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Possible superconductivity in multi-layer-graphene by application of a
gate voltage: The carrier density in tens of nanometers thick graphite samples
(multi-layer-graphene, MLG) has been modified by applying a gate voltage
($V_g$) perpendicular to the graphene planes. Surface potential microscopy
shows inhomogeneitie... | cond-mat_supr-con |
Magneto-elastic coupling model of deformable anisotropic superconductors: We develop a magneto-elastic (ME) coupling model for the interaction between
the vortex lattice and crystal elasticity. The theory extends the Kogan-Clem's
anisotropic Ginzburg-Landau (GL) model to include the elasticity effect. The
anisotropies ... | cond-mat_supr-con |
Temperature Dependence of Superconducting Gaps in Mg(Al)B2 System
Investigated by SnS-Andreev Spectroscopy: Detailed temperature dependence of both superconducting gaps was obtained
directly by means of SnS-Andreev spectroscopy. The \Delta \sigma,\pi(T) -curves
were shown to be deviated from standard BCS-like behavio... | cond-mat_supr-con |
Insulating regime of an underdamped current-biased Josephson junction
supporting $\mathbb{Z}_3$ and $\mathbb{Z}_4$ parafermions: We study analytically a current-biased topological Josephson junction
supporting $\mathbb{Z}_n$ parafermions. First, we show that in an infinite-size
system a pair of parafermions on the ju... | cond-mat_supr-con |
Evidence for field-induced excitations in low-temperature thermal
conductivity of Bi_2Sr_2CaCu_2O_8: The thermal conductivity ,$\kappa$, of Bi_2Sr_2CaCu_2O_8 was studied as a
function of magnetic field. Above 5 K, after an initial decrease, $\kappa(H)$
presents a kink followed by a plateau, as recently reported by Kr... | cond-mat_supr-con |
Quantum phase transitions in two-dimensional superconductors: a review
on recent experimental progress: Superconductor-insulator/metal transition (SIT/SMT) as a paradigm of quantum
phase transition has been a research highlight over the last three decades.
Benefit from recent developments in the fabrication and measu... | cond-mat_supr-con |
Magnetic field dependence of pairing interaction in ferromagnetic
superconductors with triplet pairing: It is developed a microscopic description of superconductivity in
ferromagnetic materials with triplet pairing triggered by the exchange of
magnetic fluctuations. Instead widely used paramagnon model we work with
p... | cond-mat_supr-con |
The Microstrain-Doping Phase Diagram of the Iron Pnictides
Heterostructures at Atomic Limit: The 3D phase diagram of iron pnictides where the critical temperature depends
on charge density and microstrain in the active FeAs layers is proposed. The
iron pnictides superconductors are shown to be a practical realization... | cond-mat_supr-con |
The pseudogap and doping dependent magnetic properties of
La2-xSrxCu1-yZnyO4: The effects of planar hole content, p (= x), on the static magnetic
susceptibility, chi(T), of polycrystalline La2-xSrxCu1-yZnyO4 compounds were
investigated over a wide range of Sr (x) and Zn (y) contents. The magnetic
behavior caused by Z... | cond-mat_supr-con |
Minimal timing jitter in superconducting nanowire single photon
detectors: Using two-temperature model coupled with modified time-dependent
Ginzburg-Landau equation we calculate the delay time $\tau_d$ in appearance of
growing normal domain in the current-biased superconducting strip after
absorption of the single ph... | cond-mat_supr-con |
Quasiparticle spectrum near the gap node directions in the mixed state
of d-wave superconductors: We report on a calculation of the quantized energy spectrum and quasiparticle
eigenfunctions for low lying excitations in the mixed state of clean d-wave
superconductors. Our study is based on an approximate analytical s... | cond-mat_supr-con |
Nickelate superconductors: an ongoing dialog between theory and
experiments: After decades of fundamental research, unconventional superconductivity has
recently been demonstrated in rare-earth infinite-layer nickelates. The current
view depicts these systems as a new category of superconducting materials, as
they ap... | cond-mat_supr-con |
Theory of the Transition at 0.2 K in Ni-doped Bi2Sr2CaCu2O8: A theory is put forward that the electronic phase transition at 0.2 K in
Ni-doped Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$ is result of the formation of a spin
density wave in the system of Ni impurities. The driving force for the
transition is the exchange interact... | cond-mat_supr-con |
Topological Phase Transition in Superconductors with Mirror Symmetry: We provide analytical and numerical evidence that the attractive
two-dimensional Kitaev model on a lattice with mirror symmetry demonstrates
unusual 'intrinsic' phase at half filling. This phase emerges in the phase
diagram at the boundary separating... | cond-mat_supr-con |
Pseudogap phase of cuprate superconductors confined by Fermi surface
topology: The properties of cuprate high-temperature superconductors are largely shaped
by competing phases whose nature is often a mystery. Chiefly among them is the
pseudogap phase, which sets in at a doping $p^*$ that is material-dependent.
