Resistive investigation of pseudogap state in non-stoichiometric ReBa2Cu3O7-δ (Re = Y, Ho) single crystals with account for BCS-BEC crossover

被引：45

作者：

Vovk, R. V. ^{[2
]}

Obolenskii, M. A. ^{[2
]}

Zavgorodniy, A. A. ^{[2
]}

Goulatis, I. L. ^{[2
]}

Chroneos, A. ^{[1
]}

Biletskiy, E. V. ^{[3
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[2] Kharkov Natl Univ, UA-61077 Kharkov, Ukraine

[3] Univ New Brunswick, Dept Elect & Comp Engn, Fredericton, NB E3B 5A3, Canada

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 485卷 / 1-2期

关键词：

ReBa2Cu3O7-delta; (Re; Y; Ho) single crystals; Pseudogap; Excess conductivity; GAP STATE; OXYGEN; SUPERCONDUCTORS; CONDUCTIVITY; YBCO;

D O I：

10.1016/j.jallcom.2009.05.132

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigate the conductivity in the basis plane of the non-stoichiometric ReBa2Cu3O7-delta (Re = Y, Ho) single crystals. The excess conductivity (Delta sigma) is described by Delta sigma similar to(1-T/T*)exp(Delta(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 rho(T) linear dependence in the ab-plane (C) 2009 Elsevier B V. All rights reserved.

引用

页码：L21 / L23

页数：3

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