Effect of high pressure on the fluctuation conductivity and the charge transfer of YBa2Cu3O7−δ single crystals

• Published in: Journal of alloys and compounds Vol. 453; no. 1-2; pp. 69 - 74
• Main Authors: Vovk, R.V., Obolenskii, M.A., Zavgorodniy, A.A., Bondarenko, A.V., Goulatis, I.L., Samoilov, A.V., Chroneos, A.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 03-04-2008; Elsevier
• Subjects: Charge transfer; Coherence length; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fluctuation conductivity; Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.); High pressure; Physics; Superconductivity; YBa2Cu3O7−δ single crystals; Coherence length; 71.20.Eh; 74.40.+k; YBa2Cu3O7−δ single crystals; 72.10.−d; Charge transfer; Fluctuation conductivity; 74.72.−h; High pressure; Fluctuations; Electrical conductivity; Pressure effects; Ion distribution; Nonstoichiometry; Monocrystals; Hydrostatic pressure; High-Tc superconductors; 71.20.Eh; 72.10.-d; 74.40.+k; 74.72.-h; High pressure; YBa2Cu3O7-δ single crystals; Fluctuation conductivity; Charge transfer; Coherence length; Barium Copper Yttrium Oxides Mixed
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2006.11.169

The influence of hydrostatic pressure of up to 11kbar on the fluctuation conductivity in the ab plane of the YBa2Cu3O7−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.