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Generalized boundary conditions for the circuit theory of mesoscopic
transport: The circuit theory of mesoscopic transport provides a unified framework to
describe spin-dependent or superconductivity-related phenomena. We extend this
theory to hybrid systems of normal metals, ferromagnets and superconductors.
Our mai... | cond-mat_supr-con |
On the roles of graphene oxide doping for enhanced supercurrent in MgB2
based superconductors: Due to their graphene-like properties after oxygen reduction, incorporation
of graphene oxide (GO) sheets into correlated-electron materials offers a new
pathway for tailoring their properties. Fabricating GO nanocomposites... | cond-mat_supr-con |
The underdoped-overdoped transition in YBa_2Cu_3O_x: Oxygen doping in metallic YBa_2Cu_3O_x induces quadrupolar "alpha-ortho'',
and breathing "beta-ortho" deformations of the CuO_2 planes. Breathing
beta-ortho deformations favour hybridizations of the pd sigma Cu3d_x^2-y^2 -
O2p_x,y with the pd pi Cu3d_x,z, 3d_y,z-O2p_... | cond-mat_supr-con |
Magnetization Measurement of a Possible High-Temperature Superconducting
State in Amorphous Carbon Doped with Sulfur: Magnetization M(T,H) measurements performed on thoroughly characterized
commercial amorphous carbon powder doped with sulfur (AC-S), revealed the
occurrence of an inhomogeneous superconductivity (SC) ... | cond-mat_supr-con |
Coexistence of orbital degeneracy lifting and superconductivity in
iron-based superconductors: In contrast to conventional superconducting (SC) materials, superconductivity
in high-temperature superconductors (HTCs) usually emerges in the presence of
other fluctuating orders with similar or higher energy scales, thus... | cond-mat_supr-con |
Nonlatching Superconducting Nanowire Single-Photon Detection with
Quasi-Constant-Voltage Bias: Latching is a serious issue in superconducting nanowire single-photon
detector (SNSPD) technology. By extensively studying the electrical
transportation characteristics of SNSPD with different bias schemes, we
conclude that... | cond-mat_supr-con |
Anomalous Fano factor as a signature of Bogoliubov Fermi surfaces: Noise spectroscopy is a key technique to investigate the nature and dynamics
of charge carriers in superconductors. The recently discovered superconducting
hybrids with Bogoliubov Fermi surfaces exhibit a particularly intriguing and
rich charge dynamics... | cond-mat_supr-con |
Josephson junctions of topological nodal superconductors: Transition metal dichalcogenides (TMDs) offer a unique platform to study
unconventional superconductivity, owing to the presence of strong spin-orbit
coupling and a remarkable stability to an in-plane magnetic field. A recent
study found that when an in-plane fi... | cond-mat_supr-con |
High-temperature surface superconductivity in rhombohedral graphite: Surface superconductivity in rhombohedral graphite is a robust phenomenon
which can exist even when higher order hoppings between the layers lift the
topological protection of the surface flat band and introduce a quadratic
dispersion of electrons wit... | cond-mat_supr-con |
Competing Superconducting States in Strong Ferromagnets: We report results from a systematic study of the competition of exotic
triplet pair density wave (PDW) superconductivity (SC) with homogeneous (zero
pair momentum) SC in strongly polarized media such as half metallic systems.
