole-doped cuprates provides evidence that
vortex excitations survive above $T_c$. The results support the scenario that
superfluidity vanishes because long-range... | cond-mat_supr-con |
Absence of structural transition in TM0.5IrTe2 (TM=Mn, Fe, Co, Ni): TM-doped IrTe2(TM=Mn, Fe, Co, Ni) compounds were synthesized by solid state
reaction. Single crystal x-ray diffraction experiments indicate that part of
the doped TM ions (TM=Fe, Co, and Ni) substitute for Ir, and the rest
intercalate into the octahedr... | cond-mat_supr-con |
Magnetic properties of undoped and 15%F doped SmFeAsO compounds: In this paper the magnetic behaviour of SmFeAsO and SmFeAs(O0.85F0.15)
samples is presented and discussed. Molar susceptibility of SmFeAsO exhibits a
local peak at T around 140K due to the establishment of a long range
antiferromagnetic ordering of the Fe... | cond-mat_supr-con |
Bulk properties and electronic structure of PuFeAsO: Here we present bulk property measurements and electronic structure
calculations for PuFeAsO, an actinide analogue of the iron-based rare-earth
superconductors RFeAsO. Magnetic susceptibility and heat capacity data suggest
the occurrence of an antiferromagnetic trans... | cond-mat_supr-con |
Pseudogap from ARPES experiment: three gaps in cuprates and topological
superconductivity: A term first coined by Mott back in 1968 a `pseudogap' is the depletion of
the electronic density of states at the Fermi level, and pseudogaps have been
observed in many systems. However, since the discovery of the high tempera... | cond-mat_supr-con |
Superconductivity driven by the screening of long-distance Coulomb
interaction: The pair-fluctuation contribution reduces the electrostatic screening length
in superconductivity as compared to the normal state. When a conductor
possesses a static background charge distribution, superconductivity arises
even in the ab... | cond-mat_supr-con |
Microwave emission from superconducting vortices in Mo/Si superlattices: Most of superconductors in a magnetic field are penetrated by a lattice of
quantized flux vortices. In the presence of a transport current causing the
vortices to cross sample edges, emission of electromagnetic waves is expected
due to the continu... | cond-mat_supr-con |
Combined effects of pressure and Ru substitution on BaFe2As2: The ab-plane resistivity of Ba(Fe1-xRux)2As2 (x = 0.00, 0.09, 0.16, 0.21, and
0.28) was studied under nearly hydrostatic pressures, up to 7.4 GPa, in order
to explore the T-P phase diagram and to compare the combined effects of
iso-electronic Ru substitution... | cond-mat_supr-con |
Visualizing supercurrents in ferromagnetic Josephson junctions with
various arrangements of 0 and πsegments: Josephson junctions with ferromagnetic barrier can have positive or negative
critical current depending on the thickness $d_F$ of the ferromagnetic layer.
Accordingly, the Josephson phase in the ground state i... | cond-mat_supr-con |
Multiple Andreev Reflections in Weak Links of Superfluid 3He-B: We calculate the current-pressure characteristics of a ballistic pinhole
aperture between two volumes of B-phase superfluid 3He. The most important
mechanism contributing to dissipative currents in weak links of this type is
the process of multiple Andreev... | cond-mat_supr-con |
Magnetic properties of magnetically textured Bi-2212 ceramics: This paper aims at reporting magnetic properties of bulk polycrystalline
Bi2Sr2Ca0.8Dy0.2Cu2O8-y samples textured under a magnetic field. The
microstructure of these materials is highly anisotropic and exhibits particular
features needed to be taken into ac... | cond-mat_supr-con |
Tunable artificial vortex ice in nanostructured superconductors with
frustrated kagome lattice of paired antidots: Theoretical proposals for spin ice analogs based on nanostructured
superconductors have suggested larger flexibility for probing the effects of
fluctuations and disorder than in the magnetic systems. In ... | cond-mat_supr-con |
Evidence for interfacial superconductivity in a bi-collinear
antiferromagnetically ordered FeTe monolayer on a topological insulator: The discovery of high-temperature superconductivity in Fe-based compounds
[1,2] has triggered numerous investigations on the interplay between
superconductivity and magnetism [3] and, ... | cond-mat_supr-con |
