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Two-component uniform spin susceptibility in superconducting
HgBa$_{2}$CuO$_{4+δ}$ single crystals determined with $^{63}$Cu and
$^{199}$Hg NMR: $^{63}$Cu and $^{199}$Hg NMR shifts for an optimally and underdoped
HgBa$_{2}$CuO$_{4+\delta}$ single crystal are reported, and the temperature
dependence dictates a two-c... | cond-mat_supr-con |
Fifty years of Hubbard and Anderson lattice models: from magnetism to
unconventional superconductivity - A brief overview: We briefly overview the importance of Hubbard and Anderson-lattice models as
applied to explanation of high-temperature and heavy-fermion superconductivity.
Application of the models during the l... | cond-mat_supr-con |
Doping Dependence of Anisotropic Resistivities in Trilayered
Superconductor Bi2Sr2Ca2Cu3O10+delta (Bi-2223): The doping dependence of the themopower, in-plane resistivity rho_ab(T),
out-of-plane resistivity rho_c(T), and susceptibility has been systematically
measured for high-quality single crystal Bi2Sr2Ca2Cu3O10+d... | cond-mat_supr-con |
Comparative study on the thermoelectric effect of parent oxypnictides
La$T$AsO ($T$ = Fe, Ni): The thermopower and Nernst effect were investigated for undoped parent
compounds LaFeAsO and LaNiAsO. Both thermopower and Nernst signal in iron-based
LaFeAsO are significantly larger than those in nickel-based LaNiAsO.
Fur... | cond-mat_supr-con |
Structure and Composition of the 200 K-Superconducting Phase of H2S
under Ultrahigh Pressure: The Perovskite (SH-)(H3S+): H2S is converted under ultrahigh pressure (> 110 GPa) to a metallic phase
that becomes superconducting with a record Tc of 200 K. It has been proposed
that the superconducting phase is body-center... | cond-mat_supr-con |
Superconductivity in boron-doped carbon nanotube networks: By using the five Angstrom diameter pores of calcined zeolite as the
template, we have fabricated boron doped carbon nanotube networks via the
chemical vapor deposition method. Raman data indicate the network to comprise
segments of interconnected carbon nano t... | cond-mat_supr-con |
Quantum phase-slips in Josephson junction rings: We study quantum phase-slip (QPS) processes in a superconducting ring
containing N Josephson junctions and threaded by an external static magnetic
flux. In a such system, a QPS consists of a quantum tunneling event connecting
two distinct classical states of the phases w... | cond-mat_supr-con |
Characterization of the superconducting phase in tellurium hydride at
high pressure: At present, hydrogen-based compounds constitute one of the most promising
classes of materials for applications as a phonon-mediated high-temperature
superconductors. Herein, the behavior of the superconducting phase in tellurium
hyd... | cond-mat_supr-con |
Probing pair-breaking mechanisms in proximity-induced hybrid
superconducting interfaces: Understanding depairing effects in a hybrid-superconducting interface
utilizing high spin-orbit materials such as topological insulators or 1D
semiconducting nanowires is becoming an important research topic in the study
of proxi... | cond-mat_supr-con |
Study of Local Nonlinear Properties Using a Near-Field Microwave
Microscope: We have developed a near-field microwave microscope to locally apply
microwave frequency currents and fields to superconductors, and dielectric
substrates, and measure the locally generated 2nd and 3rd harmonic responses.
We measure the loca... | cond-mat_supr-con |
Superconductivity from site-selective Ru doping studies in Zr$_5$Ge$_3$
compound: Systematical doping studies have been carried out to search for the possible
superconductivity in the transition metal doped Zr$_5$Ge$_3$ system.
