ANISOTROPIC LOW-TEMPERATURE MAGNETORESISTIVITY IN THE NORMAL-STATE OF L2-XCEXCUO4 SINGLE-CRYSTALS

被引：4

作者：

CRUSELLAS, MA ^{[1
]}

FONTCUBERTA, J ^{[1
]}

PINOL, S ^{[1
]}

机构：

[1] CSIC, INST CIENCIA MAT, CAMPUS UNIV AUTONOMA BARCELONA, E-08193 BARCELONA, SPAIN

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1994年 / 226卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90210-0

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report in-plane rho(ab)(T, H) and c-axis rho(c)(T, H) electrical magnetoresistivity measurements on several L2-xCexCuO4 (L = Pr, Sm, Nd) superconducting single crystals. It is found that in the normal state both resistivities rho(ab)(T) and rho(c)(T) display a minimum at certain temperatures T(min)ab and T(min)c which separates regions of metallic behavior at T > T(min) from semiconducting-like behavior at T < T(min) In the low-temperature region (T < T(min)), rho(ab)(T) has a logarithmic temperature dependence rho(ab) almost-equal-to -In T and negative magnetoresistivity which are argued to be due to 2D localization effects. In contrast, at low temperatures, rho(c)(T) can be described in terms of a hopping conductivity.

引用

页码：311 / 319

页数：9

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