Topic
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, X-ray diffraction indicates a high degree of preferential growth of the c axis perpendicular to the substrate and measurements of the upper critical field Bc2(T) of these films show critical field slopes (Bc2≡−dBc2/dT at Tc) of 8.5 and 0.56 T/K, respectively.
Abstract: Superconducting films of Bi‐Sr‐Ca‐Cu oxides have been grown on MgO substrates by multitarget magnetron sputtering. After post‐annealing in an oxygen atmosphere, zero resistance was obtained at about 80 K. X‐ray diffraction indicates a high degree of preferential growth of the c axis perpendicular to the substrate. Measurements of the upper critical field Bc2(T) of these films show critical field slopes (B’c2≡−dBc2/dT at Tc) of 8.5 and 0.56 T/K, respectively, for B parallel and perpendicular to the substrate. The anisotropy of ∼15 and the Bc2∥ are the highest values yet reported for high‐temperature superconductors.
39 citations
TL;DR: In this article, the authors present an analysis for the maximum operating current density that ensures intrinsic stability in thin-film superconductors, which depends on the amount of released energy, the Biot number, the aspect ratio, and the ratio of the thermal conductivities in the plane of the film and normal to it.
Abstract: Intrinsic thermal stability denotes a situation where a superconductor can carry the operating current without resistance at all times after the occurrence of a localized release of thermal energy. This novel stability criterion is different from the cryogenic stability criteria for magnets and has particular relevance to thin-film superconductors. Crystals of ceramic high-temperature superconductors are likely to exhibit anisotropic thermal conductivity. The resultant anisotropy of highly oriented films of superconductors greatly influences their thermal stability. This work presents an analysis for the maximum operating current density that ensures intrinsic stability. The stability criterion depends on the amount of released energy, the Biot number, the aspect ratio, and the ratio of the thermal conductivities in the plane of the film and normal to it.
39 citations
TL;DR: In this paper, the interaction between well-separated Abrikosov vortices is calculated for superconductors with K 1/√2 a λ-transition takes place at Hc1, changing into a first order transition as K → 1/ √ 2.
39 citations
TL;DR: In this article, the LDA band structure of novel hole doped high temperature superconductors (Tc~30K) was compared with previously studied electronic structure of isostructural FeAs superconductor BaFe2As2 (Ba122).
Abstract: We present LDA band structure of novel hole doped high temperature superconductors (Tc~30K) KxFe2Se2 and CsxFe2Se2 and compare it with previously studied electronic structure of isostructural FeAs superconductor BaFe2As2 (Ba122). We show that stoichiometric KFe2Se2 and CsFe2Se2 have rather different Fermi surfaces as compared with Ba122. However at about 60% of hole doping Fermi surfaces of novel materials closely resemble those of Ba122. In between these dopings we observe a number of topological Fermi surface transitions near the G point in the Brillouin zone. Superconducting transition temperature Tc of new systems is apparently governed by the value of the total density of states (DOS) at the Fermi level.
39 citations
TL;DR: Monte Carlo simulations of the uniformly frustrated three-dimensional [ital XY] model are carried out, as a model for vortex-line fluctuations in a high-[ital T][sub [ital c]] superconductor in an external magnetic field, finding two sharp phase transitions.
Abstract: We carry out Monte Carlo simulations of the uniformly frustrated three-dimensional XY model, as a model for vortex-line fluctuations in a high-${\mathit{T}}_{\mathit{c}}$ superconductor in an external magnetic field. A density of vortex lines of f=1/25 is considered. We find two sharp phase transitions. The low-T superconducting phase is an ordered vortex-line lattice. The high-T normal phase is a vortex-line liquid, with much entangling, cutting, and loop excitations. An intermediate phase is found, which is characterized as a vortex-line liquid of disentangled, approximately straight, lines. In this phase, the system displays superconducting properties in the direction parallel to the magnetic field, but normal behavior in planes perpendicular to the field. A detailed analysis of the vortex structure function is carried out.
39 citations