Superconductivity up to 5.7K is discovered in the Ru-doped
Zr$_5$Ge$_{2.5}$Ru$_{0.5}$ samp... | cond-mat_supr-con |
Extracting phase information about the superconducting order parameter
from defect bound states: Impurity bound states and quasi-particle scattering from these can serve as
sensitive probes for identifying the pairing state of a superconducting
condensate. We introduce and discuss defect bound state quasi-particle
in... | cond-mat_supr-con |
Effective medium approximation and the complex optical properties of the
inhomogeneous superconductor K_{0.8}Fe_{2-y}Se_2: The in-plane optical properties of the inhomogeneous iron-chalcogenide
superconductor K_{0.8}Fe_{2-y}Se_2 with a critical temperature Tc = 31 K have
been modeled in the normal state using the Bru... | cond-mat_supr-con |
Flatband-Induced Itinerant Ferromagnetism in RbCo$_2$Se$_2$: $A$Co$_2$Se$_2$ ($A$=K,Rb,Cs) is a homologue of the iron-based
superconductor, $A$Fe$_2$Se$_2$. From a comprehensive study of RbCo$_2$Se$_2$
via measurements of magnetization, transport, neutron diffraction,
angle-resolved photoemission spectroscopy, and firs... | cond-mat_supr-con |
Hidden charge-conjugation, parity, and time-reversal symmetries and
massive Goldstone (Higgs) modes in superconductors: A massive Goldstone (MG) mode, often referred to as a Higgs amplitude mode,
is a collective excitation that arises in a system involving spontaneous
breaking of a continuous symmetry, along with a g... | cond-mat_supr-con |
Quasiparticle conductance in Spin Valve Josephson Structures: We study the quasiparticle current in clean ferromagnetic Josephson
structures of the form $S_1/F_1/N/F_2/S_2$, where $S$, $F$, and $N$ denote
superconducting, ferromagnetic or normal layers respectively. Our focus is on
the structure of the conductance $G$ ... | cond-mat_supr-con |
Reverse Monte Carlo study of apical Cu-O bond distortions in
YBa2Cu3O6.93: A combination of neutron total scattering measurement and reverse Monte Carlo
(RMC) refinement is applied to the study of apical Cu-O bond distortions in the
high-Tc superconductor YBa2Cu3O6.93. We show that the average structure is not
consis... | cond-mat_supr-con |
Evolution of vortex pinning in the FeSe$_{1-x}$S$_x$ system: We present a comprehensive study of vortex matter and pinning evolution in
the FeSe$_{1-x}$S$_x$ system with various doping degree. The influence of
sulphur substitution on vortex pinning and peak effect occurrence is studied.
We show that there is a complex ... | cond-mat_supr-con |
Elevated Tc levels in YBa2Cu3O6.5 modeled on a 3-dimensional doped bond
structure of chain and plane pairs: The complex phenomenology of shot quenched YBa2Cu3O6.5 with Tc=100K and 200K
levels is compared with laser pulsed analogs with an eye on explaining the
presumed Tc=552K of the latter. Shot quenching can produce... | cond-mat_supr-con |
Phases of Mott-Hubbard bilayers: A phase diagram of two Mott-Hubbard planes interacting with a short-range
Coulomb repulsion is presented. Considering the case of equal amount of doping
by holes in one layer as electrons in the other, a holon-doublon inter-layer
exciton formation is shown to be a natural consequence of... | cond-mat_supr-con |
Properties of the phonon-induced pairing interaction in
YBa$_2$Cu$_3$O$_7$ within the local density approximation: The properties of the phonon-induced interaction between electrons are
studied using the local density approximation (LDA). Restricting the electron
momenta to the Fermi surface we find generally that th... | cond-mat_supr-con |
Pressure induced metallization and possible unconventional
superconductivity in spin liquid $NaYbSe_{2}$: Beyond the conventional electron pairing mediated by phonons,
high-temperature superconductivity in cuprates is believed to stem from quantum
spin liquid (QSL). The unconventional superconductivity by doping a sp... | cond-mat_supr-con |
Weakly correlated electrons on a square lattice: a renormalization group
theory: We study the weakly interacting Hubbard model on the square lattice using a
one-loop renormalization group approach. The transition temperature T_c between
the metallic and (nearly) ordered states is found. In the parquet regime, (T_c
>>... | cond-mat_supr-con |
Superconducting d-wave stripes in cuprates: Valence bond order