Vortex Dipole in a Trapped Atomic Bose-Einstein Condensate: We calculate the angular momentum and energy of a vortex dipole in a trapped
atomic Bose-Einstein condensate. Fully analytic expressions are obtained. We
apply the results to understand a novel phenomenon in the MIT group experiment,
an excellent agreement is ... | cond-mat_supr-con |
Tuning orbital-selective correlation effects in superconducting
Rb$_{0.75}$Fe$_{1.6}$Se$_{2-z}$S$_z$: We report on terahertz time-domain spectroscopy on superconducting and
metallic iron chalcogenides Rb$_{0.75}$Fe$_{1.6}$Se$_{2-z}$S$_z$. The
superconducting transition is reduced from $T_c=$ 32 K ($z=0$) to 22 K
($z=... | cond-mat_supr-con |
Unexpected impact of magnetic disorder on multiband superconductivity: We analyze how the magnetic disorder affects the properties of the two-band
$s_\pm$ and $s_{++}$ models, which are subject of hot discussions regarding
iron-based superconductors and other multiband systems like MgB$_2$. We show
that there are sever... | cond-mat_supr-con |
Electrodynamic response of MgB2 sintered pellets and thin films: We present a study of the electrodynamic response of MgB2 pellets and thin
film samples exhibiting critical temperatures ranging between 26 and 38 K. We
have performed accurate measurements of the surface impedance ZS =RS+iXS as a
function of the temperat... | cond-mat_supr-con |
On the extraction of paramagnon excitations from resonant inelastic
X-ray scattering experiments: Resonant X-ray scattering experiments on high-temperature superconductors and
related cuprates have revealed the presence of intense paramagnon scattering at
high excitation energies, of the order of several hundred meV.... | cond-mat_supr-con |
On the interpretation of the equilibrium magnetization in the mixed
state of high-Tc superconductors: We apply a recently developed scaling procedure to the analysis of
equilibrium magnetization M(H) data that were obtained for T-2212 and
Bi-2212single crystals and were reported in the literature. The temperature
dep... | cond-mat_supr-con |
Vortex dynamic, pinning and irreversibility field investigation in
EuRbFe4As4 superconductor: We performed systematic AC susceptibility and magnetic moment measurements to
investigate the vortex dynamics and pinning in the $EuRbFe_4As_4$ single
crystal as a function of temperature, frequency, and DC magnetic field. T... | cond-mat_supr-con |
Imaging the Meissner effect and flux trapping in a hydride
superconductor at megabar pressures using a nanoscale quantum sensor: By directly altering microscopic interactions, pressure provides a powerful
tuning knob for the exploration of condensed phases and geophysical phenomena.
The megabar regime represents an e... | cond-mat_supr-con |
Appearance of fluctuating stripes at the onset of the pseudogap in the
high-Tc Superconductor Bi2Sr2CaCu2O8+x: Doped Mott insulators have been shown to have a strong propensity to form
patterns of holes and spins often referred to as stripes. In copper-oxides,
doping also gives rise to the pseudogap state, which tran... | cond-mat_supr-con |
Doping-Dependent and Orbital-Dependent Band Renormalization in
Ba(Fe_1-xCo_x)_2As_2 Superconductors: Angle resolved photoemission spectroscopy of Ba(Fe1-xCox)2As2 (x = 0.06,
0.14, and 0.24) shows that the width of the Fe 3d yz/zx hole band depends on
the doping level. In contrast, the Fe 3d x^2-y^2 and 3z^2-r^2 bands... | cond-mat_supr-con |
Groove-rolling as an alternative process to fabricate Bi-2212 wires for
practical applications: Bi2Sr2CaCu2O8+x (Bi-2212) superconducting long-length wires are mainly
limited in obtaining high critical currents densities (JC) by the internal gas
pressure generated during the heat treatment, which expands the wire dia... | cond-mat_supr-con |
Determining the absolute value of magnetic penetration depth in
small-sized superconducting films: In the previous four decades, a two-coil mutual inductance (MI) technique has
been widely employed in characterizing magnetic penetration depth, $\lambda$,
of superconducting films. However, the conventional methods use... | cond-mat_supr-con |
Type-II Ising superconductivity in two-dimensional materials with strong
spin-orbit coupling: Recent discovery of Ising superconductivity protected against in-plane
magnetic field by spin-orbit coupling (SOC) has stimulated intensive research
