Temperature dependence of the magnetic anisotropy of metallic Y-Ba-Cu-O single crystals in the normal phase

Miljak, M. and Zlatić, V. and Kos, I. and Aviani, I. and Hamzić, Amir and Collin, G. (1990) Temperature dependence of the magnetic anisotropy of metallic Y-Ba-Cu-O single crystals in the normal phase. Physical Review B, 42 (16). pp. 10742-10745. ISSN 1098-0121

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Abstract

The magnetic anisotropy measurements of metallic Y-Ba-Cu-O compounds in the normal phase reveal a temperature-dependent diamagnetic component of the susceptibility that increases with decreasing temperature. The temperature variation of the susceptibility anisotropy and its total change do not seem to be much affected by the presence of the superconductivity at some lower temperature and could not be accounted for by superconducting fluctuations. Rather, the data remind one of the behavior of some quasi-two-dimensional metals with anisotropic Fermi surfaces, reflecting the properties of the low-energy excitations in the normal phase. The anisotropy measurements above the bulk superconducting transition temperature Tc reveal the nonlinear effects, which are due to the onset of superconductivity in disconnected grains. The existence of a two-step transition, typical for granular superconductors, should be taken into consideration if the normal-phase susceptibility data are compared with the theoretical predictions in the vicinity of Tc.

Item Type: Article
Date: December 1990
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1990) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 19 May 2014 19:37
Last Modified: 19 May 2014 19:37
URI: http://digre.pmf.unizg.hr/id/eprint/1474

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