Transverse resistance of YBa2Cu3O7-δ single crystals

被引:4
作者
Vovk, R. V. [1 ]
Khadzhai, G. Ya. [1 ]
Dobrovolskiy, O. V. [1 ,2 ]
Nazyrov, Z. F. [1 ]
Chroneos, A. [3 ]
机构
[1] V Karazin Kharkiv Natl Univ, Dept Phys, UA-61077 Kharkov, Ukraine
[2] Goethe Univ, Inst Phys, D-60438 Frankfurt, Germany
[3] Coventry Univ, Fac Engn & Comp, Coventry CV1 5FB, W Midlands, England
关键词
Superconducting cuprates; Transverse resistance; Anisotropy; Electrical resistance measurements; FLUCTUATION CONDUCTIVITY; ELECTRICAL-RESISTIVITY; INSULATOR-TRANSITION; HIGH-PRESSURE; SUPERCONDUCTIVITY; RELAXATION; PSEUDOGAP; PARACONDUCTIVITY; PRASEODYMIUM; TEMPERATURE;
D O I
10.1016/j.cap.2015.02.016
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Measured is the transverse electrical resistance of YBa2Cu3O7-delta single crystals with different oxygen deficiency values (delta) in the temperature range T-c -300 K. The experimental data are approximated by an empiric expression accounting for the fluctuation conductivity near T-c and the semiconductor-like resistance regime. Our analysis of the concentration dependences of the fitting parameters, in particular, reveals that the resistance temperature dependence is largely affected by the sample's non-homogeneity. The latter, in turn, causes a T-c anisotropy and variable-range hopping conductivity between different phases. The deduced maximal values of the basal-plane coherence length, xi(xy)(0), are comparable with those for low-temperature superconductors. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:617 / 621
页数:5
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