From the two different PDW states all... | cond-mat_supr-con |
Thermodynamic signatures of quantum criticality in cuprates: The three central phenomena of cuprate superconductors are linked by a common
doping $p^{\star}$, where the enigmatic pseudogap phase ends, around which the
superconducting phase forms a dome, and at which the resistivity exhibits an
anomalous linear dependen... | cond-mat_supr-con |
Theory of thermally activated vortex bundles flow over the
directional-dependent potential barriers in type-II superocnductors: The thermally activated vortex bundle flow over the directional-dependent
energy barrier in type-II superconductors is investigated. The coherent
oscillation frequency and the mean direction... | cond-mat_supr-con |
Bound states and impurity averaging in unconventional superconductors: The question of anomalous transport due to a band of impurity states in
unconventional superconductors is discussed. In general, the bound state
energies are not in midgap, even in the unitarity limit. This implies that,
generically, the states asso... | cond-mat_supr-con |
Existence of the Abrikosov vortex state in two-dimensional type-II
superconductors without pinning: Theory alternative to the vortex lattice melting theories is advertised. The
vortex lattice melting theories are science fiction cond-mat/9811051 because
the Abrikosov state is not the vortex lattice with crystalline l... | cond-mat_supr-con |
Suppression of Tunneling of Superconducting Vortices Caused by a Remote
Gate: Example of an Extended Object Tunneling: We discuss a recent experiment in which the resistance of a superconducting
film has been measured in magnetic field. A strong decrease of the
superconducting film resistance has been observed when a... | cond-mat_supr-con |
Role of Sb in the superconducting kagome metal CsV$_3$Sb$_5$ revealed by
its anisotropic compression: Pressure evolution of the superconducting kagome metal CsV$_3$Sb$_5$ is
studied with single-crystal x-ray diffraction and density-functional
band-structure calculations. A highly anisotropic compression observed up t... | cond-mat_supr-con |
Energy dependence of a vortex line length near a zigzag of pinning
centers: A vortex line, shaped by a zigzag of pinning centers, is described here
through a three-dimensional unit cell containing two pinning centers positioned
symmetrically with respect to its center. The unit cell is a cube of side
$L=12\xi$, the p... | cond-mat_supr-con |
Searching for Superconductivity in High Entropy Oxide Ruddlesden-Popper
Cuprate Films: In this work, the high entropy oxide A2CuO4 Ruddlesden-Popper
(La0.2Pr0.2Nd0.2Sm0.2Eu0.2)2CuO4 is explored by charge doping with Ce+4 and
Sr+2 at concentrations known to induce superconductivity in the simple parent
compounds, Nd2C... | cond-mat_supr-con |
Tunneling spectroscopy for ferromagnet/superconductor junctions: In tunneling spectroscopy studies of ferromagnet/superconductor (F/S)
junctions, the effects of spin polarization, Fermi wavevector mismatch (FWM)
between the F and S regions, and interfacial resistance play a crucial role. We
study the low bias conductan... | cond-mat_supr-con |
Suppression of surface barrier in superconductors by columnar defects: We investigate the influence of columnar defects in layered superconductors
on the thermally activated penetration of pancake vortices through the surface
barrier. Columnar defects, located near the surface, facilitate penetration of
vortices throug... | cond-mat_supr-con |
Detection of Geometric Phases in Flux Qubits with Coherent Pulses: We propose a experimentally feasible scheme to demonstrate the geometric
phase in flux qubits by means of detuning coherent microwave pulse techniques.
Through measuring the probability of the persistent current state in flux
qubits, one can detect the ... | cond-mat_supr-con |
Probing the Order Parameter of Superconducting LiFeAs using Pb/LiFeAs
and Au/LiFeAs Point-Contact Spectroscopy: We have fabricated c-axis point contact junctions between high-quality LiFeAs
single crystals and Pb or Au tips in order to study the nature of the
superconducting order parameter of LiFeAs, one of the few ... | cond-mat_supr-con |
Josephson current through a long quantum wire: The dc Josephson current through a long SNS junction receives contributions
from both Andreev bound states localized in the normal region as well as from
scattering states incoming from the superconducting leads. We show that in the
