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, a new process for making Tl•Ba•Ca•Cu•O superconductors which is based on reactions between solid precursor Ba•Ca−Cu•oxides and vapor Tl2O3 has been developed.
Abstract: A new process for making Tl‐Ba‐Ca‐Cu‐O superconductors which is based on reactions between solid precursor Ba‐Ca‐Cu‐oxides and vapor Tl2O3 has been developed. The Tl2O3 vapor process allows Tl‐Ba‐Ca‐Cu‐O superconductors to be easily made in the forms of complex bulk components, wires and fibers, and thick and thin films, and minimizes problems caused by toxicity and volatility of Tl starting compounds.
38 citations
TL;DR: In this paper, a thin interlayer is incorporated in ramp-type Josephson junctions to obtain an increased transparency, restoring the surface damaged by ion milling and leading to clean and well-defined interfaces.
Abstract: A thin interlayer is incorporated in ramp-type Josephson junctions to obtain an increased transparency. The interlayer restores the surface damaged by ion milling and has the advantage of an all in situ barrier deposition between two superconductors, leading to clean and well-defined interfaces. The method has been applied to Josephson junctions between high (YBa2Cu3O7–) and low temperature (Nb) superconductors, separated by a Au barrier. Transmission electron microscopy images of these junctions reveal crystalline YBa2Cu3O7– up to the interface with the Au barrier. The junctions have improved critical current density values exceeding 20 kA/cm2, normal state resistances of 3×10–8 cm2 and IcRn products of 0.7 mV at 4.2 K. Furthermore, the junction properties can be controlled by varying the Au barrier thickness.
38 citations
TL;DR: In this article, a review of recent advances in the melt process of (RE) −Ba-Cu-O [(RE)BCO, where RE represents a rare earth element] single grain high-temperature superconductors (HTSs), bulks and its applications are discussed.
Abstract: This paper reviews recent advances in the melt process of (RE)–Ba–Cu–O [(RE)BCO, where RE represents a rare earth element] single grain high-temperature superconductors (HTSs), bulks and its applications. The efforts on the improvement of the magnetic flux pinning with employing the top-seeded melt-growth process technique and using a seeded infiltration and growth process are discussed. Which including various chemical doping strategies and controlled pushing effect based on the peritectic reaction of (RE)BCO. The typical experiment results, such as the largest single domain bulk, the clear TEM observations and the significant critical current density, are summarized together with the magnetization techniques. Finally, we highlight the recent prominent progress of HTS bulk applications, including Maglev, flywheel, power device, magnetic drug delivery system and magnetic resonance devices.
38 citations
TL;DR: Thermal activation energies for single vortices and vortex bundles in the presence of a magnetic field parallel to the layers are calculated and it may be possible to observe the effects discussed in this paper in a pure enough sample.
Abstract: Thermal activation energies for single vortices and vortex bundles in the presence of a magnetic field parallel to the layers are calculated. The pinning considered is intrinsic and is due to the strongly layered structure of high-temperature superconductors. The magnetic field and the current dependence of the activation energy are studied in detail. The calculation of the activation energy is used to determine the current-voltage characteristic. It may be possible to observe the effects discussed in this paper in a pure enough sample.
38 citations
TL;DR: In this paper, the relationship between the cold-work deformation process and the superconducting properties of the wires was systematically studied and it was found that flat rolling can efficiently increase the mass density of the core, thus, significantly improving the transport critical current density (Jc) of the drawn wires.
Abstract: Seven-core Ag/Fe sheathed Sr0.6K0.4Fe2As2 (Sr-122) superconducting wires were produced by the ex situ powder-in-tube method. The relationship between the cold-work deformation process and the superconducting properties of the wires was systematically studied. It was found that flat rolling can efficiently increase the mass density of the superconducting core, thus, significantly improving the transport critical current density (Jc) of the as-drawn wires. The transport Jc of the best sample achieved 21.1 kA/cm2 at 4.2 K in self field, and showed very weak magnetic field dependence at high fields. Our result suggested a promising future of multifilamentary iron-based superconductors in practical applications.
38 citations