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Triplet superconductivity and spin density wave in biased AB bilayer graphene: We examine spin density wave and triplet superconductivity as possible ground states of the Bernal bilayer graphene. The spin density wave is stable for the unbiased and undoped bilayer. Both the doping and the applied bias voltage destroy...	cond-mat_supr-con
Interpretation of Inelastic Neutron Scattering Data Using the Phase Diagram of Hole-Doped Cuprates: Inelastic Neutron Scattering (INS) data in LSCO, YBCO and Bi2212 are discussed. In the literature, the INS spectra remain far from being comprehensively understood. We show that local (Q-integrated) susceptibility data...	cond-mat_supr-con
Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs: The recently discovered quaternary arsenide oxide superconductor La[O1-xFx]FeAs with the superconducting critical transition temperature (Tc) of 26 K [1], has been quickly expanded to another high-Tc superconducting system beyond copp...	cond-mat_supr-con
Spectroscopy of electron-phonon interaction of superconducting point contacts: experimental aspects: The recovering procedure of the electron-phonon interaction (EPI) functions from the additional nonlinearities of the current-voltage curve ($I-V$ curve) of point contacts associated with an excess current is consider...	cond-mat_supr-con
Muon-Spin Rotation Spectra in the Mixed Phase of High-T_c Superconductors : Thermal Fluctuations and Disorder Effects: We study muon-spin rotation (muSR) spectra in the mixed phase of highly anisotropic layered superconductors, specifically Bi_2+xSr_2-xCaCu_2O_8+delta (BSCCO), by modeling the fluid and solid phases o...	cond-mat_supr-con
Tunable mechanically-induced hysteresis in suspended Josephson junctions: The coupling of superconducting systems to mechanical resonators is an emerging field, with wide reaching implications including high precision sensing and metrology. Experimental signatures of this coupling have so far been small, seldom and oft...	cond-mat_supr-con
Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs: We use neutron scattering to study vanadium (hole)-doped LiFe$_{1-x}$V$_x$As. In the undoped state, LiFeAs exhibits superconductivity at $T_c=18$ K and transverse incommensurate spin excitations similar to electron overdoped iron pnictides. Up...	cond-mat_supr-con
Crossover of the high-energy spin fluctuations from collective triplons to localized magnetic excitations in doped Sr14-xCaxCu24O41 cuprate ladders: We studied the magnetic excitations in the quasi-one-dimensional (q-1D) ladder subsystem of Sr_(14-x) Ca_x Cu_24 O_41(SCCO) using Cu L_3-edge resonant inelastic X-ray sc...	cond-mat_supr-con
MgB2 single crystals: high pressure growth and anisotropic properties: Single crystals of MgB2 with a size up to 1.5x0.9x0.2 mm3 have been grown with a high pressure cubic anvil technique. The crystal growth process is very peculiar and involves an intermediate nitride, namely MgNB9. Single crystals of BN and MgB2 grow...	cond-mat_supr-con
Multi-Dimensional Coherent Spectroscopy of Light-Driven States and their Collective Modes in Multi-Band Superconductors: We present a comprehensive theory of light-controlled multi-band superconductivity and apply it to predict distinctive signatures of light-driven superconducting (SC) states in terahertz multi-dime...	cond-mat_supr-con
Electron-phonon superconductivity in $A$Pt$_3$P compounds: from weak to strong coupling: We study the newly discovered Pt phosphides $A$Pt$_3$P ($A$=Sr, Ca, La) [ T. Takayama et al. Phys. Rev. Lett. 108, 237001 (2012)] using first-principles calculations and Migdal-Eliashberg theory. Given the remarkable agreement wi...	cond-mat_supr-con
Giant anisotropic magnetoresistance in Ising superconductor-magnetic insulator tunnel junctions: Superconductivity and magnetism are generally incompatible because of the opposing requirement on electron spin alignment. When combined, they produce a multitude of fascinating phenomena, including unconventional superco...	cond-mat_supr-con