What ... | cond-mat_supr-con |
Enhanced low-energy magnetic excitations evidencing the Cu-induced
localization in an Fe-based superconductor Fe$_{0.98}$Te$_{0.5}$Se$_{0.5}$: We have performed inelastic neutron scattering measurements on
optimally-doped Fe$_{0.98}$Te$_{0.5}$Se$_{0.5}$ and 10% Cu-doped
Fe$_{0.88}$Cu$_{0.1}$Te$_{0.5}$Se$_{0.5}$ to in... | cond-mat_supr-con |
Calculation of Leggett-Takagi relaxation in vortices of superfluid 3He-B: We calculate the relaxation of Brinkman-Smith mode via Leggett-Takagi
relaxation in the presence of an isolated vortex in superfluid 3He-B. The
calculation is based on an analytical solution of the order parameter far from
the vortex axis. We obt... | cond-mat_supr-con |
Structure and Magnetization of Two-Dimensional Vortex Arrays in the
Presence of Periodic Pinning: Ground-state properties of a two-dimensional system of superconducting
vortices in the presence of a periodic array of strong pinning centers are
studied analytically and numerically. The ground states of the vortex syst... | cond-mat_supr-con |
Transport properties of the new Fe-based superconductor KxFe2Se2 (Tc =
33 K): We synthesized the new Fe-based superconductor K0.8Fe2Se2 single crystals.
The obtained single crystal exhibited a sharp superconducting transition, and
the onset and zero-resistivity temperature was estimated to be 33 and 31.8 K,
respectiv... | cond-mat_supr-con |
The crystal structure of FeSe0.44Te0.56: The crystal structure of the superconductor FeSe0.44Te0.56 was redetermined
by high-resolution X-ray single crystal diffraction at 173 K (anti-PbO-type,
P4/nmm, a=3.7996(2), c=5.9895(6) A, R1=0.022, wR2=0.041, 173 F^2).
Significantly different z-coordinates of tellurium and sele... | cond-mat_supr-con |
Hydrogen-induced high-temperature superconductivity in two-dimensional
materials: Example of hydrogenated monolayer MgB$_2$: Hydrogen-based compounds under ultra-high pressure, such as the polyhydrides
H$_3$S and LaH$_{10}$, superconduct through the conventional electron-phonon
coupling mechanism to attain the record... | cond-mat_supr-con |
Charge-density wave transition in magnetic topological semimetal
EuAl$_4$: The interplay among topology, charge-density wave (CDW), and magnetism can
give rise to a plethora of exotic quantum phenomena. Recently, a group of
magnetic topological semimetals with tetragonal lattices and CDW order were
found to exhibit a... | cond-mat_supr-con |
Superconductivity in undoped CaFe2As2 single crystals: Single crystals of undoped CaFe2As2 were grown by a FeAs self-flux method,
and the crystals were quenched in ice-water rapidly after high temperature
growth. The quenched crystal undergoes a collapsed tetragonal structural phase
transition around 80 K revealed by t... | cond-mat_supr-con |
Unveiling Mechanisms of Electric Field Effects on Superconductors by
Magnetic Field Response: We demonstrate that superconducting aluminium nano-bridges can be driven into
a state with complete suppression of the critical supercurrent via
electrostatic gating. Probing both in- and out-of-plane magnetic field
response... | cond-mat_supr-con |
Theory of superconductivity due to Ngai's mechanism in lightly doped
SrTiO3: We develop a theory of superconducting pairing in low-density Strontium
titanate due to quadratic coupling of electron density to soft transverse
optical phonons. It leads to static attractive potential between electrons
which decay length s... | cond-mat_supr-con |
Macroscopic character of composite high temperature superconducting
wires: The "d-wave" symmetry of the superconducting order in the cuprate high
temperature superconductors is a well established fact, and one which
identifies them as "unconventional." However, in macroscopic contexts --
including many potential appl... | cond-mat_supr-con |
Two energy scales and close relationship between the pseudogap and
superconductivity in underdoped cuprate superconductors: By measuring the low temperature specific heat, the low energy quasi-particle
excitation has been derived and analyzed in systematically doped
La$_{2-x}$Sr$_{x}$CuO$_{4}$ single crystals. The Vo... | cond-mat_supr-con |
Synthesis and superconductivity of new BiS2 based superconductor
PrO0.5F0.5BiS2: We report synthesis and superconductivity at 3.7K in PrO0.5F0.5BiS2. The
