Showing papers on "High-temperature superconductivity published in 1970"
TL;DR: In this paper, the exciton mechanism of superconductivity has been investigated for the production of high temperature superconductors, for which the critical temperature T c would reach hundreds of degrees, or at least liquid air temperature.
Abstract: The critical temperature, T c, for all presently known superconductors does not exceed 20°K. This fact obviously limits the range of applications of superconductivity in technology in a very fundamental way. On the whole, the reason why the value of T c for ‘ordinary’ superconductors should not exceed 20–40 °K is fairly well understood on the basis of the existing theory of superconductivity. At the same time, there apparently could exist high temperature superconductors for which the temperature T c would reach hundreds of degrees, or at least liquid air temperature. Possible means of producing high temperature superconductors are considered in this article. Special attention is paid to what can be called the exciton mechanism of superconductivity.
400 citations
TL;DR: In this article, the depression of the superconducting transition temperature due to the pair breaking effect of magnetic impurities is calculated exactly within the Nagaoka-Suhl approach to the Kondo problem in superconductors.
Abstract: The depression of the superconducting transition temperature due to the pair breaking effect of magnetic impurities is calculated exactly within the Nagaoka-Suhl approach to the Kondo problem in superconductors.
116 citations
109 citations
94 citations
TL;DR: In this article, a two-band model for the flux-flow resistivity and the Hall angle of type-II superconductors in low magnetic field regions is studied using the Bardeen-Stephen theory.
Abstract: A two-band model for the flux-flow resistivity and the Hall angle of type-II superconductors in low magnetic field regions is studied using the Bardeen–Stephen theory. The original theory considers...
12 citations
10 citations
9 citations
8 citations
TL;DR: In this article, it was shown that superconductivity can arise only if two bands of a different character are present at the Fermi surface or if the band is strongly deformed by Bragg planes near the surface.
4 citations
TL;DR: In this article, it was shown that Friedel oscillations in granular superconductors give rise to an energy gap at the Fermi surface which reduces the transition temperature.
3 citations
TL;DR: In this paper, the third critical field of a system comprising a thin superconducting film deposited on the flat surface of a massive superconductor is calculated and a qualitative explanation is given for the experimentally-observed dependence of the critical field on the mechanical and heat treatment of the surface.
Abstract: The third critical field of a system comprising a thin superconducting film deposited on the flat surface of a massive superconductor is calculated. It is considered that the film differs from the substrate simply in respect of the mean free path of the electrons. Two limiting cases are considered: those of a thin and a thick film respectively. A qualitative explanation is given for the experimentally-observed dependence of the third critical field of a superconductor on the mechanical and heat treatment of the surface.