coexisting with nodal quasiparticles: We point out that unidirectional bond-centered charge-density-wave states in
cuprates involve electronic order in both s- and d-wave channels, with
non-local Coulomb repulsion suppressing the s-wave component. The res... | cond-mat_supr-con |
Andreev reflection observation in Nb/FeSi/Nb and Nb/FeSi/Si/Nb Josephson
junctions: Electrical properties of Josephson junctions Nb/FeSi/Nb with
superconductor/ferromagnet (S/F)interfaces are presented. Due to Andreev
reflection the nearly exact quadruple enhancement of the tunnel junction
differential conductance co... | cond-mat_supr-con |
Time-Reversal-Symmetry-Broken Superconductivity Induced by Frustrated
Inter-Component Couplings: Superconductivity is associated with spontaneously broken gauge symmetry. In
some exotic superconductors the time-reversal symmetry is broken as well,
accompanied with internal magnetic field. A time-reversal symmetry bro... | cond-mat_supr-con |
Topological phase separation in 2D hard-core Bose-Hubbard system away
from half-filling: We suppose that the doping of the 2D hard-core boson system away from
half-filling may result in the formation of multi-center topological defect
such as charge order (CO) bubble domain(s) with Bose superfluid (BS) and extra
boso... | cond-mat_supr-con |
Dislocation Majorana zero modes in perovskite oxide 2DEG: Much of the current experimental efforts for detecting Majorana zero modes
have been centered on probing the boundary of quantum wires with strong
spin-orbit coupling. The same type of Majorana zero mode can also be realized
at crystalline dislocations in 2D sup... | cond-mat_supr-con |
Dispersion of the odd magnetic resonant mode in near-optimally doped
Bi2Sr2CaCu2O8+d: We report a neutron scattering study of the spin excitation spectrum in the
superconducting state of slightly overdoped Bi2Sr2CaCu2O8+d system (Tc=87 K).
We focus on the dispersion of the resonance peak in the superconducting state
... | cond-mat_supr-con |
Mo$_{3}$ReRuC: A noncentrosymmetric superconductor formed in the
MoReRu-Mo$_{2}$C system: A quaternary compound with the composition Mo$_{3}$ReRuC is obtained in a
previously unexplored MoReRu-Mo$_{2}$C system. According to x-ray structural
analysis, Mo$_{3}$ReRuC crystallizes in the noncentrosymmetric space group
$P... | cond-mat_supr-con |
Superconducting energy gap in $\rm Ba_{1-x}K_xBiO_3$: Temperature
dependence: The superconducting energy gap of $\rm Ba_{1-x}K_xBiO_3$ has been measured by
tunneling. Despite the fact that the sample was macroscopically single phase
with very sharp superconducting transition $T_c$ at 32~$K$, some of the
measured tunn... | cond-mat_supr-con |
Stability Conditions in Gapless Superconductors: Gapless superconductivity can arise when pairing occurs between fermion
species with different Fermi surface sizes, provided there is a sufficiently
large mismatch between Fermi surfaces and/or at sufficiently large coupling
constant. In gapless states, secondary Fermi s... | cond-mat_supr-con |
Aharonov-Bohm Effect for Quasiparticles around a Vortex Line in a D-wave
Superconductor: On the basis of the Bogolubov-de Gennes theory we develop an analytical
description of low-energy extended quasiparticle states around an isolated flux
line in a superconductor with gap nodes. The wavefunctions of these excitatio... | cond-mat_supr-con |
Magnetic resonance in a singlet-triplet Josephson junction: We study a singlet-triplet Josephson junction between a conventional s-wave
superconductor and an unconventional p$_{\rm x}$-wave superconductor. The
Andreev spectrum of the junction yields a spontaneous magnetization in
equilibrium. This allows manipulating t... | cond-mat_supr-con |
Anomalous lattice expansion of RuSr2Eu1.5Ce0.5Cu2O10(Ru-1222) magneto
superconductor: A low temperature X-ray diffraction study: This is the first report of the observation of the onset of excess volume and
also of the strain along the a-axis near the magnetic ordering temperature in
Ru-1222 superconductor, and indic... | cond-mat_supr-con |
Thin Spectrum States in Superconductors: We show that finite size superconductors have a spectrum of states at
extremely low energy, i.e. inside the superconducting gap. The presence of this
{\it thin spectrum} is a generic feature and related to the fact that in a
superconductor the global phase rotation symmetry is s... | cond-mat_supr-con |