newly discovered material belongs to the layered sulfide based REO0.5F0.5BiS2
compounds having ZrCuSiAs type structure. The bulk polycrystalline compound is
synthes... | cond-mat_supr-con |
Parity effect in a small superconducting grain: A rigorous result: The parity effect in an ultra-small superconducting grain is examined. By
applying a generalized version of Lieb's spin-reflection positivity technique,
we show rigorously that the parity parameter $\Delta_P$ is nonvanishing in such
a system. A positive... | cond-mat_supr-con |
Magnetic characterization of sintered MgB2 samples: effect of the
substitution or doping with Li, Al and Si: Powdered and sintered MgB2 samples have been characterized through magnetic
measurements performed from T = 5 K up to few degrees above the transition
temperature of about 39 K. We found that the sintered samp... | cond-mat_supr-con |
What does the Josephson effect tell us about the superconducting state
of the cuprates?: We review the recent measurements of the current-phase relation in cuprate
Josephson junctions. Special attention is paid to 45 degree grain boundary
junctions and to c-axis junctions between YBCO and Nb. It is shown that the
ano... | cond-mat_supr-con |
High Temperature Superconductivity: the explanation: Soon after the discovery of the first high temperature superconductor by
Georg Bednorz and Alex Mueller in 1986 the late Sir Nevill Mott answering his
own question "Is there an explanation?" [Nature v 327 (1987) 185] expressed a
view that the Bose-Einstein condensati... | cond-mat_supr-con |
Phenomenological study of spin-triplet ferromagnetic superconductors: Unconventional superconductivity with spin-triplet Cooper pairing is reviewed
on the basis of the quasi-phenomenological Ginzburg-Landau theory. The
superconductivity, in particular, the mixed phase of coexistence of
ferromagnetism and unconventional... | cond-mat_supr-con |
On the Experimental Evidence for Possible Superconductivity in LK99: The desire to create an energy efficient world is bound to be incomplete
without the discovery of a room temperature superconductor at ambient pressure.
A recent report on the room-temperature ambient-pressure superconductor has
inspired scientists to... | cond-mat_supr-con |
ARPES kink is a "smoking gun" for the theory of high-Tc superconductors:
dominance of the electron-phonon interaction with forward scattering peak: The ARPES spectra in high-Tc superconductors show four distinctive features
in the quasiparticle self-energy. All of them can be explained consistently by
the theory in w... | cond-mat_supr-con |
Psuedo-isotropic upper critical field in cobalt-doped SrFe2As2 epitaxial
films: The temperature and angular dependence of the upper critical field (Hc2) is
reported for cobalt-doped SrFe2As2 epitaxial films between Tc and 0.5 K in
pulsed magnetic fields up to 50 T. For H parallel c, Hc2 is close to a linear
function ... | cond-mat_supr-con |
Proximity Eliashberg theory of electrostatic field-effect-doping in
superconducting films: We calculate the effect of a static electric field on the critical
temperature of a s-wave one band superconductor in the framework of proximity
effect Eliashberg theory. In the weak electrostatic field limit the theory has
no ... | cond-mat_supr-con |
Nernst effect of the new iron-based superconductor
LaO$_{1-x}$F$_{x}$FeAs: We report the first Nernst effect measurement on the new iron-based
superconductor LaO$_{1-x}$F$_{x}$FeAs $(x=0.1)$. In the normal state, the
Nernst signal is negative and very small. Below $T_{c}$ a large positive peak
caused by vortex motion... | cond-mat_supr-con |
Transport evidence for the surface state and spin-phonon interaction in
FeTe$_{0.5}$Se$_{0.5}$: The iron chalcogenides have been proved to be intrinsic topological
superconductors to implement quantum computation because of their unique
electronic structures. The topologically nontrivial surface states of
FeTe$_{0.5}... | cond-mat_supr-con |
Screening magnetic fields by a superconducting disk: a simple model: We introduce a simple approach to evaluate the magnetic field distribution
around superconducting samples, based on the London equations; the elementary
