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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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26 Sep 2007
TL;DR: In this paper, a model of high-temperature superconductors and superconductivity is presented. But the model is based on the Eden Model and is not suitable for high temperature superconducting materials.
Abstract: Superconductors and Superconductivity: General Issues.- High-Temperature Superconductors: Overview.- Composition Features and HTSC Preparation Techniques.- Experimental Investigations of HTSC.- Carbon Problem.- General Aspects of HTSC Modeling.- Modeling of BSCCO Systems and Composites.- Modeling of YBCO Oxide Superconductors.- Modeling Conductive and Elastic Properties of Superconductive Composites.- Computer Simulation of HTSC Microstructure and Toughening Mechanisms.- Mechanical Destructions of HTSC Josephson Junctions and Composites.- Modeling of Electromagnetic and Superconducting Properties of HTSC.- Classification of Superconductors.- Finite Element Implementation of Carbon-Induced Embrittlement Model.- Macrostructure Modeling of Heat Conduction.- Computational Algorithms for Definition of Structure-Sensitive Properties of some HTSC Ceramics and Composites.- Eden Model.
32 citations
32 citations
TL;DR: In this paper, a detailed magnetic study of the (Bi, Pb)-2223 superconductors was carried out over the temperature range 4-120 K and the results showed that the lower critical field H c1 was drastically enhanced at temperatures below 25 K. This enhancement can probably be explained either by a theory based on an intrinsic proximity effect in the normal layers of the Bi-2223 unit cell or by blocking of the flux penetration because of a surface barrier effect.
Abstract: A detailed magnetic study of the (Bi, Pb)-2223 superconductors was carried out over the temperature range 4–120 K. At temperatures below 25 K the lower critical field H c1 was drastically enhanced. This enhancement can probably be explained either by a theory based on an intrinsic proximity effect in the normal layers of the Bi-2223 unit cell or by a blocking of the flux penetration because of a surface barrier effect. An analysis of the anomalies in the irreversibility line has been undertaken in the framework of the proximity effect allowing us to obtain also plausible values for ξ 0 , λ 0 and the Fermi velocities in the superconducting and normal layers. The temperature dependence of the large remanent magnetization at 4 K with a drastic decrease above 25 K offered evidence for a strong depinning of the vortex lattice around 25 K. Below this temperature the active pinning centers have a rather small pinning energy. Above 25 K a smaller group of pinning centers with larger activation energy gives rise to a small and weakly temperature-dependent remanent magnetization. A scaling behavior of the magnetization curves was obeyed in the temperature range between 40 and 60 K in good agreement with the predictions of an extended Bean model.
32 citations
TL;DR: In this paper, the optical reflectivity spectra of new superconductors (La1-xMx)2CuO4 (M=Ba, Ca, Sr) were investigated and a plasma edge was observed at almost the same position for all compositions x and for all substituents.
Abstract: The optical reflectivity spectra of new superconductors (La1-xMx)2CuO4 (M=Ba, Ca, Sr) were investigated In the spectra for the metallic samples, a plasma edge was observed at almost the same position for all compositions x and for all substituents Based on the two-dimensional tight-binding model, the conduction band width was estimated to be about 1 eV from the value of the observed plasma energy
32 citations
TL;DR: In this article, the deterioration of superconductive properties of the YBa 2 Cu 3 O 7− y system due to the reaction with water was investigated by measurements of resistivity and magnetic susceptibility.
31 citations