limit of a long junction, this current, ... | cond-mat_supr-con |
Electronic structure of new quaternary superconductors LaONiBi and
LaOCuBi from first principles: Based on first-principles FLAPW-GGA calculations, we have investigated the
electronic structure of newly synthesized novel superconductors LaONiBi and
LaOCuBi, the first bismuth-containing compounds from the family of qu... | cond-mat_supr-con |
Josephson critical currents in annular superconductors with Pearl
vortices: We investigate the influence of Pearl vortices in the vicinity of an
edge-type Josephson junction for a superconducting thin-film loop in the form
of an annulus, under uniform magnetic field. Specifically, we obtain the exact
analytic formula... | cond-mat_supr-con |
Band-selective clean- and dirty-limit superconductivity with nodeless
gaps in the bilayer iron-based superconductor CsCa$_2$Fe$_4$As$_4$F$_2$: The optical properties of the new iron-based superconductor
CsCa$_2$Fe$_4$As$_4$F$_2$ with $T_c \sim 29$~K have been determined. In the
normal state a good description of the ... | cond-mat_supr-con |
Evidence from $^{77}$Se Knight shifts for triplet superconductivity in
(TMTSF)$_2$PF$_6$: The layered quasi-one-dimensional molecular superconductor (TMTSF)$_2$PF$_6$
is a very exotic material with a superconducting order parameter whose ground
state symmetry has remained ill-defined. Here we present a pulsed NMR Kni... | cond-mat_supr-con |
Complete zero-energy flat bands of surface states in fully gapped chiral
noncentrosymmetric superconductors: Noncentrosymmetric superconductors can support flat bands of zero-energy
surface states in part of their surface Brillouin zone. This requires that they
obey time-reversal symmetry and have a sufficiently stro... | cond-mat_supr-con |
Superconductivity in novel BiS2-based layered superconductor
LaO1-xFxBiS2: Layered superconductors have provided some interesting fields in condensed
matter physics owing to the low dimensionality of their electronic states. For
example, the high-Tc (high transition temperature) cuprates and the Fe-based
superconduct... | cond-mat_supr-con |
Advanced surface characterization of
Ba(Fe$_{0.92}$Co$_{0.08}$)$_2$As$_2$ epitaxial thin films: We report on the systematic characterization of
Ba(Fe$_{0.92}$Co$_{0.08}$)$_2$As$_2$ epitaxial thin films on CaF$_2$ substrate
in view of their possible use for superconducting electronic applications. By
using different a... | cond-mat_supr-con |
Superconductivity and abnormal pressure effect in Sr0.5La0.5FBiSe2
superconductor: Through the solid state reaction method, we synthesized a new BiSe2-based
superconductor Sr0:5La0:5FBiSe2 with superconducting transition temperature
Tc?3.8 K. A strong diamagnetic signal below Tc in susceptibility ?(T) is
observed ind... | cond-mat_supr-con |
Majorana spintronics: We propose a systematic magnetic-flux-free approach to detect, manipulate and
braid Majorana fermions in a semiconductor nanowire-based topological Josephson
junction by utilizing the Majorana spin degree of freedom. We find an intrinsic
$\pi$-phase difference between spin-triplet pairings enforce... | cond-mat_supr-con |
Magnetism in SQUIDs at Millikelvin Temperatures: We have characterized the temperature dependence of the flux threading dc
SQUIDs cooled to millikelvin temperatures. The flux increases as 1/T as
temperature is lowered; moreover, the flux change is proportional to the
density of trapped vortices. The data is compatible ... | cond-mat_supr-con |
In-situ fabrication of cobalt-doped SrFe2As2 thin films by using pulsed
laser deposition with excimer laser: The remarkably high superconducting transition temperature and upper critical
field of iron(Fe)-based layered superconductors, despite ferromagnetic material
base, open the prospect for superconducting electro... | cond-mat_supr-con |
Quantum Phase Transitions in Superconducting Arrays with General
Capacitance Matrices: We investigate quantum phase transitions in two-dimensional superconducting
arrays with general capacitance matrices and discrete charge states. We use the
perturbation theory together with the simulated annealing method to obtain ... | cond-mat_supr-con |
Quasiparticle entropy in superconductor/normal metal/superconductor
proximity junctions in the diffusive limit: We discuss the quasiparticle entropy and heat capacity of a dirty
superconductor-normal metal-superconductor junction. In the case of short
