Magnetotransport properties in Hg-1201 single crystals

被引：7

作者：

Daignere, A

Wahl, A

Hardy, V

Maignan, A

机构：

[1] ISMRA Univ Caen, UMR 6508 CNRS, Lab CRISMAT, F-14050 Caen, France

[2] Univ Caen, F-14050 Caen, France

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2001年 / 349卷 / 3-4期

关键词：

magnetotransport properties; mercury-based cuprates; superconductivity fluctuations; pseudogap;

D O I：

10.1016/S0921-4534(00)01518-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The in-plane (rho (ab)) and out-of-plane (rho (c)) resistivities have been determined on a nearly optimized (Hg(0.8)Cu(0.2))Ba(2)CuO(4+delta) (Hg-1201) single crystal (T(c) similar to 94 K). The obtained resistivities values, rho (ab) (300 K) = 510 mu Omega cm and rho (c) (300 K) = 0.35 Omega cm, provide a room temperature anisotropy ratio (rho (c)/rho (ab))1/2 = 26. Temperature dependencies of both resistivities show a curvature change at a same temperature, T, which suggests a pseudogap opening at this temperature. From rho (ab)(T, B) measurements under magnetic field, a positive magnetoresistivity is found, and the scaling of the fluctuations reveals that a 2D-3D crossover occurs for this cuprate. Such a dimensional change was not observed by magnetization measurements. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：189 / 195

页数：7

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