Multiorbital effects on the transport and the superconducting
fluctuations in LiFeAs: The resistivity, Hall effect and transverse magnetoresistance (MR) have been
measured in low residual resistivity single crystals of LiFeAs. A comparison
with angle resolved photoemission spectroscopy and quantum oscillation data
im... | cond-mat_supr-con |
Temperature and field dependence of thermally activated flux flow
resistance in Bi2Sr2CaCu2O8+δ superconductor: We study the temperature dependence of the resistivity as a function of
magnetic field in superconducting transition (Tconset - TcR=0) region for
different Bi2Sr2CaCu2O8+{\delta} superconducting samples bei... | cond-mat_supr-con |
Continuous and reversible tuning of the disorder-driven
superconductor-insulator transition in bilayer graphene: The influence of static disorder on a quantum phase transition (QPT) is a
fundamental issue in condensed matter physics. As a prototypical example of a
disorder-tuned QPT, the superconductor-insulator tran... | cond-mat_supr-con |
The London moment: what a rotating superconductor reveals about
superconductivity: The London moment is the magnetic moment acquired by a rotating
superconductor. We propose that the London moment reveals the following
fundamental properties of the superconducting state: (i) superconductors
(unlike normal metals) kno... | cond-mat_supr-con |
Superconductivity of Cobalt in Thin Films: Due to competing long range ferromagnetic order, the transition metals Fe, Co
and Ni are not superconductors at ambient pressure. While superconductivity was
observed in a non-magnetic phase of Fe, stabilized under pressure, it is yet to
be discovered in Co and Ni under any ex... | cond-mat_supr-con |
Exact solution of the Lawrence-Doniach model in parallel magnetic fields: For the first time, we obtain the complete and exact analytical solution of
the Lawrence-Doniach model for layered superconductors in external parallel
magnetic fields. By solving a nontrivial mathematical problem of exact
minimization of the fre... | cond-mat_supr-con |
Emergent phenomena in multicomponent superconductivity: an introduction
to the focus issue: Multicomponent superconductivity is a novel quantum phenomenon in many
different superconducting materials, such as multiband ones in which different
superconducting gaps open in different Fermi surfaces, films engineered at t... | cond-mat_supr-con |
Reduction of electron repulsion and enhancement of $T_{c}$ in small
diffusive superconducting grains: The superconducting properties of small metallic grains has been a topic of
active research for half a century now. Early experiments demonstrated a
remarkable rise in the critical temperature, $T_{c}$, with reducing... | cond-mat_supr-con |
Doping evoluton of antiferromagnetic order and structural distortion in
LaFeAsO$_{1-x}$F$_x$: We use neutron scattering to study the structural distortion and
antiferromagnetic (AFM) order in LaFeAsO$_{1-x}$F$_{x}$ as the system is doped
with fluorine (F) to induce superconductivity. In the undoped state, LaFeAsO
exh... | cond-mat_supr-con |
The Berry curvature of the Bogoliubov quasiparticle Bloch states in the
unconventional superconductor Sr$_2$RuO$_4$: We will extend the concept of electron band Berry curvatures to
superconducting materials. We show that this can be defined for the
Bogoliubov-de Gennes equation describing the superconducting state in... | cond-mat_supr-con |
Field-driven transition in the Ba$_{1-x}$K$_x$Fe$_2$As$_2$
superconductor with splayed columnar defects: Through 2.6 GeV U irradiations, we have induced bimodal splayed columnar
defects in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ single crystals with splay angles, $\pm
5 ^\circ$, $\pm 10 ^\circ$, $\pm 15 ^\circ$, and $\pm 20 ^\ci... | cond-mat_supr-con |
Ginzburg-Landau theory for the time-dependent phase field in a
two-dimensional d-wave superconductor: We derive a finite temperature time-dependent effective theory for the phase
$\theta$ of the pairing field, which is appropriate for a 2D conducting
electron system with non-retarded d-wave attraction. As for s-wave ... | cond-mat_supr-con |
Even Parity, Orbital Singlet and Spin Triplet Pairing for
Superconducting $La(O_{1-x}F_x)FeAs$: In the present paper, we propose the parity even,orbital singlet and spin
