Coexistence of superconductivity and localization in Bi2Sr2(Ca-z,Pr-1-z)Cu2O8+y

被引：37

作者：

Beschoten, B ^{[1
]}

Sadewasser, S ^{[1
]}

Guntherodt, G ^{[1
]}

Quitmann, C ^{[1
]}

机构：

[1] UNIV DORTMUND,D-44221 DORTMUND,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.77.1837

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Charge transport in insulating and superconducting samples of Bi2Sr2(Ca-z,Pr-1-z)Cu2O8+y is analyzed in terms of the Hall mobility mu(T) = R(H)(T)/rho(T). Insulating samples (z less than or equal to 0.5) show a crossover from a hopping between localized states at low temperatures (d mu(-1)/dT < 0) to a delocalized metallic regime (d mu(-1)/dT > 0) at high temperatures. For hole contents just sufficient to obtain superconductivity (z > 0.5) we still observe such a minimum in the inverse mobility, although the resistivity rho(T) is purely metallic (d rho/dT > 0). This indicates that the Cooper pairs are formed by states which are spatially localized.

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页码：1837 / 1840

页数：4

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