Some peculiarities of the kinetics of labile oxygen in underdoped single crystals of YBa2Cu3O7–x
Yu.I. Boiko, V.V. Bogdanov, R.V. Vovk, and G.Ya. Khadzhai
V.N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv 61022, Ukraine
Received November6, 2017
The time dependence of the electrical conductivity of YBa2Cu3O7–x single crystals with different degrees of oxygen content is investigated. It is shown that the accelerated transport of oxygen ions at the initial stage of the process is realized along one-dimensional clusters of nonstoichiometric vacancies by the mechanism of single-file diffusion. The final stage of the redistribution of oxygen ions in the investigated compound is described by the classical mechanism of bulk diffusion. At the same time, the degree of deviation from oxygen stoichiometry significantly influences the change in the duration of time intervals corresponding to the mechanisms of single-file and bulk diffusion of labile oxygen.
74.72.–h Cuprate superconductors.
Key words: YBa2Cu3O7–x single crystals, oxygen stoichiometry, annealing, relaxation, single-file diffusion.
Published online: February 26, 2018