Resistive investigation of pseudogap state in non-stoichiometric ReBa₂Cu₃O_7-δ (Re = Y, Ho) single crystals with account for BCS-BEC crossover

Vovk, R.V.; Obolenskii, M. A.; Zavgorodniy, A. A.; Goulatis, I. L.; Chroneos, A. and Biletskiy, E. V. (2009). Resistive investigation of pseudogap state in non-stoichiometric ReBa₂Cu₃O_7-δ (Re = Y, Ho) single crystals with account for BCS-BEC crossover. Journal of Alloys and Compounds, 485(1-2) L21-L23.

Abstract

We investigate the conductivity in the basis plane of the non-stoichiometric ReBa₂Cu₃O_7-δ (Re = Y, Ho) single crystals. The excess conductivity (Δσ) is described by Δσ~(1-T/T*)exp(Δ_ab*/T) in the wide temperature range T_f < T< T*. where T* is the mean field temperature of the superconducting transition. We determined that the temperature dependence of the pseudogap (PG) is described in terms of the BCS-BEC crossover theoretical model It is observed that a reduction in the oxygen content leads to the widening of the temperature interval. in which the PG region is realized, and to the narrowing of the area of the ρ(T) linear dependence in the ab-plane

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