variable is the vector potential. This procedure has no adjustable parameters,
only the sample geo... | cond-mat_supr-con |
AC Loss in Striped (Filamentary) YBCO Coated Conductors Leading to
Designs for High Frequencies and Field-Sweep Amplitudes: AC losses of YBCO coated conductors are investigated by calculation and
experiment for the higher frequency regime. Previous research using YBCO film
deposited onto single crystal substrates dem... | cond-mat_supr-con |
Non-equilibrium phenomena in superconductors probed by femtosecond
time-domain spectroscopy: Development of ultrafast lasers and non-linear optical techniques over the
last two decades provides tools to access real-time dynamics of low energy
excitations in superconductors. For example, time-resolved THz spectroscopy... | cond-mat_supr-con |
Carbon substitution effect in MgB$_2$: We investigated carbon substitution effect on boron plane of superconducting
MgB$_2$. MgB$_2$ and MgB$_{1.8}$C$_{0.2}$ samples are synthesized under high
pressure furnace. MgB$_{1.8}$C$_{0.2}$ are characterized as AlB$_2$-type single
phase with smaller B-B distance. During the sup... | cond-mat_supr-con |
Why an ac magnetic field shifts the irreversibility line in type-II
superconductors: We show that for a thin superconducting strip placed in a transverse dc
magnetic field - the typical geometry of experiments with high-Tc
superconductors - the application of a weak ac magnetic field perpendicular to
the dc field gen... | cond-mat_supr-con |
Reply to "Comment on Yerin et al., Phys. Rev. Lett. 121, 077002 (2018),
and Mironov et al., Phys. Rev. Lett. 109, 237002 (2012)" by A. F. Volkov, F.
S. Bergeret, and K. B. Efetov: Here we reply to the comment by A. F. Volkov, F. S. Bergeret, and K. B.
Efetov. | cond-mat_supr-con |
Lithium Beryllium Phosphide (LiBeP): A possible MgB2-like Superconductor: The search for materials similar to magnesium diboride, MgB2, based on
structure and electronic similarity did not produce close enough
superconductors in terms of Tc. Changing the search to iso-electronic and
iso-atomic number equivalents opened... | cond-mat_supr-con |
Electronic Phase Separation Transition as the Origin of the
Superconductivity and the Pseudogap Phase of Cuprates: We propose a new phase of matter, an electronic phase separation transition
that starts near the upper pseudogap and segregates the holes into high and low
density domains. The Cahn-Hilliard approach is ... | cond-mat_supr-con |
Electronic band structure and chemical bonding in the novel
antiperovskite ZnCNi3 as compared with 8-K superconductor MgCNi3: Energy band structure of the discovered ternary perovskite-like compound
ZnCNi3 reported by Park et al (2004) as a non-superconducting paramagnetic
metal was investigated using the FLMTO-GGA m... | cond-mat_supr-con |
Superconductivity in $β$-pyrochlore superconductor KOs$_{2}$O$_{6}$:
treatment within strong-coupling Eliashberg theory: We study the influence of the rattling phonons on superconductivity in
$\beta$-pyrochlore KOs$_{2}$O$_{6}$ compound based on the strong-coupling
Eliashberg approach. In particular, analyzing the sp... | cond-mat_supr-con |
KFe_2Se_2 is the parent compound of K-doped iron selenide
superconductors: We elucidate the existing controversies in the newly discovered K-doped iron
selenide (KxFe2-ySe2-z) superconductors. The stoichiometric KFe2Se2 with
\surd2\times\surd2 charge ordering was identified as the parent compound of
KxFe2-ySe2-z supe... | cond-mat_supr-con |
The Gradient Expansion for the Free-Energy of a Clean Superconductor: We describe a novel method for obtaining the gradient expansion for the free
energy of a clean BCS superconductor. We present explicit results up to fourth
order in the gradients of the order parameter. | cond-mat_supr-con |
Zurek-Kibble domain structures: The Dynamics of Spontaneous Vortex
formation in Annular Josephson Tunnel Junctions: Phase transitions executed in a finite time show a domain structure with
defects, that has been argued by Zurek and Kibble to depend in a characteristic
way on the quench rate. In this letter we present... | cond-mat_supr-con |
Superconductivity of the New Medium-Entropy Alloy V4Ti2W with a
Body-Centered Cubic Structure: Medium- and high-entropy alloy (MEA and HEA) superconductors have attracted