triplet pairing state as the ground state of the newly discovered
super-conductor $LaO_{1-x}F_xFeAs$.The pairing mechanism involves both the
special... | cond-mat_supr-con |
Critical currents and vortex-unbinding transitions in quench-condensed
ultrathin films of Bismuth and Tin: We have investigated the I-V characteristics of strongly disordered
ultra-thin films of {\it Bi} and {\it Sn} produced by quench-condensation. Our
results show that both these sytems can be visualized as strongl... | cond-mat_supr-con |
Comment on `Strong Vortex Liquid Correlation' from Multiterminal
Measurements on Untwinned YBa$_2$Cu$_3$O$_{7-δ}$ Single Crystals': A.Rydh and \"O.Rapp [Phys. Rev. Lett. {\bf 86}, 1873 (2001).] claim that the
vortex liquid in untwinned YBa$_2$Cu$_3$O$_{7-\delta}$ crystals is correlated
above the melting transition, i... | cond-mat_supr-con |
Spin Excitation in d-wave Superconductors : A Fermi Liquid Picture: A detailed study of the Inelastic Neutron Scattering (INS) spectra of the
high-$T_c$ cuprates based on the Fermi liquid (FL) picture is given. We focus
on the issue of the transformation between the commensurate and incommensurate
(IC) excitation drive... | cond-mat_supr-con |
Cooper Pairing in A Doped 2D Antiferromagnet with Spin-Orbit Coupling: We study the two-dimensional Hubbard model with the Rashba type spin-orbit
coupling within and beyond the mean-field theory. The antiferromagnetic ground
state for the model at half-filling and the Cooper pairing induced by
antiferromagnetic spin fl... | cond-mat_supr-con |
Visualization of Electron Nematicity and Unidirectional Antiferroic
Fluctuations at High Temperatures in NaFeAs: The driving forces behind electronic nematicity in the iron pnictides remain
hotly debated. We use atomic-resolution variable-temperature scanning tunneling
spectroscopy to provide the first direct visual ... | cond-mat_supr-con |
Revisiting Anderson-Higgs mechanism: application of Lieb-Schultz-Mattis
theorem: We consider an electron model of superconductivity on a three-dimensional
lattice where there are on-site attractive Hubbard interaction and long-range
repulsive Coulomb interaction. It is claimed that fully gapped $s$-wave
superconducti... | cond-mat_supr-con |
Unveiling the hidden nematicity and spin subsystem in FeSe: The nematic order (nematicity) is considered one of the essential ingredients
to understand the mechanism of Fe-based superconductivity. In most Fe-based
superconductors (pnictides), nematic order is reasonably close to the
antiferromagnetic order. In FeSe, in... | cond-mat_supr-con |
Impurity effects on the spin excitation spectra in a d-wave
superconductor: The effects of nonmagnetic impurity on the spin excitation spectra in a
$d_{x^2-y^2}$-wave superconductor are examined, using the self-consistent
$t$-matrix approximation. It is shown that the impurity self-energy acts to
shift the position o... | cond-mat_supr-con |
Deviations from the extended London model at high magnetic fields in
YBa$_2$Cu$_3$O$_7$: We report on the evolution with magnetic field and temperature of the vortex
lattice (VL) in fully-oxygenated YBa2Cu3O7 as studied by time-of-flight small
angle neutron scattering. Using the HFM/EXED beamline, we have obtained da... | cond-mat_supr-con |
Organic Superconductors: when correlations and magnetism walk in: This survey provides a brief account for the start of organic
superconductivity motivated by the quest for high Tc superconductors and its
development since the eighties'. Besides superconductivity found in 1D organics
in 1980, progresses in this field o... | cond-mat_supr-con |
Normal State Nernst Effect in Electron-doped Pr2-xCexCuO4:
Superconducting Fluctuations and Two-band Transport: We report a systematic study of normal state Nernst effect in the
electron-doped cuprates Pr$_{2-x}$Ce$_x$CuO$_{4-\delta}$ over a wide range of
doping (0.05$\leq x \leq$0.21) and temperature. At low tempera... | cond-mat_supr-con |
An elastic lattice in a random potential: Using Monte Carlo simulations, we study the properties of an elastic
triangular lattice subject to a random background potential. As the cooling
rate is reduced, we observe a rather sudden crossover between two different
glass phases, one with exponential decay of correlations,... | cond-mat_supr-con |
High-pressure flux growth, structural, and superconducting properties of
