Showing papers on "High-temperature superconductivity published in 1982"

High-temperature superconductivity

Abstract: Possible methods of significantly raising the critical temperature of superconductors are presented, and the physical properties of applicable systems are examined. A review of the problems of high-temperature superconductivity is presented, and critical temperature considerations are given. In addition, attention is given to electron-phonon interaction in metals and lattice stability problems, superconductivity in three-dimensional quasi-isotropic systems, and possible increases in critical temperature due to structural-transition-induced electron spectrum changes. Finally, other topics discussed include electronic properties and superconductivity of layered crystals, properties of systems with one-dimensional anisotropy, sandwich type superconducting systems, and superconductivity under nonequilibrium conditions.

High-temperature superconductivity.

Abstract: Possible methods of significantly raising the critical temperature of superconductors are presented, and the physical properties of applicable systems are examined. A review of the problems of high-temperature superconductivity is presented, and critical temperature considerations are given. In addition, attention is given to electron-phonon interaction in metals and lattice stability problems, superconductivity in three-dimensional quasi-isotropic systems, and possible increases in critical temperature due to structural-transition-induced electron spectrum changes. Finally, other topics discussed include electronic properties and superconductivity of layered crystals, properties of systems with one-dimensional anisotropy, sandwich type superconducting systems, and superconductivity under nonequilibrium conditions.

Theory of Magnetic Superconductors

Abstract: The problem of magnetic superconductors is a long standing one [9.1,2]. After the BCS theory was formulated in which electrons are paired with opposite spins and momenta, it was realized that this kind of electron correlation is in conflict with ferromagnetic order since the latter requires an electron-spin polarization. Yoshida [9.3] calculated explicitely the vanishing of the spin susceptibility in a BCS superconductor as the temperature T approaches zero. Stimulated by the experimental findings of a nonvanishing Knight shift [9.4], it was first realized by Ferrell [9.5] that a spin-orbit interaction of the conduction electrons will lead to a finite spin susceptibility in a superconductor even at T = 0. Anderson [9.6] cast the theory for spin-orbit scattering into the concept of a generalized pairing prescription in terms of time-reversed states. This concept was further extended by Baltensperger and Strassler [9.7] who showed that an antiferromagnet can be a superconductor. The field gained new impact by the development of Green’s function techniques by Abrikosov and Gor’kov [9.8] who applied them to the treatment of the influence of magnetic impurities on superconductivity. Treating the exchange interaction between conduction electrons and impurities in the Born approximation, they predicted the phenomenon of gapless superconductivity which was later found by Reif and Woolf [9.9]. Earlier pionering work on that problem by Suhl, Anderson and others is summarized in [9.10].