Properties of a diagonal 2-orbital ladder model of the Fe-pnictide superconductors: We study a diagonal 2-orbital ladder model of the Fe based superconductors using the density matrix renormalization group method. At half filling, we find a close competition between a "spin-striped" state and a non-collinear "spin-ch...	cond-mat_supr-con
Shaping graphene superconductivity with nanometer precision: Graphene holds great potential for superconductivity due to its pure two-dimensional nature, the ability to tune its carrier density through electrostatic gating, and its unique, relativistic-like electronic properties. At present, we are still far from contr...	cond-mat_supr-con
Percolative nature of the transition from 60 K to 90 K phase in YBa2Cu3O6+d: We have measured the heat capacity of YBa2Cu3O6+d for 0.7<d<0.8 between 1.8 and 300K. It was found that doping dependences of specific heat jump and temperature of heat capacity jump contradict to the assumption of spatially homogeneous elec...	cond-mat_supr-con
Spin Fluctuation-Induced Superconductivity in κ-BEDT-TTF Compounds: Spin fluctuation-induced superconductivity in quasi-two dimensional organic compounds, \kappa-BEDT-TTF salts, is investigated within a fluctuation exchange (FLEX) approximation using a half-filled Hubbard model with a right-angled isosceles triangular ...	cond-mat_supr-con
Controlling the superconducting transition by spin-orbit coupling: Whereas there exists considerable evidence for the conversion of singlet Cooper pairs into triplet Cooper pairs in the presence of inhomogeneous magnetic fields, recent theoretical proposals have suggested an alternative way to exert control over triple...	cond-mat_supr-con
Superconducting density of states and bandstructure at the surface of the candidate topological superconductor Au2Pb: The electronic bandstructure of Au$_2$Pb has a Dirac cone which gaps when undergoing a structural transition into a low temperature superconducting phase. This suggests that the superconducting phase ...	cond-mat_supr-con
Dynamic Phase Transitions in Superconductivity: In this Letter, the dynamic phase transitions of the time-dependent Ginzburg-Landau equations are analyzed using a newly developed dynamic transition theory and a new classification scheme of dynamics phase transitions. First, we demonstrate that there are two type of dyn...	cond-mat_supr-con
Observation of enhanced coherence in Josephson SQUID cavities using a hybrid fabrication approach: We study the coherence of flux-tunable Josephson junction resonators made with two different fabrication processes. In the first process, devices are made using a single step of evaporation in which the resonator and th...	cond-mat_supr-con
Pre-formed Cooper pairs and Bose-Einstein condensation in cuprate superconductors: A two-dimensional (2D) assembly of noninteracting, temperature-dependent, pre-formed Cooper pairs in chemical/thermal equilibrium with unpaired fermions is examined in a binary boson-fermion statistical model as the Bose-Einstein conde...	cond-mat_supr-con
Magnetic Field Effect on the Supercurrent of an SNS junction: In this paper we study the effect of a Zeeman field on the supercurrent of a mesoscopic SNS junction. It is shown that the supercurrent suppression is due to a redistribution of current-carrying states in energy space. A dramatic consequence is that (part of...	cond-mat_supr-con
Spin-excitation anisotropy in the nematic state of detwinned FeSe: The origin of the electronic nematicity in FeSe is one of the most important unresolved puzzles in the study of iron-based superconductors. In both spin- and orbital-nematic models, the intrinsic magnetic excitations at $\mathbf{Q}_1=(1, 0)$ and $\mathb...	cond-mat_supr-con
Self-Consistent Vertex Correction Analysis for Iron-Based Superconductors: Mechanism of Coulomb-Interaction-Driven Orbital Fluctuations: We study the mechanism of orbital/spin fluctuations due to multiorbital Coulomb interaction in iron-based superconductors, going beyond the random-phase-approximation. For this purp...	cond-mat_supr-con
Magnetic flux pinning in superconductors with hyperbolic-tesselation arrays of pinning sites: We study magnetic flux interacting with arrays of pinning sites (APS) placed on vertices of hyperbolic tesselations (HT). We show that, due to the gradient in the density of pinning sites, HT APS are capable of trapping vort...	cond-mat_supr-con