junctions, the inverse proximity effect extending in the supercond... | cond-mat_supr-con |
Amplitude `Higgs' mode in 2H-NbSe2 Superconductor: We report experimental evidences for the observation of the superconducting
amplitude mode, so-called `Higgs' mode in the charge density wave
superconductor 2H-NbSe2 using Raman scattering. By comparing 2H-NbSe2 and its
iso-structural partner 2H-NbS2 which shows superc... | cond-mat_supr-con |
Colossal thermomagnetic response in the exotic superconductor URu2Si2: When a superconductor is heated above its critical temperature $T_c$,
macroscopic coherence vanishes, leaving behind droplets of thermally
fluctuating Cooper pair. This superconducting fluctuation effect above $T_c$
has been investigated for many de... | cond-mat_supr-con |
Characterizing two-dimensional superconductivity via nanoscale noise
magnetometry with single-spin qubits: We propose nanoscale magnetometry via isolated single-spin qubits as a probe
of superconductivity in two-dimensional materials. We characterize the magnetic
field noise at the qubit location, arising from curren... | cond-mat_supr-con |
Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk
Superconductor and Single-Layer FeSe/SrTiO3 Films: The mechanism of high temperature superconductivity in the iron-based
superconductors remains an outstanding issue in condensed matter physics. The
electronic structure, in particular the Fermi surfa... | cond-mat_supr-con |
Multiband superconductivity and a deep gap minimum from the specific
heat in KCa$_2$(Fe$_{1-x}$Ni$_x$)$_4$As$_4$F$_2$ ($x$ = 0, 0.05, 0.13): Specific heat can explore low-energy quasiparticle excitations of
superconductors, so it is a powerful tool for bulk measurement on the
superconducting gap structure and pairing... | cond-mat_supr-con |
Strain-driven nematicity of the odd-parity superconductivity in
Sr$_x$Bi$_2$Se$_3$: We present a novel experimental evidence for the odd-parity nematic
superconductivity in high-quality single crystals of doped topological
insulator Sr$_x$Bi$_2$Se$_3$. The X-ray diffraction shows that the grown single
crystals are ei... | cond-mat_supr-con |
Chiral and helical $p$-wave superconductivity in doped bilayer BiH: We investigate the superconductivity (SC) driven by correlation effects in
electron-doped bilayer BiH near a type-II van Hove singularity (vHS). By
functional renormalization group, we find triplet $p$-wave pairing prevails in
the interaction parameter... | cond-mat_supr-con |
Instability of Majorana states in Shiba chains due to leakage into a
topological substrate: We revisit the problem of Majorana states in chains of scalar impurities
deposited on a superconductor with a mixed s-wave and p-wave pairing. We also
study the formation of Majorana states for magnetic impurity chains. We fin... | cond-mat_supr-con |
Mixed higher-order topology and nodal and nodeless flat band topological
phases in a superconducting multiorbital model: We investigate the topological phases that appear in an orbital version of
the Benalcazar-Bernevig-Hughes (BBH) model in the presence of conventional
spin-singlet $s$-wave superconductivity and wit... | cond-mat_supr-con |
Spin Transport in Half-Metallic Ferromagnet-Superconductor Junctions: We investigate the charge and spin transport in half-metallic ferromagnet
($F$) and superconductor ($S$) nanojunctions. We utilize a self-consistent
microscopic method that can accommodate the broad range of energy scales
present, and ensures proximi... | cond-mat_supr-con |
Hall coefficient and angle-resolved photoemission in systems with strong
pair fluctuations: We examine the normal-state temperature and doping dependence of the Hall
coefficient in the context of a pair-fluctuation scenario, based on a model
where itinerant electrons are hybridized with localized electron pairs via a... | cond-mat_supr-con |
From Cooper-pair glass to unconventional superconductivity: a unified
approach to cuprates and pnictides: We report a microscopic model wherein the unconventional superconductivity
emerges from an incoherent `Cooper-pair glass' state. Driven by the pair-pair
interaction, a new type of quasi-Bose phase transition is a... | cond-mat_supr-con |
Resilience of d-wave superconductivity to nearest-neighbor repulsion: Many theoretical approaches find d-wave superconductivity in the prototypical
one-band Hubbard model for high-temperature superconductors. At strong-coupling
