Low Temperature Physics: 32, 571 (2006); https://doi.org/10.1063/1.2215373 (5 pages)
Fizika Nizkikh Temperatur: Volume 32, Number 6 (June 2006), p. 746-752    ( to contents , go back )

Localization effects and pseudogap state in YBa2Cu3O7-d single crystals with different oxygen content

M.A. Obolenskii, R.V. Vovk, A.V. Bondarenko, and N.N. Chebotaev

V.N. Karazin Kharkov National University, 4 Svoboda sq., Kharkiv, 61077, Ukraine
E-mail: ruslan.v.vovk@univer.kharkov.ua

Received November 10, 2005, revised February 13, 2006


We have investigated the evolution of the temperature dependence of the in-plane and off-plane conductivity of YBa2Cu3O7–d single crystals due to the decrease of the oxygen content in the samples caused by a heat treatment. The concentration dependence of the in-plane and off-plane energy gaps has been determined. It has been shown that the enhancement of the localization effects results in a suppression of the pseudogap state. At the same time, the decrease of the oxygen content results in a relative narrowing of the temperature interval in which the regime of the fluctuating conductivity is realized.

74.72.Bk - Y-based cuprates

Key words: YBa2Cu3O7–d single crystals, preudogap, localization, oxygen content, crossover.

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