Ground state superconducting phase fluctuations as a precursor for strong critical fluctuations in high-T_c superconductors

Cooper, John R. and Babić, Dinko and Loram, J. W. and Lo, Wai and Cardwell, D. A. (1999) Ground state superconducting phase fluctuations as a precursor for strong critical fluctuations in high-T_c superconductors. Fizika A, 8 (4). pp. 333-344. ISSN 1330-0008

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Abstract

We analyse the reversible magnetisation and heat capacity of YBa_2Cu_3O_7-δ in the "vortex liquid" state and find that both properties are reasonably well described by the 3D XY critical-fluctuation model. The free-energy density in the "vortex liquid" state has a particularly simple form over a wide range of fields (H) and temperatures (T). This leads us to a picture in which the presence of critical fluctuations in high-T_c superconductors is directly linked to the remarkably small number of overlapping Cooper pairs at T=0 and H=0 rather than low dimensionality or high temperatures.

Item Type: Article
Keywords: high-Tc materials, magnetisation, heat capacity, critical fluctuations
Date: 1999
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 14 Apr 2014 18:05
Last Modified: 14 Apr 2014 18:05
URI: http://digre.pmf.unizg.hr/id/eprint/821

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