By W F Vinen (auth.), Nicole Bontemps, Yvan Bruynseraede, Guy Deutscher, Aharon Kapitulnik (eds.)

ISBN-10: 9401044228

ISBN-13: 9789401044226

ISBN-10: 9401109745

ISBN-13: 9789401109741

One of the main miraculous effects of the outline of the superfluid condensate in superfluid He or in superconductors as a unmarried macroscopic quantum nation is the quantization of stream, leading to quantized vortex traces. This ebook attracts no contrast among superfluid He3 and He4 and superconductors. The reader will locate the basic introductory chapters and the newest theoretical and experimental growth in our knowing of the vortex country in either superconductors and superfluids, from lectures given by means of best specialists within the box, either experimentalists and theoreticians, who accumulated in Cargèse for a NATO ASI. The atypical positive aspects with regards to brief coherence lengths, 2nd geometry, excessive temperatures, disease, and pinning are completely mentioned.

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2. Ginzburg-Landau Theory A good starting point for a theoretical understanding of the structure of vortices in type-II superconductors is the isotropic Ginzburg-Landau (GL) theory [Ginzburg and Landau (1950), Werthamer (1969), Fetter and Hohenberg (1969)]. The essential components of the theory are two coupled equations, which complement Maxwell's equations. One of the GL equations governs the spatial variation of the superconducting order parameter, which is a quantity similar to the wave function in ordinary quantum mechanics.

1. Introduction The past five years have been a time of great ferment in the study of hightemperature superconductors. there is now considerable understanding of the remarkable behavior of these materials in a magnetic field. The theoretical analysis of vortex fluctuations in these extreme Type II materials requires only an underlying Ginzburg-Landau theory with a BCS-like order parameter. The basic conclusions are independent of the precise microscopic mechanism, and rely instead on the remarkably different Ginzburg-Landau parameters (coherence length, temperature range and anisotropy) which distinguish the cuprates from their low T c counterparts.

Civale, L. and Thomson, 1. O. (1992) Appl. Phys. Lett. 60, 2306. Tilley, D. R. (1965) Proc. Phys. Soc. London 85, 1977; 86,289. Tilley, D. , Van Gurp, G. , and Berghout, C. W. (1964) Phys. Lett. 12,305. von Laue, M. (1952) Theory of Superconductivity, Academic Press, New York. Werthamer, N. R. (1969), in R. D. ), Superconductivity, Vol. 1, Dekker, New York, p. 321. Pinning, Fluctuations and Melting of Superconducting Vortex Arrays· David R. Nelson Lyman Laboratory of Physics Harvard University Cambridge, Massachusetts 02198 ABSTRACT.

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The Vortex State by W F Vinen (auth.), Nicole Bontemps, Yvan Bruynseraede, Guy Deutscher, Aharon Kapitulnik (eds.)


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