(U > W, where U is the on-site repulsion and W=8t the bandwidth) pairing is
controlled by th... | cond-mat_supr-con |
Key Ingredients for Superconductivity in Cuprates: Using high resolution angle-resolved photoemission data in conjunction with
that from neutron and other probes, we show that electron-phonon (el-ph)
coupling is strong in cuprates superconductors and it plays an important role
in pairing. In addition to the strong elec... | cond-mat_supr-con |
Interplay between magnetism and superconductivity in EuFe(2-x)Co(x)As2
studied by 57Fe and 151Eu Mössbauer spectroscopy: The compound EuFe(2-x)Co(x)As2 was investigated by means of the 57Fe and
151Eu Moessbauer spectroscopy versus temperature (4.2 - 300 K) for x=0
(parent), x=0.34 - 0.39 (superconductor) and x=0.58 (... | cond-mat_supr-con |
Resistive transition in disordered superconductors with varying
intergrain coupling: The effect of disorder is investigated in granular superconductive materials
with strong and weak links. The transition is controlled by the interplay of
the \emph{tunneling} $g$ and \emph{intragrain} $g_{intr}$ conductances, which
d... | cond-mat_supr-con |
Superconductivity of cerium under pressures up to 54GPa: Cerium is a fascinating element due to its diverse physical properties, which
include forming various crystal structures ($\gamma$, $\alpha$, $\alpha^{'}$,
$\alpha^{''}$ and $\epsilon$), mixed valence behavior and superconductivity,
making it an ideal platform fo... | cond-mat_supr-con |
Surface states and local spin susceptibility in doped three-dimensional
topological insulators with odd-parity superconducting pairing symmetry: We investigate characteristic features in the spin response of doped
three-dimensional topological insulators with odd-parity unequal-spin
superconducting pairing, which are... | cond-mat_supr-con |
Charge distribution in C$_{60}$ crystal doped by electric field: The calculations of the charge distribution in C$_{60}$-based FET structure
are presented. A simple model is proposed to describe the distribution of the
injected electrons or holes between two-dimensional layers. The calculations
show that the relative c... | cond-mat_supr-con |
Half-integer Shapiro-steps in superconducting qubit with a
$π$-Josephson junction: A superconducting quantum interference device (SQUID) comprising 0- and
$\pi$-Josephson junctions (JJs), called $\pi$-SQUID, is studied by the
resistively shunted junction model. The $\pi$-SQUID shows half-integer
Shapiro-steps (SS) un... | cond-mat_supr-con |
Controlling Factors of Tc-Dome Structure in 1111-Type Iron Arsenide
Superconductors: We investigated the effects of phosphorus substitution on the shape of the
Tc(x) dome in 1111-type SmFeAs1-yPyO1-xHx (0 < x < 0.5). Hydride ion
substitution of oxide sites (O2- -> H-) exerts a chemical pressure effect,
i.e., a struct... | cond-mat_supr-con |
Properties of a two orbital model for oxypnictide superconductors:
Magnetic order, B_2g spin-singlet pairing channel, and its nodal structure: A two orbital model for the new Fe-based superconductors is studied using the
Lanczos method as well as pairing mean-field approximations. Our main goals are
(i) to provide a ... | cond-mat_supr-con |
Doping dependent optical properties of Bi2201: An experimental study of the in-plane optical conductivity of
(Pb$_{x}$,Bi$_{2-x}$)(La$_{y}$Sr$_{2-y}$)CuO$_{6+\delta}$ (Bi2201) is presented
for a broad doping and temperature range. The in-plane conductivity is analyzed
within a strong coupling formalism. We address the ... | cond-mat_supr-con |
Proximity of LaOFeAs to a magnetic instability: We investigate the effect of external pressure on the Fe magnetic moment in
undoped LaOFeAs within the framework of density functional theory and show that
this system is close to a magnetic instability: The Fe moment is found to drop
by nearly a factor of 3 within a pres... | cond-mat_supr-con |
Local characterization of superconductivity in BaFe2(As1-xPx)2: We use magnetic force microscopy (MFM) to characterize superconductivity
across the superconducting dome in ${\rm {BaFe}_2 \left(As_{1-x}P_x\right)_2}$,
a pnictide with a peak in the penetration depth ($\lambda_{ab}$) at optimal
doping ($\rm x_{opt}$), as ... | cond-mat_supr-con |
Controlling spin supercurrents via nonequilibrium spin injection: We propose a mechanism whereby spin supercurrents can be manipulated in
superconductor/ferromagnet proximity systems via nonequilibrium spin injection.