considerable interest since their discovery. This paper reports the
superconducting properties of ternary tungsten-containing MEA V4Ti2W for the
fi... | cond-mat_supr-con |
Elliptical vortex and oblique vortex lattice in the FeSe superconductor
based on the nematicity and mixed superconducting orders: The electronic nematic phase is characterized as an ordered state of matter
with rotational symmetry breaking, and has been well studied in the quantum
Hall system and the high-$T_c$ super... | cond-mat_supr-con |
New Superconductivity Dome in LaFeAsO$_{1-x}$F$_{x}$ Accompanied by
Structural Transition: High temperature superconductivity is often found in the vicinity of
antiferromagnetism. This is also true in LaFeAsO$_{1-x}$F$_{x}$ ($x \leq$ 0.2)
and many other iron-based superconductors, which leads to proposals that
superc... | cond-mat_supr-con |
Two-dimensional magnetism in the pnictide superconductor parent material
SrFeAsF probed by muon-spin relaxation: We report muon-spin relaxation measurements on SrFeAsF, which is the parent
compound of a newly discovered iron-arsenic-fluoride based series of
superconducting materials. We find that this material has ve... | cond-mat_supr-con |
Flux Pinning by Nano Particles Embedded in Polycrystalline Y-123
Superconductors: Bulk superconductor samples of YBa2Cu3-xZnxO7-{\delta} with x = 0, 0.01, 0.03
are synthesized by solid-state reaction route. The structural characterisation
of all samples has been carried out by x-ray-diffraction (XRD) and transmission... | cond-mat_supr-con |
Microwave transmissions through superconducting coplanar waveguide
resonators with different coupling configurations: We design and fabricate two types of superconducting niobium coplanar
waveguide microwave resonators with different coupling capacitors on high
purity Si substrates. Their microwave transmissions are ... | cond-mat_supr-con |
Chemically gated electronic structure of a superconducting doped
topological insulator system: Angle resolved photoemission spectroscopy is used to observe changes in the
electronic structure of bulk-doped topological insulator Cu$_x$Bi$_2$Se$_3$ as
additional copper atoms are deposited onto the cleaved crystal surfa... | cond-mat_supr-con |
Vortex dynamics in two-dimensional Josephson junction arrays: The dynamic response of unfrustrated two-dimensional Josephson junction
arrays close to, but above the Kosterlitz-Thouless($KT$) transition temperature
is described in terms of the vortex dielectric function $\epsilon(\omega)$. The
latter is calculated by co... | cond-mat_supr-con |
Impurity-induced quasiparticle interference in the parent compounds of
iron-pnictide superconductors: The impurity-induced quasiparticle interference(QPI) in the parent compounds
of iron-pnictide superconductors is investigated based on a phenomenological
two-orbital four-band model and T-matrix method. We find the Q... | cond-mat_supr-con |
Neutron Scattering Studies of spin excitations in hole-doped
Ba0.67K0.33Fe2As2 superconductor: We report inelastic neutron scattering experiments on single crystals of
superconducting Ba0.67K0.33Fe2As2 (Tc = 38 K). In addition to confirming the
resonance previously found in powder samples, we find that spin excitatio... | cond-mat_supr-con |
Scanning tunnelling spectroscopy of the vortex state in NbSe2 using a
superconducting tip: The vortex electronic structure in the multiband superconductor NbSe2 is
studied by means of Scanning Tunneling Spectroscopy (STS) using a
superconducting tip. The use of a superconducting tip (Pb) as a probe provides
an enhanc... | cond-mat_supr-con |
Superconductivity without inversion and time-reversal symmetries: The traditional symmetries that protect superconductivity are time-reversal
and inversion. Here, we examine the minimal symmetries protecting
superconductivity in two dimensions and find that time-reversal symmetry and
inversion symmetry are not required... | cond-mat_supr-con |
Effect of metal vacancies on the electronic band structure of hexagonal
Nb, Zr and Y diborides: Energy band structures of metal-deficient hexagonal diborides M$_{0.75}$B$_2$
(M = Nb, Zr and Y) were calculated using the full-potential LMTO method. The
metal vacancies change the density of states near the Fermi level a... | cond-mat_supr-con |