Topological invariants beyond symmetry indicators: Boundary diagnostics for twofold rotationally symmetric superconductors: Topological crystalline superconductors are known to have possible higher-order topology, which results in Majorana modes on $d-2$ or lower-dimensional boundaries. Given the rich possibilities o...	cond-mat_supr-con
Evolution of correlation strength in KxFe(2-y)Se2 superconductor doped with S: We report the evolution of thermal transport properties of iron-based superconductor K$_x$Fe$_{2-y}$Se$_2$ with sulfur substitution at Se sites. Sulfur doping suppresses the superconducting $T_c$ as well as the Seebeck coefficient. The See...	cond-mat_supr-con
Superconducting transition temperatures of the elements related to elastic constants: For a given crystal structure, say body-centred-cubic, the many-body Hamiltonian in which nuclear and electron motions are to be treated from the outset on the same footing, has parameters, for the elements, which can be classified ...	cond-mat_supr-con
Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions: We report magnetic and electrical measurements of Nb Josephson junctions with strongly ferromagnetic barriers of Co, Ni and Ni80Fe20 (Py). All these materials show multiple oscillations of critical current with barrier thickness implying repeated 0-pi ...	cond-mat_supr-con
Topological states in normal and superconducting $p$-wave chains: We study a two-band model of fermions in a 1d chain with an antisymmetric hybridization that breaks inversion symmetry. We find that for certain values of its parameters, the $sp$-chain maps formally into a $p$-wave superconducting chain, the archetypica...	cond-mat_supr-con
Studies on Fabrication of Ag/HgBaCaCuO/CdSe Heterostructures by Pulse-Electrodeposition Route: Metal/superconductor/semiconductor (Ag/HgBaCaCuO/CdSe) heterostructures have been successfully fabricated using pulse-electrodeposition technique. The electrochemical parameters are optimized and diffusion free growth of Cd...	cond-mat_supr-con
Effects of Disorder on Superconductivity of Systems with Coexisting Itinerant Electrons and Local Pairs: We study the influence of diagonal disorder (random site energy) of local pair (LP) site energies on the superconducting properties of a system of coexisting local pairs and itinerant electrons described by the (h...	cond-mat_supr-con
Thermodynamic phase diagram and phase competition in BaFe2(As1-xPx)2 studied by thermal expansion: High-resolution thermal-expansion and specific-heat measurements were performed on single crystalline BaFe2(As1-xPx)2 (0 < x < 0.33, x = 1). The observation of clear anomalies allows to establish the thermodynamic phase...	cond-mat_supr-con
Pairing competition in a quasi-one-dimensional model of organic superconductors (TMTSF)$_{2}X$ in magnetic field: We microscopically study the effect of the magnetic field (Zeeman splitting) on the superconducting state in a model for quasi-one-dimensional organic superconductors (TMTSF)$_{2}X$. We investigate the co...	cond-mat_supr-con
Two-dimensional topological superconductivity candidate in van der Waals layered material: Two-dimensional (2D) topological superconductors are highly desired because they not only offer opportunities for exploring novel exotic quantum physics, but also possesses potential applications in quantum computation. However...	cond-mat_supr-con
Asymmetric Little-Parks Oscillations in Full Shell Double Nanowires: Little-Parks oscillations of a hollow superconducting cylinder are of interest for flux-driven topological superconductivity in single Rashba nanowires. The oscillations are typically symmetric in the orientation of the applied magnetic flux. Using do...	cond-mat_supr-con
Detection of the phase shift from a single quantized superconducting vortex: An Abrikosov vortex in a superconductor carries a flux quantum, Phi_0 = hc/2e, localized at its center, but induces a global 2pi phase rotation in the superconducting condensate. This long-range gauge field outside the area pierced by a magn...	cond-mat_supr-con
