Three-dimensional XY critical fluctuations of the dc electrical conductivity in Bi2Sr2CaCu2O8+δ single crystals

被引：28

作者：

Han, SH ^{[1
]}

Eltsev, Y

Rapp, Ö

机构：

[1] Kungliga Tekn Hogskolan, Dept Solid State Phys, SE-10044 Stockholm, Sweden

[2] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.61.11776

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A method is presented to analyze the dc critical fluctuation conductivity Delta sigma of Bi2Sr2CaCu2O8+delta single crystals in zero magnetic field. Two crossovers are obtained upon approaching T-c; first the "Ginzburg" crossover from the mean-held region to the initial critical regime, where the critical exponent a of Delta sigma changes from -1/2 to -2/3, and then, closer to T-c, a crossover of alpha form -2/3 to 1/3 in the critical region. Good agreement is found with the expectations from the three-dimensional XY model.

引用

页码：11776 / 11779

页数：4

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