Trilayer multi-orbital models of $\mathrm{La_{4}Ni_{3}O_{10}}$: Recently, the discovery of superconductivity in Ruddlesden-Popper (RP)
$\mathrm{La_4Ni_3O_{10}}$ under pressure has further expanded the realm of
nickelate-based superconductor family. In this paper, we performed a
first-principle study of $\mathrm{La_4Ni_... | cond-mat_supr-con |
Route to Observable Fulde-Ferrell-Larkin-Ovchinnikov Phases in 3D
Spin-Orbit Coupled Degenerate Fermi Gases: The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase was first predicted in 2D
superconductors about 50 years ago, but so far unambiguous experimental
evidences are still lacked. The recently experimentally reali... | cond-mat_supr-con |
Pseudogap-like phase in Ca(Fe$_{1-x}$Co$_x$)$_2$As$_2$ revealed by
$^{75}$As NQR: We report $^{75}$As NQR measurements on single crystalline
Ca(Fe$_{1-x}$Co$_x$)$_2$As$_2$ ($0\leq x \leq 0.09$). The nuclear spin-lattice
relaxation rate $T_1^{-1}$ as a function of temperature $T$ and Co dopant
concentration $x$ reveal... | cond-mat_supr-con |
Enhancement of functional properties of V$_{0.6}$Ti$_{0.4}$ alloy
superconductor by the addition of yttrium: We show here that the yttrium is immiscible and precipitates with various
sizes in the body centred cubic V$_{0.6}$Ti$_{0.4}$ alloy superconductor. The
number and size of the precipitates are found to depend o... | cond-mat_supr-con |
High-$T$$_\textrm{C}$ Superconductivity in Hydrogen Clathrates Mediated
by Coulomb Interactions between Hydrogen and Central-Atom Electrons: The uniquely characteristic macrostructures of binary hydrogen-clathrate
compounds $M$H$_\textrm{n}$ formed at high pressure, a cage of hydrogens
surrounding a central-atom host... | cond-mat_supr-con |
Optimal interlayer hopping and high temperature Bose-Einstein
condensation of local pairs in quasi 2D superconductors: Both FeSe and cuprate superconductors are quasi 2D materials with high
transition temperatures and local fermion pairs. Motivated by such systems, we
investigate real space pairing of fermions in an ... | cond-mat_supr-con |
Reversible transitions in high-$T_c$ cuprates based point contacts: The influence of electric felds and currents has been investigated in the
high-$T_c$ superconductors $YBaCuO$ and $BiSrCaCuO$ using a point-contact
geometry with $Ag$ as the counterelectrode, which reveal switching transitions
between states of a diffe... | 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 |
Cold atoms near superconductors: Atomic spin coherence beyond the
Johnson noise limit: We report on the measurement of atomic spin coherence near the surface of a
superconducting niobium wire. As compared to normal conducting metal surfaces,
the atomic spin coherence is maintained for time periods beyond the Johnson
... | cond-mat_supr-con |
Majorana-assisted nonlocal electron transport through a floating
topological superconductor: The nonlocal nature of the fermionic mode spanned by a pair of Majorana bound
states in a one-dimensional topological superconductor has inspired many
proposals aiming at demonstrating this property in transport. In particula... | cond-mat_supr-con |
Single crystal growth and optical conductivity of SrPt$_2$As$_2$
superconductors: SrPt$_2$As$_2$ single crystals with CaBe$_2$Ge$_2$-type structure were
synthesized by self-melting technique. X-ray diffraction, transmission electron
microscopy, electrical resistivity, specific heat and optical spectroscopy
measuremen... | cond-mat_supr-con |
S-shaped suppression of the superconducting transition temperature in
Cu-intercalated NbSe2: 2H-NbSe2 is the prototype and most frequently studied of the well-known
transition metal dichalcogenide (TMDC) superconductors. Widely acknowledged to
be a conventional superconductor, its transition temperature to the
superc... | cond-mat_supr-con |
Superconductivity and topological behavior in gallenene: Among the large variety of two-dimensional (2D) materials discovered to date,
elemental monolayers that host superconductivity are very rare. Using ab initio
calculations we show that recently synthesized gallium monolayers, coined
gallenene, are intrinsically su... | cond-mat_supr-con |
Superconductivity at 4K in Pd deficient layered Ta_2Pd_xS_6: Here in this short note, we report on the low dimensional 4d and 5d