Superconducting fluctuations in the reversible magnetization of the iron-pnictide $Ba_{1-x}K_xFe_2As_2$: We report on isofield magnetization curves obtained as a function of temperature in two single crystals of $Ba_{1-x}K_xFe_2As_2$ with superconducting transition temperature $T_c$=28K and 32.7 K. Results obtained f...	cond-mat_supr-con
Synthesis and physical characterization of superconductivity-magnetism crossover compound RuSr2EuCeCu2O10: We carefully studied the nonsuperconducting sample of the magneto-superconducting RuSr2(Eu1-xCex)Cu2O10 series with composition RuSr2EuCeCu2O10. This compound seems to exhibit a complex magnetic state as reveale...	cond-mat_supr-con
Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review): The review is focused on one of the most exotic families of iron-based superconductors belonging to the AFeAs structural type, where A is alkali metal. We briefly concern physic...	cond-mat_supr-con
The role of domain walls on the vortex creep dynamics in unconventional superconducors: We investigate the influence of domain walls on the vortex dynamics in superconductors with multi-component order parameters. We show that, due to their complex structure domain walls can carry vortices with fractional flux quanta...	cond-mat_supr-con
Computational Materials Design for High Critical Temperature Superconductivity in Hole-Doped Delafossite CuAlO$_2$: Transparent Superconductors: We have calculated the superconducting critical temperature $T_c$ of hole-doped delafossite CuAlO$_2$ based on the first-principles calculations. According our calculation...	cond-mat_supr-con
The spin exchange interaction effect on Tc equation of anisotropic impure superconductors: We study the influence of spin exchange interaction of impurity scattering on critical temperature of anisotropic impure superconductors. The model of random nonmagnetic and magnetic impurity are revised to cover the effect of ...	cond-mat_supr-con
Vortex dynamics and losses due to pinning: Dissipation from trapped magnetic flux in resonant superconducting radio-frequency cavities: We use a model of vortex dynamics and collective weak pinning theory to study the residual dissipation due to trapped magnetic flux in a dirty superconductor. Using simple estimates,...	cond-mat_supr-con
Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2: We use inelastic neutron scattering to study the temperature and energy dependence of the spin excitation anisotropy in uniaxial-strained electron-doped iron pnictide BaFe$_{1.9}$Ni$_{0.1}$As$_2$ near optimal superconductivity (...	cond-mat_supr-con
Dynamic cluster quantum Monte Carlo simulations of a two-dimensional Hubbard model with stripe-like charge density wave modulations: Interplay between inhomogeneity and superconductivity: Using dynamic cluster quantum Monte Carlo simulations, we study the superconducting behavior of a 1/8 doped two-dimensional Hubb...	cond-mat_supr-con
Scanning SQUID study of ferromagnetism and superconductivity in infinite-layer nickelates: Infinite-layer nickelates $R_{1-x}$Sr$_{x}$NiO$_{2}$ ($R$ = La, Pr, Nd) are a class of superconductors with structural similarities to cuprates. Although long-range antiferromagnetic order has not been observed for these materi...	cond-mat_supr-con
Comparative Study of Dense Bulk MgB$_2$ Materials Prepared by Different Methods: We report on the results of a comparative investigation of highly dense bulk MgB$_2$ samples prepared by three methods: (i) hot deformation; (ii) high pressure sintering; and (iii) mechanical alloying of Mg and B powders with subsequent ...	cond-mat_supr-con
Generating Giant Spin Currents Using Nodal Topological Superconductors: In this work, we show that a giant spin current can be injected into a nodal topological superconductor, using a normal paramagnetic lead, through a large number of zero energy Majorana fermions at the superconductor edge. The giant spin current is...	cond-mat_supr-con
Characterization of superconducting nanowire single-photon detector with artificial constrictions: Statistical studies on the performance of different superconducting nanowire single-photon detectors (SNSPDs) on one chip suggested that random constrictions existed in the nanowire that were barely registered by scanni...	cond-mat_supr-con
Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn_5: The thermal conductivity of the heavy-fermion superconductor CeCoIn_5 has been studied in a magnetic field rotating within the 2D planes. A clear fourfold symmetry of the thermal conductivity which is characteristi...	cond-mat_supr-con
A model for critical current effects in point-contact Andreev-reflection spectroscopy: It is well known that point-contact Andreev reflection spectroscopy provides reliable measurements of the energy gap(s) in a superconductor when the contact is in the ballistic or nearly-ballistic regime. However, especially when t...	cond-mat_supr-con
Third harmonic generation from collective modes in disordered superconductors: Recent experiments with strong THz fields in both conventional and unconventional superconductors have clearly evidenced a marked third-harmonic generation below the superconducting temperature $T_c$. Its interpretation challenged substant...	cond-mat_supr-con
Effect of La Doping on the Crystal Structure, Electric, Magnetic and Morphologic Properties of the BSCCO System: Studies of the doping process can provide a better understanding of the superconducting mechanisms in cuprous oxide materials. In this work, we studied the doping effects on the crystal structure, electric...	cond-mat_supr-con
Coupling between dynamic magnetic and charge-order correlations in the cuprate superconductor Nd$_{2-x}$Ce$_{x}$CuO$_4$: Charge order has now been observed in several cuprate high-temperature superconductors. We report a resonant inelastic x-ray scattering experiment on the electron-doped cuprate Nd$_{2-x}$Ce$_{x}$Cu...	cond-mat_supr-con
Pair correlations of the hybridized orbitals in a ladder model for the bilayer nickelate La$_3$Ni$_2$O$_7$: To clarify the nature of high-temperature superconductivity in the bilayer nickelate La$_3$Ni$_2$O$_7$ under pressure, we investigate, using the density-matrix renormalization group method, the pair correlation...	cond-mat_supr-con
Pairing state in the rutheno-cuprate superconductor RuSr2GdCu2O8: A point contact Andreev Reflection Spectroscopy study: The results of Point Contact Andreev Reflection Spectroscopy on polycrystalline RuSr$_2$GdCu$_2$O$_8$ pellets are presented. The wide variety of the measured spectra are all explained in terms of...	cond-mat_supr-con
Epitaxial growth and electronic structure of Ruddlesden-Popper nickelates ($ \mathrm{La}_{n+1}\mathrm{Ni}_{n}\mathrm{O}_{3n+1}, n=1-5 $): We report the epitaxial growth of Ruddlesden-Popper nickelates, $ \mathrm{La}_{n+1}\mathrm{Ni}_{n}\mathrm{O}_{3n+1} $, with $ n $ up to 5 by reactive molecular beam epitaxy (MBE). ...	cond-mat_supr-con
Phase segregation of superconductivity and ferromagnetism at LaAlO$_3$/SrTiO$_3$ interface: The highly conductive two-dimensional electron gas formed at the interface between insulating SrTiO$_3$ and LaAlO$_3$ shows low-temperature superconductivity coexisting with inhomogeneous ferromagnetism. The Rashba spin-orbit ...	cond-mat_supr-con
A splitting integrator for the BCS equations of superconductivity: The BCS equations are the centerpiece of the microscopic description of superconductivity. Their space discretization yields a system of coupled ordinary differential equations. In this work, we come up with fast time evolution schemes based on a splitt...	cond-mat_supr-con
Anomalous optical absorption in overdoped cuprates near the charge-ordering instability: We propose an interpretation for the hump observed in the optical conductivity at or below a few hundreds of cm$^{-1}$, in overdoped cuprates like the electron-doped Nd_{2-x}Ce_xCuO_{4-y} at x\gtrsim 0.15 and the hole-doped Bi_2S...	cond-mat_supr-con
The excitation spectrum of mesoscopic proximity structures: We investigate one aspect of the proximity effect, viz., the local density of states of a superconductor-normal metal sandwich. In contrast to earlier work, we allow for the presence of an arbitrary concentration of impurities in the structure. The superconduc...	cond-mat_supr-con
Flux growth and physical properties of Mo3Sb7 single crystals: Millimeter sized single crystals of Mo3Sb7 are grown using the self-flux technique and a thorough characterization of their structural, magnetic, thermal and transport properties is reported. The structure parameters for the high-temperature cubic phase and...	cond-mat_supr-con
