Funct. Mater. 2014; 21 (4): 394-398.
Aging-effect in optimal doped Yba2Cu3O7-δ single crystals
V.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
We investigate the conducting properties of the optimally oxygen doped YBa2Cu3O7-δ single crystals in the basal ab-plane before and after a long time exposure (aging) at air atmosphere. Prolonged exposure leads to increase of amount of the effective scattering centers of the normal carriers. The excess conductivity in a wide temperature range has exponential temperature dependence and near the critical temperature (Tc) is well described within the Aslamazov-Larkin theoretical model. Here we show that the prolonged exposure leads to a great extention of temperature range of the pseudogap state implementation and to narrowing the linear section of the dependence ρab(T).
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