interests. The effect, however, was only expected to appear in two-dimensio... | cond-mat_supr-con |
Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by
scanning tunneling microscopy: Single-layer FeSe film on SrTiO3(001) was recently found to be the champion
of interfacial superconducting systems, with a much enhanced superconductivity
than the bulk iron-based superconductors. Its superconductin... | cond-mat_supr-con |
Surface Specific Heat of $^{3}$He and Andreev Bound States: High resolution measurements of the specific heat of liquid $^{3}$He in the
presence of a silver surface have been performed at temperatures near the
superfluid transition in the pressure range of 1 to 29 bar. The surface
contribution to the heat capacity is i... | cond-mat_supr-con |
Universal scaling in BCS superconductivity in two dimensions in non-s
waves: The solutions of a renormalized BCS model are studied in two space dimensions
in $s$, $p$ and $d$ waves for finite-range separable potentials. The gap
parameter, the critical temperature $T_c$, the coherence length $\xi$ and the
jump in spec... | cond-mat_supr-con |
Temperature dependence of clusters with attracting vortices in
superconducting Niobium studied by neutron scattering: We have investigated the intermediate mixed state of a superconducting
niobium sample by Very Small Angle Neutron Scattering.We show that this state
is stabilized through a sequence where a regular vo... | cond-mat_supr-con |
Superfluid density of Ba(Fe$_{1-x}M_x$)$_2$As$_2$ from optical
experiments: The temperature dependence of the $ab$-plane optical reflectivity of
Ba(Fe$_{0.92}$Co$_{0.08})_2$As$_{2}$ and Ba(Fe$_{0.95}$Ni$_{0.05})_2$As$_{2}$
single crystals is measured in a wide spectral range. Upon entering the
superconducting regime,... | cond-mat_supr-con |
Enhanced superconductivity and superconductor to insulator transition in
nano-crystalline molybdenum thin films: Disorder driven superconductor to insulator transition via intermediate
metallic regime is reported in nano-crystalline thin films of molybdenum. The
nano-structured thin films have been deposited at room ... | cond-mat_supr-con |
Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC
Crossover Regime: We theoretically investigate the ground state of trapped neutral fermions
with population imbalance in the BCS-BEC crossover regime. On the basis of the
single-channel Hamiltonian, we perform full numerical calculations of the
Bogoliu... | cond-mat_supr-con |
Turning insulators into superconductors: The recent observation by Batlogg and colleagues of superconductivity in an
organic field-effect transistor is reviewed. | cond-mat_supr-con |
Momentum-Resolved Electronic Relaxation Dynamics in D-wave
Superconductors: Motivated by recent development in time-resolved angle-resolved photoemission
spectroscopy (trARPES) for d-wave superconductors, we analyze the
non-equilibrium relaxation dynamics of the laser pulse excited sample within
the scenario of two-t... | cond-mat_supr-con |
Increasing d-wave superconductivity by on site repulsion: We study by Variational Monte Carlo an extended Hubbard model away from half
filled band density which contains two competing nearest-neighbor interactions:
a superexchange $J$ favoring d-wave superconductivity and a repulsion $V$
opposing against it. We find th... | cond-mat_supr-con |
Metal-to-Insulator Crossover in YBa_{2}Cu_{3}O_{y} Probed by
Low-Temperature Quasiparticle Heat Transport: It was recently demonstrated that in La_{2-x}Sr_{x}CuO_{4} the magnetic-field
(H) dependence of the low-temperature thermal conductivity \kappa up to 16 T
reflects whether the normal state is a metal or an insul... | cond-mat_supr-con |
Impurity states in multiband s-wave superconductors: analysis of iron
pnictides: We examine the effect of a single, non-magnetic impurity in a multiband,
extended s-wave superconductor allowing for anisotropy of the gaps on the Fermi
surfaces. We derive analytic expressions for the Green's functions in the
continuum ... | cond-mat_supr-con |
Electronic Structure, Localization and Spin-State Transition in
Cu-substituted FeSe: Fe$_{1-x}$Cu$_x$Se: We report density functional studies of the Fe$_{1-x}$Cu$_x$Se alloy done
using supercell and coherent potential approximation methods. Magnetic behavior
was investigated using the disordered local moment approach... | cond-mat_supr-con |