LnFeAsO (Ln = Pr, Nd, Sm) single crystals: Single crystals of the LnFeAsO (Ln1111, Ln = Pr, Nd, and Sm) family with
lateral dimensions up to 1 mm were grown from NaAs and KAs flux at high
pressure. The crystals are of good structural quality and... | cond-mat_supr-con |
Absence of Cooper-type bound states in three- and few-electron systems: It is shown that the appearance of a fixed-point singularity in the kernel of
the two-electron Cooper problem is responsible for the formation of the Cooper
pair for an arbitrarily weak attractive interaction between two electrons. This
singularity... | cond-mat_supr-con |
Observation of the Nernst signal generated by fluctuating Cooper pairs: Long-range order is destroyed in a superconductor warmed above its critical
temperature (Tc). However, amplitude fluctuations of the superconducting order
parameter survive and lead to a number of well established phenomena such as
paraconductivity... | cond-mat_supr-con |
AC losses in macroscopic thin-walled superconducting niobium cylinders: Measurements of the ac response represent a widely-used method for probing
the properties of superconductors. In the surface superconducting state (SSS),
increase of the current beyond the surface critical current $I_c$ leads to
breakdown of SSS an... | cond-mat_supr-con |
Columnar defects acting as passive internal field detectors: We have studied the angular dependence of the irreversible magnetization of
several YBa$_2$Cu$_3$O$_7$ and 2H-NbSe$_2$ single crystals with columnar
defects tilted off the c-axis. At high magnetic fields, the irreversible
magnetization $M_i(\Theta_H)$ exhibit... | cond-mat_supr-con |
Roles of anisotropic and unequal gaps in the quasiparticle interference
of superconducting iron pnictides: We investigate the role of gap characteristics such as anisotropy and
inequality of the gaps in the quasiparticle interferences of iron pnictides
using a five-orbital tight-binding model. We examine how the diff... | cond-mat_supr-con |
Possible realization of an antiferromagnetic Griffiths phase in
Ba[Fe(1-x)Mn(x)](2)As(2): We investigate magnetic ordering in metallic Ba[Fe(1-x)Mn(x)](2)As(2) and
discuss the unusual magnetic phase, which was recently discovered for Mn
concentrations x > 10%. We argue that it can be understood as a Griffiths-type
ph... | cond-mat_supr-con |
Superconductivity in High-Entropy-Alloy Telluride AgInSnPbBiTe5: A polycrystalline sample of the high-entropy-alloy-type telluride
AgInSnPbBiTe5 was synthesized using high-pressure synthesis. Superconductivity
with a transition temperature (Tc) of 2.6 K was observed in AgInSnPbBiTe5.
Elemental and structural analyses r... | cond-mat_supr-con |
Anomalous doping dependence of the fluctuation-induced diamagnetism in
superconductors of YBCO family: SQUID magnetization measurements in oriented powders of Y$_{1-x}$Ca$_{x}$Ba$%
_{2}$Cu$_{3}$O$_{y}$, with $x$ ranging from 0 to 0.2, for $y\approx 6.1$ and
$y\approx 6.97$, have been performed in order to study the d... | cond-mat_supr-con |
The Field Perturbation Theory of Pseudogaps in HTSC: Here I establish the field perturbation theory of pseudogaps in HTSC. The
proposed ground state suggests an internal particle-hole field, which is normal
to nesting surfaces, and having twice the Fermi wave-number. It is proved that
the system violates momentum conse... | cond-mat_supr-con |
Effect of superlattice modulation of electronic parameters on
superconducting density of states in cuprate superconductors: Recent scanning tunneling microscopy on BSCCO 2212 has revealed a substantial
spatial supermodulation of the energy gap in the superconducting state. We
propose that this gap modulation is due t... | cond-mat_supr-con |
Evidence for Pauli-limiting behaviour at high fields and enhanced upper
critical fields near T_c in several disordered FeAs based Superconductors: We report resistivity and upper critical field B_c2(T) data for disordered
(As deficient) LaO_0.9F_0.1FeAs_1-delta in a wide temperature and high field
range up to 60 T. T... | cond-mat_supr-con |
Microstructural and transport properties of superconducting
FeTe0.65Se0.35 crystals: The issue concerning the nature and the role of microstructural
inhomogeneities in iron chalcogenide superconducting crystals of FeTe0.65Se0.35
and their correlation with transport properties of this system was addressed.
