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Download e-book for kindle: Anisotropy Effects in Superconductors by H. Teichler (auth.), Harald W. Weber (eds.)

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By H. Teichler (auth.), Harald W. Weber (eds.)

Considering the big development completed in a few specified components of superconductivity over the last few years, it appeared helpful to debate completely a topic, which has encountered serious seasoned­ blems at the theoretical and the experimental aspect, specifically the consequences of the anisotropic electron and phonon houses of (single crystalline) fabrics at the attribute beneficial properties of the tremendous­ engaging in country. the truth that nearly all of scientists actively engaged during this study box at the moment have been introduced jointly on the assembly, has resulted in a nearly entire insurance of the pertinent themes during this quantity. Six evaluate papers talk about the improvement and the current country of concept and test in regards to the anisotropies of the higher severe box and the magnetization in addition to the flux line lattice and the superconducting power hole. additionally, 18 papers current the latest learn on those houses and extra anisotropy results linked to the intermediate nation styles or the explicit warmth. about the magnetic houses, impressive contract among concept and scan has been completed; nonetheless, arguable perspectives concerning the life of anisotropy within the superconducting power hole are awarded. In either situations, how­ ever, theorists and experimentalists are nonetheless faced with a couple of open questions. it's the objective of this ebook to attract the eye of scientists to those attention-grabbing difficulties. Harald W.

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G, 373 (1970) /34/ K. Hubert, Proc. LTI4, Helsinki 1975, ed. by M. Krusius and ~·1. Vuorio (North Holl and, Amsterdam and American Elsevier, New York) vol. sol. (b) ~, 453 (1971); ibid. Peter Oepartement de Physique de la Matiere Condensee Universite de Geneve, CH-1211 Geneve 4, Switzerland Abstract We investigate the influence of Fermi surface anisotropy on the upper critical field Hc2 (T) of bulk type-II superconductors within the framework of an effective two-band model for the electron gas.

Melik-Barkhudarov, Soviet Phys. G. Matricon, Physik d. Rev. Gor'kov, Soviet Phys. JETP 1Q, 998 (1960); Soviet Phys. Werthamer, Proc. Lno, t,1oscow 1966, ed. by M. Ma 1kov, vol. IIA, p. Phys. Phys. C. Rev. Gough, Solid State Comm. Court, Solid State Comm. Rev. Rev. Phys. Genberg, Proc. LTI4, Helsinki 1975, ed. Vuorio (North Holland, Amsterdam and American Elsevier, New York) vol. Rev. Lett. Lett. 50A, 291 (1974); cf. Lett. Lett. 24, 1061 (1970); cf. Hilliamson, ref. Phys. Rev. Rev. Rev. g, 373 (1970) /34/ K.

By choosing reasonable values for the coupling constants and for the lifetimes we find that an enhancement of the Hc2 (O)-values by more than 100% is possible /1/. 1 recently /2/. 1. e. Hc2 (T) =Hc2(T,~,8). In polycrystalline or in very dirty samples this effect should vanish. (2) Fermi surface anisotropy or the existence of two or more conduction bands leads in pure samples to enhanced Hc2 (T) values with respect to the corresponding Hc2 (T) values of a single band isotropic superconductor /3/.

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