transition metals-chalcogenide based compounds i.e., Ta2PdxS6, showing
semiconducting to superconducting transition around 4K with upper critical
field outside Pauli paramagnetic limit. It se... | cond-mat_supr-con |
A-15 type superconducting hydride $La_4H_{23}$: Nanograined structure
with low strain, strong electron-phonon interaction, and moderate level of
nonadiabaticity: For seven decades by A-15 superconductors we meant metallic $A_3B$ alloys
(where A is a transition metal, and B is groups IIIB and IVB element)
discovered... | cond-mat_supr-con |
Doping dependence of the coupling of electrons to bosonic modes in the
single-layer high-temperature Bi2Sr2CuO6 superconductor: A recent highlight in the study of high-Tc superconductors is the observation
of band renormalization / self-energy effects on the quasiparticles. This is
seen in the form of kinks in the qu... | cond-mat_supr-con |
Tuning the static spin-stripe phase and superconductivity in
La_(2-x)Ba_xCuO_4 (x = 1/8) by hydrostatic pressure: Magnetization and muon spin rotation experiments were performed in
La_(2-x)Ba_xCuO_4 (x = 1/8) as a function of hydrostatic pressure up to p = 2.2
GPa. It was found that the magnetic volume fraction of th... | cond-mat_supr-con |
Strong charge fluctuations manifested in the high-temperature Hall
coefficient of high-T_c cuprates: By measuring the Hall coefficient R_H up to 1000 K in La_2CuO_4,
Pr_{1.3}La_{0.7}CuO_4, and La_{2-x}Sr_xCuO_4 (LSCO), we found that the
temperature (T) dependence of R_H in LSCO for x = 0 - 0.05 at high temperature
un... | cond-mat_supr-con |
Number theory, periodic orbits and superconductivity in nano-cubes: We study superconductivity in isolated superconducting nano-cubes and
nano-squares of size $L$ in the limit of negligible disorder, $\delta/\Delta_0
\ll 1$ and $k_F L \gg 1$ for which mean-field theory and semiclassical
techniques are applicable, with ... | cond-mat_supr-con |
Probing itinerant antiferromagnetism with $d$-wave Andreev reflection
spectroscopy: To study how Andreev reflection (AR) is affected by itinerant
antiferromagnetism, we perform $d$-wave AR spectroscopy with superconducting
YBa$_2$Cu$_3$O$_{7-\delta}$ on TiAu and on variously-oxidized Nb (NbO$_x$)
samples. X-ray photo... | cond-mat_supr-con |
Reentrant AC magnetic susceptibility in Josephson-junction arrays: An
alternative explanation for the paramagnetic Meissner effect: The paramagnetic Meissner effect (PME) measured in high $T_{C}$ granular
superconductors has been attributed to the presence of $\pi$-junctions between
the grains. Here we present measur... | cond-mat_supr-con |
Suppression of superconductivity by Neel-type magnetic fluctuations in
the iron pnictides: Motivated by recent experimental detection of Neel-type ($(\pi,\pi)$)
magnetic fluctuations in some iron pnictides, we study the impact of competing
$(\pi,\pi)$ and $(\pi,0)$ spin fluctuations on the superconductivity of these
... | cond-mat_supr-con |
Strong electron-lattice coupling and orbital fluctuations in iron
pnictide superconductor Ba(Fe1-xCox)2As2: This paper has been withdrawn by the author due to some experimental
mistakes. In this paper, we reported that C66, C44 and (C11-C12)/2 show
remarkable softening toward the structural transition temperature TS.... | cond-mat_supr-con |
Comparison of the fluctuation influence on the resistive properties of
the mixed state of BiSrCaCuO and of thin films of conventional superconductor: The resistive properties of layered HTSC BiSrCaCuO in the mixed state are
compared with those of thin films of conventional superconductors with weak
disorders (amorpho... | cond-mat_supr-con |
Magnetic field induced polarization effects in intrinsically granular
superconductors: Based on the previously suggested model of nanoscale dislocations induced
Josephson junctions and their arrays, we study the magnetic field induced
electric polarization effects in intrinsically granular superconductors. In
additio... | cond-mat_supr-con |
Justification of the canonical quantization of the Josephson effect: Quantum devices based on Josephson effect in superconductors are usually
described by a Hamiltonian obtained by commonly used canonical quantization.