Presented d... | cond-mat_supr-con |
Periodicity of magnetization reversals in $\varphi_0$ Josephson junction: The magnetization reversal in ${\varphi_0}$-Josephson junction with direct
coupling between magnetic moment and Josephson current has been studied. By
adding pulse signal, the dynamics of magnetic moment components have been
simulated and the ful... | cond-mat_supr-con |
Quantum vortex fluctuations in cuprate superconductors: We study the effects of quantum vortex fluctuations in two-dimensional
superconductors using a dual theory of vortices, and investigate the relevance
to underdoped cuprates where the superconductor-insulator transition (SIT) is
possibly driven by quantum vortex pr... | cond-mat_supr-con |
Energy gaps in high-$T_c$ superconductors: BCS after all?: A major impediment to solving the problem of high-$T_c$ superconductivity is
the ongoing confusion about the magnitude, structure and doping dependence of
the superconducting gap, $\Delta_0$, and of the mysterious pseudogap found in
underdoped samples\cite{Tall... | cond-mat_supr-con |
Stretched exponential spin relaxation in organic superconductors: Proton NMR measurements on the organic superconductor
$\kappa-(ET)_2Cu[N(CN)_2]Br$ ($T_C = 11.6$ K) exhibit stretched exponential
spin-lattice relaxation below $T\approx 25$ K, suggestive of an inhomogeneous
magnetic phase that develops in the normal sta... | cond-mat_supr-con |
Tunneling Studies of Pseudogaps: a Comment: Recent tunneling observations of a pseudogap in Bi_2Sr_2CaCu_2O_{8+delta} are
not necessarily evidence that the pseudogap is associated with superconducting
fluctuations. The data are here analyzed as a competition between
superconductivity and a density wave (taken as a simp... | cond-mat_supr-con |
Hole-Doped Room-Temperature Superconductivity in H$_{3}$S$_{1-x}$Z$_x$
(Z=C, Si): We examine the effects of the low-level substitution of S atoms by C and Si
atoms on the superconductivity of H$_3$S with the $Im\bar{3}m$ structure at
megabar pressure. The hole doping can fine-tune the Fermi energy to reach the
electr... | cond-mat_supr-con |
The Superfluid Glass Phase of 3He-A: It is established theoretically that an ordered state with continuous
symmetry is inherently unstable to arbitrarily small amounts of disorder [1,
2]. This principle is of central importance in a wide variety of condensed
systems including superconducting vortices [3, 4], Ising spin... | cond-mat_supr-con |
Effective Vortex Pinning in MgB2 thin films: We discuss pinning properties of MgB2 thin films grown by pulsed-laser
deposition (PLD) and by electron-beam (EB) evaporation. Two mechanisms are
identified that contribute most effectively to the pinning of vortices in
randomly oriented films. The EB process produces low de... | cond-mat_supr-con |
Electronic structure, lattice dynamics and magnetism of new ThXAsN
(X=Fe,Co,Ni) superconductors: A First Principles Study: In this work, we present a comparative first principles study of mechanical
properties, electronic structure, phonon dispersion relation, electron-phonon
coupling and magnetism in three isostruct... | cond-mat_supr-con |
2D orbital-like magnetic order in ${\rm La_{2-x}Sr_xCuO_4}$: In high temperature copper oxides superconductors, a novel magnetic order
associated with the pseudogap phase has been identified in two different
cuprate families over a wide region of temperature and doping. We here report
the observation below 120 K of a s... | cond-mat_supr-con |
Tunable nodal kagome superconductivity in charge ordered RbV3Sb5: Unconventional superconductors often feature competing orders, small
superfluid density, and nodal electronic pairing. While unusual
superconductivity has been proposed in the kagome metals AV3Sb5, key
spectroscopic evidence has remained elusive. Here we... | cond-mat_supr-con |
The decrease of the critical current of coated conductors when a
perpendicular magnetic field is applied : a Josephson effect point of view: A large decrease is observed in the critical current density of YBCO coated
conductors (CC) and related compounds when a strong perpendicular magnetic
field is applied. While me... | cond-mat_supr-con |
In-Plane and Out-of-Plane Optical Properties of NdBa2Cu3Ox Single
Crystals close to x = 7.0: We present results of reflectivity measurements with E parallel to c and E
perpendicular to c on NdBa2Cu3Ox (Nd123) single crystals close to full oxygen
doping. Along the c-axis the optical conductivity shows a well developed... | cond-mat_supr-con |
