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High-temperature superconductivity
About: High-temperature superconductivity is a research topic. Over the lifetime, 7263 publications have been published within this topic receiving 175377 citations. The topic is also known as: high-temperature superconductivity.
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TL;DR: In this article, the Andreev bound states at the surface of superconductors are observed for any pair potential showing a sign change in different k-directions with their spectral weight depending on the relative orientation of the surface and the pair potential.
Abstract: Andreev bound states at the surface of superconductors are expected for any pair potential showing a sign change in different k-directions with their spectral weight depending on the relative orientation of the surface and the pair potential. We report on the observation of Andreev bound states in high temperature superconductors (HTS) employing tunneling spectroscopy on bicrystal grain boundary Josephson junctions (GBJs). The tunneling spectra were studied as a function of temperature and applied magnetic field. The tunneling spectra of GBJ formed by YBa2Cu3O
(YBCO), Bi2Sr2CaCu2O
(BSCCO), and La1.85Sr0.15CuO4 (LSCO) show a pronounced zero bias conductance peak that can be interpreted in terms of Andreev bound states at zero energy that are expected at the surface of HTS having a d-wave symmetry of the order parameter. In contrast, for the most likely s-wave HTS Nd1.85Ce0.15CuO4-y (NCCO) no zero bias conductance peak was observed. Applying a magnetic field results in a shift of spectral weight from zero to finite energy. This shift is found to depend nonlinearly on the applied magnetic field. Further consequences of the Andreev bound states are discussed and experimental evidence for anomalous Meissner currents is presented.
52 citations
01 Jan 1997
TL;DR: In this paper, the authors studied the properties of high-tc superconductors in the context of the Ginzburg-Landau temperature, and the effect of the high-Tc temperature on the thermal conductivity of the superconductor.
Abstract: Preface. Part I: Near the Ginzburg-Landau Temperature. Fluctuation Phenomena in Superconductors A.A. Varlamov, M. Ausloos. c-Axis Transport in YBa2Cu3O7-delta O. Rapp, et al. Analysis of the Specific Heat Jump at Tc for SmBa2Cu3O7-delta T. Plackowski. Fluctuation Conductivity in a-b Plane and Along c-Axis in Films of YBaCuO S.K. Patapis. Fluctuation Thermoelectric Effect Above the Superconducting Transition D.V. Livanov. Magnetoresistance in HTSC far above Tc: Fluctuations versus Normal-State Contributions W. Lang, et al. Electric Field Effects in High-Tc Superconductors P. Konsin, et al. Effect of Fluctuations on the Thermal Conductivity of High-Tc Superconductors M. Houssa, et al. Fluctuation Phenomena in BSCCO (2212) Whiskers I.G. Gorlova, et al. The Fluctuation Induced Pseudogap in the Infrared Optical Conductivity of High Temperature Superconductors F. Federici, A.A. Varlamov. Specific Heat Studies of Low Dimensional High-Tc Superconductors A. Carrington, et al. D-Pairing in High Temperature Superconductors: Pro and Contra from the Fluctuation Phenomena Analysis P. Carretta, et al. Measurements of the Frequency Dependent Microwave Fluctuation Conductivity of Cuprate Thin Film Superconductors J. Booth, et al. Fluctuation Phenomena in Tunnel and Josephson Junctions A. Barone, A.A. Varlamov. The Role of Density of States Fluctuations on the c-Axis Resistivity of High Tc Superconductors G. Balestrino, et al. Part II: Near the Vortex-Lattice Melting Transition. The Effect of Disorder on Melting and Decoupling Transitions in Layered Superconductors N.K. Wilkin, H.J. Jensen. Vortex Line Fluctuations and Phase Transitions in Type II Superconductors Tao Chen, S. Teitel. Flux Lattice Melting in the Lowest Landau Level Approximation: Results in Three Dimensions D. Stroud, R. Sasik. Fluctuational Contribution to the Resistivity in YBa2Cu3O7-d in Magnetic Fields E. Silva, et al. Low Field Fluctuation Magnetoconductivity in Bi2Sr2CaCu2O8 and YBa2Cu3O7: Gaussian, Critical, and LLL Scalings P. Pureur, R. Menegotto Costa. Fluctuation Effects in Mixed State of Type II Superconductor A.V. Nikulov. Two Dimensional Vortex Fluctuations in High Tc Superconductors P. Minnhagen. Critical vs Lowest-Landau-level Scaling in the Ginzburg--Landau Theory I.D. Lawrie. Fluctuations in the Lattice Ginzburg--Landau Model S.A. Ktitorov, E.S. Babaev. Superconducting Transition Induced by Columnar Disorder in Strong Magnetic Field I. Herbut. Vortex Fluctuations in Vortex Liquids G. Carneiro. Magnetic Field Crossover Between 2D and 3D Regimes of Gaussian Fluctuations in Layered Superconductors A. Buzdin, V. Dorin. Part III: A Little Bit More Theoretical. Aspects of the D-Wave Superconductivity H. Won, et al. Universal Critical Quantum Properties of Cuprate Superconductors T. Schneider, J.M. Singer. Theory of Superconducting Fluctuations in the Strong Coupling Model B.N. Narozhny. Fluctuation Phenomena in Layered Superconductors R.A. Klemm. Anderson Theorem and Spatial Fluctuations in the Gap of Disordered Superconductors B.L. Gyorffy, et al. Berezinskii--Kosterlitz--Thouless Transition in Two-Dimen
52 citations
TL;DR: In this article, the powder-in-tube technique has been used to obtain critical current densities of up to 5.7 × 104 A cm−2 in zero magnetic field and up to 1.5 × 104 a cm −2 in a field of 26 T.
51 citations
TL;DR: In this paper, a pure phase of Pb 0.60 has been isolated for 0 ≤ x ≤ 0.50 and a nonsuperconducting sample x = 0.9 has been obtained from magnetic measurements with diamagnetic fraction volumes at 4 K. The enhancement of superconductivity by annealing under an oxygen flow is demonstrated.
51 citations
TL;DR: In this article, the authors reported the growth of high-quality c-axis-oriented cobalt (Co)-doped SrFe2As2 thin films with bulk superconductivity using an in situ pulsed laser deposition technique with a 248 nm wavelength KrF excimer laser and an arsenic (As)-rich phase target.
Abstract: 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 electronics. However, success in superconducting electronics has been limited because of difficulties in fabricating high-quality thin films. We report the growth of high-quality c-axis-oriented cobalt (Co)-doped SrFe2As2 thin films with bulk superconductivity by using an in situ pulsed laser deposition technique with a 248 nm wavelength KrF excimer laser and an arsenic (As)-rich phase target. The temperature and field dependences of the magnetization showing strong diamagnetism and transport critical current density with superior Jc-H performance are reported. These results provide necessary information for practical applications of Fe-based superconductors.
51 citations