期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 355, 期 1-2, 页码 135-139出版社
ELSEVIER
DOI: 10.1016/S0921-4534(00)01771-8
关键词
fluctuations; magnetoconductivity; density of slates; high temperature superconductors
The in-plane (delta sigma (ab)(T,H)) and out-of-plane (delta sigma (c)(T,H)) components of the magnetoconductivity tenser of Bi2Sr2CaCu2O8+x films have been simultaneously measured in magnetic fields parallel to the film conducting planes (B less than or equal to 1 T). A negative c-axis magnetoresistance is measured for the first time in this geometry. Both delta sigma (ab) and delta sigma (c) are well described by the fluctuation theory in the temperature range T-c < T < T-c + 20 K, using a single set of microscopical parameters for both directions. The negative c-axis magnetoresistance in the field parallel to conducting layers is shown to be induced by the density of states Zeeman fluctuation contribution. (C) 2001 Elsevier Science B.V. All rights reserved.
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