Nesting, spin-fluctuations, and odd-gap superconductivity in NaxCoO2
yH2O: We have calculated the one-electron susceptibility of hydrated NaxCoO2 and
find strong nesting nearly commensurate with a 2X2 superstructure. The nesting
involves about 70% of all electrons at the Fermi level and is robust with
respect to dopi... | cond-mat_supr-con |
Probing the electron-phonon interaction in correlated systems with
coherent lattice fluctuation spectroscopy: Tailoring the properties of correlated oxides is accomplished by chemical
doping, pressure, temperature or magnetic field. Photoexcitation is a valid
alternative to reach out-of-equilibrium states otherwise i... | cond-mat_supr-con |
Superconductivity and unusual magnetic behavior in amorphous carbon: Traces of superconductivity (SC) at elevated temperatures (up to 65 K) were
observed by magnetic measurements in three different inhomogeneous sulfur doped
amorphous carbon (a-C) systems: (a) in commercial and (b) synthesized powders
and (c) in a-C th... | cond-mat_supr-con |
Nature of 45 degree vortex lattice reorientation in tetragonal
superconductors: The transformation of the vortex lattice in a tetragonal superconductor which
consists of its 45 degree reorientation relative to the crystal axes is studied
using the nonlocal London model. It is shown that the reorientation occurs as
tw... | cond-mat_supr-con |
Possible Triplet Superconducting Order in Magnetic Superconducting Phase
induced by Paramagnetic Pair-Breaking: Motivated by recent thermal conductivity measurements in the superconductor
CeCoIn5, we theoretically examine a possible staggered spin-triplet
superconducting order to be induced by the coupled spin-densit... | cond-mat_supr-con |
Half-quantum vortex and d-soliton in Sr$_2$RuO$_4$: Assuming that the superconductivity in Sr$_2$RuO$_4$ is described by a planar
p-wave order parameter, we consider possible topological defects in
Sr$_2$RuO$_4$. In particular, it is shown that both of the ${\hat d}$-soliton
and half-quantum vortex can be created in th... | cond-mat_supr-con |
Uniaxial "nematic-like" electronic structure and Fermi surface of
untwinned CaFe2As2: Obtaining the electronic structure of the newly discovered iron-based
superconductors is the key to understanding the mechanism of their
high-temperature superconductivity. We used angle-resolved photoemission
spectroscopy (ARPES) t... | cond-mat_supr-con |
Theory of the superconductivity of $UGe_2$ revisited: We present a unified theory of magnetism and superconductivity of $UGe_2$. To
this end, we consider part of $5f$ uranium electrons as mostly itinerant and
other ones as mostly localized. The main feature that distinguishes the
localized from the itinerant electrons ... | cond-mat_supr-con |
Fractal superconductivity near localization threshold: We develop a semi-quantitative theory of electron pairing and resulting
superconductivity in bulk "poor conductors" in which Fermi energy $E_F$ is
located in the region of localized states not so far from the Anderson mobility
edge $E_c$. We review the existing the... | cond-mat_supr-con |
Structural phase transition and superlattice misfit strain of RFeAsO (R
= La, Pr, Nd and Sm): The tetragonal-to-orthorhombic structural phase transition (SPT) in LaFeAsO
(La-1111) and SmFeAsO (Sm-1111) single crystals measured by high resolution
x-ray diffraction is found to be sharp while the RFeAsO (R=La, Nd, Pr, S... | cond-mat_supr-con |
Quantum mechanics of superconducting nanowires: In a short superconducting nanowire connected to bulk superconducting leads,
quantum phase slips behave as a system of linearly (as opposed to
logarithmically) interacting charges. This system maps onto quantum mechanics
of a particle in a periodic potential. We show that... | cond-mat_supr-con |
Nematic state stabilized by off-site Coulomb interaction in iron-based
superconductors: Using a variational Monte Carlo method, we investigate the nematic state in
iron-base superconductors based on a three-band Hubbard model. Our results
demonstrate that the nematic state, formed by introducing an anisotropic
hoppin... | cond-mat_supr-con |
Transition Temperature and Upper Critical Field in SmFeAsO1-xFx
Synthesized at Low Heating Temperatures: Low-temperature synthesis is a promising and potentially effective method for
improving superconducting properties. We report on the fabrication of
polycrystalline samples of SmFeAsO1-xFx with nominal x content va... | cond-mat_supr-con |
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