Implementation of Grover search algorithm with Josephson charge qubits: A scheme of implementing the Grover search algorithm based on Josephson
charge qubits has been proposed, which would be a key step to scale more
complex quantum algorithms and very important for constructing a real quantum
computer via Josephson ch... | cond-mat_supr-con |
Implications evinced by the phase diagram, anisotropy, magnetic
penetration depths, isotope effects and conductivities of cuprate
superconductors: Anisotropy, thermal and quantum fluctuations and their dependence on dopant
concentration appear to be present in all cuprate superconductors, interwoven
with the micros... | cond-mat_supr-con |
Distinct Pairing Symmetries in $Nd_{1.85}Ce_{0.15}CuO_{4-y}$ and
$La_{1.89}Sr_{0.11}CuO_{4}$ Single Crystals: Evidence from Comparative
Tunnelling Measurements: We used point-contact tunnelling spectroscopy to study the superconducting
pairing symmetry of electron-doped $Nd_{1.85}Ce_{0.15}CuO_{4-y}$ (NCCO) and
hole... | cond-mat_supr-con |
Possible observation of energy level quantization in an intrinsic
Josephson junction: Energy level quantization (ELQ) is studied to clarify the macroscopic quantum
dynamics of the d-wave Josephson junction (JJ). The influences of the nodal
quasiparticles of d-wave superconductivity on the damping effect are
numerical... | cond-mat_supr-con |
s+is State with Broken Time Reversal Symmetry in Fe-Based
Superconductors: We analyze the evolution of the superconducting gap structure in strongly
hole doped Ba_{1-x}K_xFe_2As_2 between x=1 and x ~ 0.4 (optimal doping). In the
latter case, the pairing state is most likely s+-, with different gap signs on
hole and e... | cond-mat_supr-con |
Supergap and subgap enhanced currents in asymmetric {S_1FS_2} Josephson
junctions: We have theoretically studied the supercurrent profiles in three-dimensional
normal metal and ferromagnetic Josephson configurations, where the magnitude of
the superconducting gaps in the superconducting leads are unequal, i.e.,
$\Del... | cond-mat_supr-con |
Fluctuation, insulation and superconductivity: the pressure-dependent
phase-diagram of Rb$_2$Mo$_6$Se$_6$: The quasi-one-dimensional (q1D) material Rb$_2$Mo$_6$Se$_6$ has been proposed
to display a nontrivial combination of low-dimensional fluctuations and a
dynamical charge density wave (CDW) at ambient pressure. Th... | cond-mat_supr-con |
Physical Properties of Metallic Antiferromagnetic CaCo{1.86}As2 Single
Crystals: We report studies of CaCo{1.86}As2 single crystals. The electronic structure
is probed by angle-resolved photoemission spectroscopy (ARPES) measurements of
CaCo{1.86}As2 and by full-potential linearized augmented-plane-wave
calculations ... | cond-mat_supr-con |
Finite energy spin fluctuation as a pairing glue in systems with
coexisting electron and hole bands: We study, within the fluctuation exchange approximation, the
spin-fluctuation-mediated superconductivity in Hubbard-type models possessing
electron and hole bands, and compare them with a model on a square lattice wit... | cond-mat_supr-con |
High-Density Superconductive Logic Circuits Utilizing 0 and $π$
Josephson Junctions: Superconductor Electronics (SCE) is a fast and power-efficient technology
with great potential for overcoming conventional CMOS electronics' scaling
limits. Nevertheless, the primary challenge confronting SCE today pertains to
its in... | cond-mat_supr-con |
The direct Cu NQR Study of the Stripe Phase in the Lanthanum Cuprates: Using Cu NQR in Eu-doped La_(2-x)Sr_xCuO_4 we find the evidence of the pinned
stripe phase at 1.3K for 0.08<x<0.18. The pinned fraction increases by one
order of magnitude near hole doping x=1/8. The NQR lineshape reveals three
inequivalent Cu posit... | cond-mat_supr-con |
Non-monotonic behaviour of the superconducting order parameter in
Nb/PdNi bilayers observed through point contact spectroscopy: Point contact spectroscopy measurements have been performed on Nb/PdNi
bilayers in which the thickness of the Nb layer, dNb, was kept constant to 40
nm while the thickness of PdNi, dPdNi, wa... | cond-mat_supr-con |
Approaching ideal rectification in superconducting diodes through
multiple Andreev reflections: We analyze the rectification properties of voltage-biased Josephson junctions