We find that if a spin supercurrent exists in equilibrium, a nonequilibrium
spin accumulation will exe... | cond-mat_supr-con |
Condensate entanglement and multigap superconductivity in nanoscale
superconductors: A Green functions approach is used to study superconductivity in nanofilms
and nanowires. We show that the superconducting condensate results from the
multimodal entanglement, or internal Josephson coupling, of the subcondensates
ass... | cond-mat_supr-con |
Determining Pair Interactions from Structural Correlations: We examine metastable configurations of a two-dimensional system of
interacting particles on a quenched random potential landscape and ask how the
configurational pair correlation function is related to the particle
interactions and the statistical properties ... | cond-mat_supr-con |
Andreev bound states in rounded corners of d-wave superconductors: Andreev bound states at boundaries of d-wave superconductors are strongly
influenced by the boundary geometry itself. In this work, the zero-energy
spectral weight of the local quasiparticle density of states is presented for
the case of wedge-shaped bo... | 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 |
Anisotropy of the upper critical fields and the paramagnetic Meissner
effect in La1.85Sr0.15CuO4 single Crystals: Optimally-doped La1.85Sr0.15CuO4 single crystals have been investigated by dc
and ac magnetic measurements. These crystals have rectangular needle-like
shapes with the long needle axis parallel to the cry... | cond-mat_supr-con |
Metastability in Josephson transmission lines: Thermal activation and macroscopic quantum tunneling in current-biased
discrete Josephson transmission lines are studied theoretically. The degrees of
freedom under consideration are the phases across the junctions which are
coupled to each other via the inductances of the... | cond-mat_supr-con |
Deterministic Josephson Vortex Ratchet with a load: We investigate experimentally a deterministic underdamped Josephson vortex
ratchet -- a fluxon-particle moving along a Josephson junction in an asymmetric
periodic potential. By applying a sinusoidal driving current one can compel the
vortex to move in a certain direc... | cond-mat_supr-con |
Tunable two-dimensional superconductivity and spin-orbit coupling at the
EuO/KTaO3(110) interface: Unconventional quantum states, most notably the two-dimensional (2D)
superconductivity, have been realized at the interfaces of oxide
heterostructures where they can be effectively tuned by the gate voltage
($V_G$). Her... | cond-mat_supr-con |
Superconducting energy gap and c-axis plasma frequency of
(Nd,Sm)O0.82F0.18FeAs superconductors from infrared ellipsometry: We present ellipsometric measurements of the far-infrared dielectric response
of polycrystalline samples of the new pnictide superconductor RO0.82F0.18FeAs
(R=Nd and Sm). We find evidence that t... | cond-mat_supr-con |
Scaling of the Fano effect of the in-plane Fe-As phonon and the
superconducting critical temperature in Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$: By means of infrared spectroscopy we determine the temperature-doping phase
diagram of the Fano effect for the in-plane Fe-As stretching mode in
Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$.... | cond-mat_supr-con |
Ab initio Study of Cross-Interface Electron-Phonon Couplings in FeSe
Thin Films on SrTiO$_3$ and BaTiO$_3$: We study the electron-phonon coupling strength near the interface of
monolayer and bilayer FeSe thin films on SrTiO$_3$, BaTiO$_3$, and
oxygen-vacant SrTiO$_3$ substrates, using ab initio methods. The calculate... | 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 |
Z$_2$ topology and superconductivity from symmetry lowering of a 3D
Dirac Metal Au$_2$Pb: 3D Dirac semi-metals (DSMs) are materials that have massless Dirac electrons
and exhibit exotic physical properties It has been suggested that structurally
distorting a DSM can create a Topological Insulator (TI), but this has n... | cond-mat_supr-con |
Generation of Teraherz Oscillations by Thin Superconducting Film in