However, this recipe has not been yet rigorously justified. We show that this
approach is indeed corr... | cond-mat_supr-con |
Geometrical Probability Distribution Functions for Cable-in-Conduit
Conductors with Simply and Multiply Connected Cross-Sections: A geometrical method is presented for the calculation of the strand
distribution functions for cable-in-conduit superconductors with simple and
multiply connected cross-sections. The metho... | cond-mat_supr-con |
Clocking the Onset of Bilayer Coherence in a High-$\mathrm{T_C}$ Cuprate: In cuprates, a precursor state of superconductivity is speculated to exist
above the critical temperature $\mathrm{T_C}$. Here we show via a combination
of far-infrared ellipsometry and ultrafast broadband optical spectroscopy that
signatures of ... | cond-mat_supr-con |
A first principles study on FeAs single layers: FeAs- single layer is tested as a simple model for LaFeAsO and BaFe2As2 based
on first-principles calculations using generalized gradient approximation (GGA)
and GGA+U. The calculated single- layer geometric and electronic structures are
inconsistent with that of bulk mat... | cond-mat_supr-con |
Roles of Antiferromagnetic Fluctuation in High Field Phase Diagram of
Superconductors with Strong Paramagnetic Depairing: The high field phase diagram and magnetic properties of CeCoIn_5 below
H_c2(0) are examined from the picture regarding the high field and low
temperature (HFLT) phase as a possible Fulde-Ferrell-L... | cond-mat_supr-con |
Where are holes in Y_{1-x}Pr_xBa2Cu3O7 ?: Recent experiments by Mertz et al (Phys. Rev. B55, 9160, 1997) demonstrated
that the loss of superconductivity upon Pr doping is associated with the change
of the character of the oxygen holes from $p_{\sigma}$ to $p_{\pi}.$ This
experiment sheds new light onto the long-standin... | cond-mat_supr-con |
Orientation-dependent Josephson effect in spin-singlet
superconductor/altermagnet/spin-triplet superconductor junctions: We study the Josephson effect in the spin-singlet
superconductor/altermagnet/spin-triplet superconductor junctions using the
Green's function method. The current-phase difference relationships in t... | cond-mat_supr-con |
On the coupling of magnetic moments to superconducting quantum
interference devices: We investigate the coupling factor $\phi_\mu$ that quantifies the magnetic
flux $\Phi$ per magnetic moment $\mu$ of a point-like magnetic dipole that
couples to a superconducting quantum interference device (SQUID). Representing
the ... | cond-mat_supr-con |
Conventional mechanisms for "exotic" superconductivity: We consider the pairing state due to the usual BCS mechanism in substances of
cubic and hexagonal symmetry where the Fermi surface forms pockets around
several points of high symmetry. We find that the symmetry imposed on the
multiple pocket positions could give r... | cond-mat_supr-con |
Anisotropic Superconductivity in the Induced Pairing Model: The model of local electron pairs and itinerant fermions coupled via charge
exchange mechanism, which mutually induces superconductivity in both subsystems
is studied for anisotropic pairing symmetry. The phase diagram is presented and
the phase fluctuations e... | cond-mat_supr-con |
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