Annealing effects on the normal-state resistive properties of underdoped cuprates

Abstract

The influence of room-temperature annealing on the parameters of the basal-plane electrical resistance of underdoped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ and HoBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals in the normal and superconducting states is investigated. The form of the derivatives $d\rho (T)/dT$ makes it possible to determine the onset temperature of the fluctuation conductivity and indicates a nonuniform distribution of the labile oxygen. Annealing has been revealed to lead to a monotonic decrease in the oxygen deficiency, that primarily manifests itself as a decrease of the residual resistance, an increase of $T_c$, and a decrease of the Debye temperature.

arXiv comment5 pages, 4 figures

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