Possible "Magnéli" phases and self-alloying in the superconducting sulfur hydride: We theoretically give an infinite number of metastable crystal structures for the superconducting sulfur hydride H$_{x}$S under pressure. It has been thought that theoretically predicted structures of H$_{2}$S and H$_{3}$S exhibit low ...	cond-mat_supr-con
Measurements of surface impedance of superconductors as a function of frequency in microwave range: We report measurements of the complex resistivity in YBCO and MgB$_2$ thin films over a continuous frequency spectrum in the microwave range, making use of a Corbino disk geometry. The paper mainly focuses on the extra...	cond-mat_supr-con
Consequences of the peculiar intrinsic properties of MgB2 on its macroscopic current flow: The influence of two important features of magnesium diboride on the macroscopic transport properties of polycrystalline MgB2 is discussed in the framework of a percolation model. While two band superconductivity does not have ...	cond-mat_supr-con
Anomalous Surface Impedance due to Odd-frequency Cooper Pairs: We discuss dynamical response of odd-frequency Cooper pairs to electromagnetic field. By using the quasiclassical Green function method, we calculate the surface impedance (Z=R-iX) of a normal metal thin film which covers a superconductor. In contrast to th...	cond-mat_supr-con
Phase-sensitive determination of nodal $\mathbf{d}$-wave order parameter in single-band and multiband superconductors: Determining the exact pairing symmetry of the superconducting order parameter in candidate unconventional superconductors remains an important challenge. Recently a new method, based on phase sensiti...	cond-mat_supr-con
Inversion symmetry of Josephson current as test of chiral domain wall motion in Sr$_{2}$RuO$_{4}$: Clarifying the chiral domains structure of superconducting Sr$_{2}$RuO$_{4}$ has been a long-standing issue in identifying its peculiar topological superconducting state. We evaluated the critical current $I_{c}$ versus...	cond-mat_supr-con
Field-Induced Boson Insulating States in a 2D Superconducting Electron Gas with Strong Spin-Orbit Scatterings: The phenomenon of field-induced superconductor-to-insulator transitions observed experimentally in electron-doped SrTiO$_{3}$/LaAlO$_{3}$ interfaces, analyzed recently by means of 2D superconducting fluctuat...	cond-mat_supr-con
Divergent Vortex Mass in a Superconducting Film in Proximity to a Metal: We consider a moving vortex in a two dimensional superconductor located at a distance $d$ from a metallic overlayer. Starting from the microscopic imaginary time action we integrate out the electronic degrees of freedom to obtain a low energy, lon...	cond-mat_supr-con
Emergence of Superconductivity from Fully Incoherent Normal State in an Iron-Based Superconductor (Ba$_{0.6}$K$_{0.4}$)Fe$_2$As$_2$: In unconventional superconductors, it is generally believed that understanding the physical properties of the normal state is a pre-requisite for understanding the superconductivity mec...	cond-mat_supr-con
Pre-pairing and the "Filling" Gap in the Cuprates From the Tomographic Density of States: We use the tomographic density of states (TDoS), which is a measure of the density of states for a single slice through the band structure of a solid, to study the temperature evolution of the superconducting gap in the cuprates...	cond-mat_supr-con
Emergent superconductivity in van der Waals Kagome material Pd3P2S8 under high pressure: Kagome lattice systems have been proposed to host rich physics, which provide an excellent platform to explore unusual quantum states. Here, we report on the discovery of superconductivity in van der Waals material Pd3P2S8 under ...	cond-mat_supr-con
Character of ground state of an aperiodic frustrated Josephson junction array: We study the energy spectrum for an aperiodic Josephson junction ladder, as a function of frustration. Frustration is brought about by application of a transverse magnetic field, and aperiodicity is imposed by the arrangement of plaquettes...	cond-mat_supr-con
