Diamagnetism of YBa2Cu3O6+x crystals above Tc : evidence for Gaussian fluctuations

Kokanović, Ivan and Hills, D. J. and Sutherland, M. L. and Liang, R. and Cooper, J. R. (2013) Diamagnetism of YBa2Cu3O6+x crystals above Tc : evidence for Gaussian fluctuations. Physical Review B, 88 (6). 60505(R)-5. ISSN 1098-0121

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The magnetization of three high-quality single crystals of YBa2Cu3O6+x, from slightly overdoped to heavily underdoped, has been measured using torque magnetometry. Striking effects in the angular dependence of the torque for the two underdoped crystals, a few degrees above the superconducting transition temperature (Tc) are described well by the theory of Gaussian superconducting fluctuations using a single adjustable parameter. The data at higher temperatures (T) are consistent with a strong cut-off in the fluctuations for T >∼ 1.1Tc. Numerical estimates suggest that inelastic scattering could be responsible for this cut-off.

Item Type: Article
Keywords: high temperature superconductors, magnetism, superconducting fluctuations
Date: August 2013
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2013) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1008
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 26 Aug 2014 12:40
Last Modified: 23 Feb 2016 15:21
URI: http://digre.pmf.unizg.hr/id/eprint/2191

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