Fluctuation Regime: Explicit analytical expressions for conductivity of a superconducting film
above and below critical temperature in an arbitrary electric field are derived
in the frameworks of the time dependent Ginzburg-Landau theory. It is confi... | cond-mat_supr-con |
High Tc superconductivity in heavy Rare Earth Hydrides: correlation
between the presence of the f states on the Fermi surface, nesting and the
value of Tc: Lanthanum hydrides, containing hydrogen framework structures under
compression, display a superconducting state with a high observed critical
temperature. Howev... | cond-mat_supr-con |
Superconductivity at 15.6 K in Calcium-doped Tb_{1-x}Ca_xFeAsO: the
structure requirement for achieving superconductivity in the hole-doped 1111
phase: Superconductivity at about 15.6 K was achieved in Tb_{1-x}Ca_xFeAsO by
partially substituting Tb^{3+} with Ca^{2+} in the nominal doping region x =
0.40 \sim 0.50. ... | cond-mat_supr-con |
Robust nodal superconductivity induced by isovalent doping in
Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ and BaFe$_2$(As$_{1-x}$P$_x$)$_2$: We present the ultra-low-temperature heat transport study of iron-based
superconductors Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ and
BaFe$_2$(As$_{1-x}$P$_x$)$_2$. For optimally doped
Ba(Fe$_{0.64}$Ru... | cond-mat_supr-con |
How to measure the spatial correlations in disordered
Berezinski-Kosterlitz-Thouless transition ?: The Berezinski-Kosterlitz-Thouless transition is a unique two dimensional
phase transition, separating two phases with exponentially and power-law
decaying correlations, respectively. In disordered systems, these correl... | cond-mat_supr-con |
Percolative nature of the dc paraconductivity in the cuprate
superconductors: We present an investigation of the planar direct-current (dc)
paraconductivity of the model cuprate material HgBa$_2$CuO$_{4+\delta}$ in the
underdoped part of the phase diagram. The simple quadratic
temperature-dependence of the Fermi-liqu... | cond-mat_supr-con |
Double-helix magnetic order in CrAs with Pnma space group: The transition metal pnictide CrAs exhibits superconductivity in the vicinity
of a helimagnetic phase, where it has been found that the propagation vector is
parallel to the c axis and the magnetic moments lie in the ab plane. Here we
use ab initio calculations... | cond-mat_supr-con |
Unusual Hole-doping-dependent Electronic Instability and Electron-Phonon
Coupling in Infinite-layer Nickelates: The interplay between superconductivity and charge density waves (CDWs) under
hole doping in cuprates is one of the central phenomena in condensed matter
physics. Recently, CDWs are also observed in CaCuO$_... | cond-mat_supr-con |
Optical conductivity of iron-based superconductors: The new family of unconventional iron-based superconductors discovered in
2006 immediately relieved their copper-based high-temperature predecessors as
the most actively studied superconducting compounds in the world. The
experimental and theoretical effort made in or... | cond-mat_supr-con |
Paramagnon dispersion and damping in doped
Na$_{x}$Ca$_{2-x}$CuO$_2$Cl$_2$: Using Resonant Inelastic X-ray Scattering, we measure the paramagnon
dispersion and damping of undoped, antiferromagnetic Ca$_2$CuO$_2$Cl$_2$ as
well as doped, superconducting Na$_{x}$Ca$_{2-x}$CuO$_2$Cl$_2$. Our estimation
of the spin-exchan... | cond-mat_supr-con |
Shell Structure and Strengthening of Superconducting Pair Correlation in
Nanoclusters: The existence of shell structure and the accompanying high degeneracy of
electronic levels leads to the possibility of strong superconducting pairing in
metallic nanoclusters with N~100-1000 delocalized electrons. The most favorabl... | cond-mat_supr-con |
Hidden magnetic excitation in the pseudogap phase of a model cuprate
superconductor: The elucidation of the pseudogap phenomenon of the cuprates, a set of
anomalous physical properties below the characteristic temperature T* and above
the superconducting transition temperature Tc, has been a major challenge in
conden... | cond-mat_supr-con |
Microwave Surface Impedance Measurements of the Electronic State and
