Effect of high pressure on the fluctuation conductivity and the charge transfer of YBa₂Cu₃O_7−δ single crystals

Vovk, R.V.; Obolenskii, M.A.; Zavgorodniy, A. A.; Bondarenko, A. V.; Goulatis, I. L.; Samoilov, A. V. and Chroneos, A. (2008). Effect of high pressure on the fluctuation conductivity and the charge transfer of YBa₂Cu₃O_7−δ single crystals. Journal of Alloys and Compounds, 453(1-2) pp. 69–74.

DOI: https://doi.org/10.1016/j.jallcom.2006.11.169

URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

The influence of hydrostatic pressure of up to 11 kbar on the fluctuation conductivity in the ab plane of the YBa₂Cu₃O_7−δ, (YBCO) single crystals with various oxygen concentrations is studied. In contrast to samples of stoichiometric composition, the application of high pressure on samples with oxygen deficiency, leads to the decrease of the coherence length perpendicular to the ab plane ξc(0). The pressure-induced redistribution of the labile oxygen causes a shift of the temperature interval in which three-dimensional superconducting fluctuations exist and a diffusion redistribution of the labile components from the phase of lower critical temperature to the high-temperature superconducting phase.

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