Antiferromagnetic Correlation and the Pairing Mechanism of the Cuprates and Iron Pnictides : a View From the Functional Renormalization Group Studies: We compare the one-loop functional renormalization group results for the cuprates and the iron pnictides. Interestingly a coherent picture suggesting that antiferromag...	cond-mat_supr-con
Approximate scaling relation for the anharmonic electron-phonon problem: An approximate scaling relation is found for the transition temperature to a charge-density-wave instability in the anharmonic electron-phonon problem, which maps a wide range of interaction strengths, anharmonicities, and phonon frequencies onto ...	cond-mat_supr-con
Temperature dependence of the spectral weight in p- and n-type cuprates: a study of normal state partial gaps and electronic kinetic energy: The optical conductivity of CuO2 (copper-oxygen) planes in p- and n-type cuprates thin films at various doping levels is deduced from highly accurate reflectivity data. The temp...	cond-mat_supr-con
Stabilization of an ambient pressure, collapsed tetragonal phase in CaFe2As2 and tuning of the orthorhombic / antiferromagnetic transition temperature by over 70 K by control of nano-precipitates: We have found a remarkably large response of the transition temperature of CaFe2As2 single crystals grown out of excess...	cond-mat_supr-con
Phase fluctuations and the pseudogap in YBa2Cu3Ox: The thermodynamics of the superconducting transition is studied as a function of doping using high-resolution expansivity data of YBa2Cu3Ox single crystals and Monte-Carlo simulations of the anisotropic 3D-XY model. We directly show that Tc of underdoped YBa2Cu3Ox is s...	cond-mat_supr-con
Surface density of states of s+-wave Cooper pairs in a two-band model: We calculate surface density of state (SDOS) of s+-wave Cooper pair in two-band superconductor model, where gap functions have different signs between two bands. We find that Andreev bound state appears at surface due to the sign change in the gap f...	cond-mat_supr-con
The effect of {11}^B substitution on the superconductivity in MgCNi3: The crystal structure of boron doped superconducting MgC_{1-x}{11}^B_{x}Ni_{3}, studied by powder neutron diffraction, is reported. The solubility limit of boron is determined to be approximately x=0.16. The unit cell expands from a = 3.81089(2) to 3...	cond-mat_supr-con
First-Order Reorientation of the Flux-Line Lattice in CaAlSi: The flux line lattice in CaAlSi has been studied by small angle neutron scattering. A well defined hexagonal flux line lattice is seen just above Hc1 in an applied field of only 54 Oe. A 30 degree reorientation of this vortex lattice has been observed in a v...	cond-mat_supr-con
Superconductivity in cuprates governed by topological constraints: The remarkable universality of the cuprate $T_c$ dome suggests a very fundamental unifying principle. Moreover, the superconducting gap is known to persist above $T_c$ in the pseudogap phase of all cuprates. So, contrary to BCS, the gap cannot be the or...	cond-mat_supr-con
Optical phonons along the c axis of YBa_2Cu_3O_{6+x}, for x=0.5 -> 0.95: The c-axis polarized phonon spectra of single crystals of YBCO_{6+x} have been measured for the doping range x=0.5 -> 0.95, between 10 K and 300 K. The low background electronic conductivity, determined by Kramers-Kronig analysis of the reflectanc...	cond-mat_supr-con
Phase transition in a chain of quantum vortices: We consider interacting vortices in a quasi-one-dimensional array of Josephson junctions with small capacitance. If the charging energy of a junction is of the order of the Josephson energy, the fluctuations of the superconducting order parameter in the system are consid...	cond-mat_supr-con
Multiple optical gaps and laser with magnonic pumping in 2D Ising superconductors: Ising superconductivity has been recently discovered in 2D transition metal dichalcogenides. We report that such superconductors have unusual optical properties controlled by the in-plane Zeeman field. First, we find several optical ga...	cond-mat_supr-con
Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe: We present a novel method for embedding spin and charge fluctuations in an anisotropic, multi-band and full-bandwidth Eliashberg treatment of superconductivity. Our analytical framework, based on the random p...	cond-mat_supr-con
Microwave properties of YBa$_2$Cu$_3$O$_{7-δ}$ films with BaZrO$_3$ nanoinclusions: We present measurements of the microwave complex surface impedance at 47.7 GHz in YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) films deposited by pulsed laser deposition with the explicit goal to introduce BaZrO$_3$ (BZO) nanoinclusions. Compos...	cond-mat_supr-con
Pseudogap and Amplitude Fluctuations in High Temperature Superconductors: Amplitude fluctuations of the pairing field are responsible together with phase fluctuations for the pseudogap phenomena in high temperature superconductors. Here we present the more detailed theory of the amplitude and phase fluctuations approac...	cond-mat_supr-con
Soliton induced critical current oscillations in two-band superconducting bridges: Using time-dependent Ginzburg-Landau theory we find oscillations of critical current density $j_c$ as a function of the length $L$ of the bridge formed from two-band superconductor. We explain this effect by appearance of the phase sol...	cond-mat_supr-con
Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements: Among the iron-based pnictide superconductors the material KFe$_2$As$_2$ is unusual in that its Fermi surface does not consist of quasi-nested electron and hole pockets. Here we report measu...	cond-mat_supr-con
Superconductivity with angular dependent coupling: stripes, Coulomb repulsion and enhanced Tc: We have analysed the effect of intrinsic doping inhomogeneity and the presence of stripes in high-T_c superconductors on coupling \lambda by using a simple analytically solvable model with an angular dependent \lambda (\phi...	cond-mat_supr-con
The Fulde-Ferrell-Larkin-Ovchinnikov state in pnictides: Fe-based superconductors (FeSC) exhibit all the properties of systems that allow the formation of a superconducting phase with oscillating order parameter, called the Fulde--Ferrell--Larkin--Ovchinnikov (FFLO) phase. By the analysis of the Cooper pair susceptibil...	cond-mat_supr-con
Optical determination of the superconducting energy gap in electron-doped Pr_{1.85}Ce_{0.15}CuO_4: The optical properties of single crystal Pr_{1.85}Ce_{0.15}CuO_4 have been measured over a wide frequency range above and below the critical temperature (T_c \simeq 20 K). In the normal state the coherent part of the co...	cond-mat_supr-con
Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe2As2: Using resistivity, heat-capacity, thermal-expansion, and susceptibility measurements we study the normal-state behavior of KFe2As2. We find that both the Sommerfeld coefficient gamma = 103 mJ mol-1 K-2 and...	cond-mat_supr-con
Magnetoresistance and Hall effect in e-doped superconducting SrLaCuO thin films: We have epitaxially grown c-axis oriented SrxLa1-xCuO2 thin films by rf sputtering on KTaO3 substrates with x = 0.12. The as-grown deposits are insulating and a series of superconducting films with various Tc(R=0) up to 26 K have been ob...	cond-mat_supr-con
d-Wave superconductivity on the checkerboard Hubbard model at weak and strong coupling: It has been argued that inhomogeneity generally can enhance superconductivity in the cuprate high-Tc materials. To check the validity of this claim, we study d-wave superconductivity on the checkerboard Hubbard model on a square l...	cond-mat_supr-con
Imaging Flux Vortices in MgB2 using Transmission Electron Microscopy: We report the successful imaging of flux vortices in single crystal MgB2 using transmission electron microscopy. The specimen was thinned to electron transparency (350 nm thickness) by focussed ion beam milling. An artefact of the thinning process wa...	cond-mat_supr-con
Iron-based superconductors: teenage, complex, challenging: The advent of iron-based superconductors in 2008 came as a complete surprise to the condensed matter community. Now 15 years later, they are beginning to impart some of their new-found wisdom on a slew of emerging superconductors that boast similar traits.	cond-mat_supr-con

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