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Funct. Mater. 2017; 24 (4): 527-529.

doi:https://doi.org/10.15407/fm24.04.527

Single-file diffusion in oxygen underdoped ReBa2Cu3O7-x (Re=Y, Ho) single crystals

Y.I.Boiko, V.V.Bogdanov, R.V.Vovk, A.G.Ort, Yu.V.Litvinov

V.Karazin Kharkiv National University,4 Svobody Sq., 61022 Kharkiv, Ukraine

Abstract: 

Analysis of the kinetics of relaxation processes observed at room temperature in the ReBa2Cu3O7-x (Re=Y, Ho) compounds, having a high-temperature superconductivity is made. It was concluded that the initial (faster) stage of these processes is controlled by a single-file diffusion of oxygen along one-dimensional chains of vacancies, forming in the oxygen sub-lattice of compound with a deficit of oxygen, and final (slow) stage controls by the usual classical diffusion. Presented and discussed the results of two-stage relaxation of the electrical resistance of above mentioned compounds which were a long time (more than three days) at room temperature in air.

Keywords: 
ReBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> single crystals, oxygen vacancies, annealing processes, diffusion mechanism.
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