Dissipation of Magnetic Vortices in Superconducting Iron-Based LiFeAs Single
Crystals: LiFeAs is one of the iron-based superconductors having multiple gaps with the
possible sign reversal. To clarify how those novel natures affect the energy
dissi... | cond-mat_supr-con |
Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting
layered pnictide oxide with a thick perovskite oxide layer: A new layered oxypnictide (Fe2P2)(Sr4Sc2O6) have been synthesized by
solid-state reaction. This material has an alternating layer stacking structure
of anti-fluorite Fe2P2 and perovskite-b... | cond-mat_supr-con |
Direct observation of melting in a 2-D superconducting vortex lattice: Topological defects such as dislocations and disclinations are predicted to
determine the twodimensional (2-D) melting transition. In 2-D superconducting
vortex lattices, macroscopic measurements evidence melting close to the
transition to the norma... | cond-mat_supr-con |
New Series of Nickel-Based Pnictide Oxide Superconductors
(Ni2Pn2)(Sr4Sc2O6) (Pn = P, As): We have discovered new nickel-based pnictide oxide superconductors,
(Ni2Pn2)(Sr4Sc2O6) (Pn = P, As). These compounds have a tetragonal unit cell
with a space group of P4/nmm and they consist of alternate stacking of
anti-fluori... | cond-mat_supr-con |
Pressure-Induced Superconductivity and Its Scaling with Doping-Induced
Superconductivity in the Iron Pnictide with Skutterudite Intermediary Layers: The Ca10(PtnAs8)(Fe2As2)5 (n=3,4) compounds are a new type of iron pnictide
superconductors whose structures consist of stacking Ca-PtnAs8-Ca-Fe2As2 layers
in a unit cel... | cond-mat_supr-con |
Possible Dynamic States in Inductively Coupled Intrinsic Josephson
Junctions of Layered High-$T_c$ Superconductors: Based on computer simulations and theoretical analysis, a new dynamic state
is found in inductively coupled intrinsic Josephson junctions in the absence of
an external magnetic field. In this state, the... | cond-mat_supr-con |
Critical currents in superconductors with quasiperiodic pinning arrays:
One-dimensional chains and two-dimensional Penrose lattices: We study the critical depinning current J_c, as a function of the applied
magnetic flux Phi, for quasiperiodic (QP) pinning arrays, including
one-dimensional (1D) chains and two-dimensi... | 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 |
Temperature and polarization dependence of low-energy magnetic
fluctuations in nearly-optimal-doped NaFe$_{0.9785}$Co$_{0.0215}$As: We use unpolarized and polarized neutron scattering to study the temperature
and polarization dependence of low-energy magnetic fluctuations in
nearly-optimal-doped NaFe$_{0.9785}$Co$_{0... | cond-mat_supr-con |
Elementary vortex pinning potential in a chiral p-wave superconductor: The elementary vortex pinning potential is studied in a chiral p-wave
superconductor with a pairing d=z(k_x + i k_y) on the basis of the
quasiclassical theory of superconductivity. An analytical investigation and
numerical results are presented to s... | cond-mat_supr-con |
The geometric theory of low dimensional superconductivity: The study of the electromagnetic properties of 2D materials is an area of
intensive research. Most of the efforts in the subject have been oriented
towards the understanding and modelling of the microscopic behaviour of the
charge carriers within the medium. Al... | cond-mat_supr-con |
Further detailing of the Bose-Einstein negative-U state in the high
temperature superconducting cuprates: The cause of the sharp and universal optimization of the HTSC condensation
energy at the hole doping concentration of p = 0.19 is identified within the
context of the boson-fermion negative-U modelling and stripe... | cond-mat_supr-con |
Melting of the vortex lattice in high $T_{c}$ superconductors: The precise measurements of vortex melting point towards a need to develop a
quantitative theoretical description of thermal fluctuations in vortex matter.
To tackle the difficult problem of melting, the description of both the solid
and the liquid phase sh... | cond-mat_supr-con |
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