期刊
CURRENT APPLIED PHYSICS
卷 14, 期 12, 页码 1779-1782出版社
ELSEVIER
DOI: 10.1016/j.cap.2014.10.002
关键词
YBCO single crystals; Doping; Hydrostatic pressure; Fluctuation conductivity; Coherence length
The effect of high hydrostatic pressure up to 17 kbar on the fluctuation conductivity of lightly Pr-doped Y1-xPrxBa2Cu3O7-delta (x approximate to 0.05) single crystals is investigated. We show that in contrast to non-doped YBa2Cu3O7-delta samples, application of a high pressure leads to a substantial increase of the pressure derivative of the coherence length d xi(c)/dP and a temperature shift of the 2D-3D crossover point. Possible mechanisms of the influence of high pressure on the critical temperature and the coherence length are discussed within the framework of a model assuming the presence of singularities in the charge carriers electron spectrum typical for lattices with strong coupling. (C) 2014 Elsevier B.V. All rights reserved.
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