exhibiting the superconducting diode effect. Taking into account multiple
Andreev reflection (MAR) processes in our scattering theory, we consid... | cond-mat_supr-con |
Size driven phase transitions in pinned vortex systems: We model a tridimensional vortex system in a sample with square superficial
pinning in the top surface and obtain the ground state structures as a function
of the sample thickness. Using a simple Frenkel-Kontorova like model and no
adjustable parameters, we reprod... | cond-mat_supr-con |
Epitaxial Growth of NdFeAsO Thin Films by Molecular Beam Epitaxy: Epitaxial films of NdFeAsO were grown on GaAs substrates by molecular beam
epitaxy (MBE). All elements including oxygen were supplied from solid sources
using Knudsen cells. The x-ray diffraction pattern of the film prepared with
the optimum growth condi... | cond-mat_supr-con |
Absence of the Pauli-Paramagnetic Limit in a Superconducting U$_6$Co: We performed $^{59}$Co nuclear magnetic resonance (NMR) measurements of
single-crystalline U$_6$Co. There is a small decrease in the Knight shift in
the superconducting (SC) state, but this change mainly arises from the SC
diamagnetic effect. The neg... | cond-mat_supr-con |
Theory of the Resistive Transition in Overdoped $Tl_2Ba_2CuO_{6+x}$:
Implications for the angular dependence of the quasiparticle scattering rate
in High-$T_c$ superconductors: We show that recent measurements of the magnetic field dependence of the
magnetization, specific heat and resistivity of overdoped $T_c \si... | cond-mat_supr-con |
Ultimate on-chip quantum amplifier: We report amplification of electromagnetic waves by a single artificial atom
in open 1D space. Our three-level artificial atom -- a superconducting quantum
circuit -- coupled to a transmission line presents an analog of a natural atom
in open space. The system is the most fundamental... | cond-mat_supr-con |
Highly responsive Y-Ba-Cu-O thin film THz detectors with picosecond time
resolution: High-temperature superconducting YBa2Cu3O7-d (YBCO) thin-film detectors with
improved responsivities were developed for fast time-domain measurements in the
THz frequency range. YBCO thin films of 30 nm thickness were patterned to
mi... | cond-mat_supr-con |
Stripe-like Inhomogeneities, Coherence, and the Physics of the High Tc
Cuprates: The carriers in the high-Tc cuprates are found to be polaron-like "stripons"
carrying charge and located in stripe-like inhomogeneities, "quasi-electrons"
carrying charge and spin, and "svivons" carrying spin and some lattice
distortion.... | cond-mat_supr-con |
A second phase transition and superconductivity in the beta-pyrochlore
oxide KOs2O6: Another phase transition that is probably of first order is found in the
beta-pyrochlore oxide superconductor KOs2O6 with a superconducting transition
temperature Tc of 9.6 K. It takes place at Tp=7.5 K in the superconducting
state i... | cond-mat_supr-con |
One-electron scattering rate and normal-state linear-$T$ resistivity of
the cuprates: Here we use a description of the electronic correlations contained in the
Hubbard model on the square-lattice perturbed by very weak three-dimensional
uniaxial anisotropy in terms of the residual interactions of charge $c$
fermions ... | cond-mat_supr-con |
Weyl superconductor phases in a Weyl-semimetal/superconductor multilayer: Topologically nontrivial superconducting phases have been engineered in
topological materials by the proximity effect in contact with conventional
superconductors. In this paper, by using the method of the Kronig-Penney model,
we study the superc... | cond-mat_supr-con |
Nodal band-off-diagonal superconductivity in twisted graphene
superlattices: The superconducting state and mechanism are among the least understood
phenomena in twisted graphene systems. For instance, recent tunneling
experiments indicate a transition between nodal and gapped pairing with
electron filling, which is n... | cond-mat_supr-con |
Critical Fields and Anisotropy of NdO0.82F0.18FeAs Single Crystals: The newly discovered iron-based superconductors have stimulated enormous
interests in the field of superconductivity. Since the new superconductor is a
layered system, the anisotropy is a parameter with the first priority to know.
Meanwhile any relevan... | cond-mat_supr-con |
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