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Probing of highTcsample texturing with a potentiometric ring

 

作者: Thomas W. Krause,   R. K. Nkum,   W. R. Datars,   Vladimir V. Gridin,  

 

期刊: Journal of Applied Physics  (AIP Available online 1992)
卷期: Volume 71, issue 11  

页码: 5554-5559

 

ISSN:0021-8979

 

年代: 1992

 

DOI:10.1063/1.350531

 

出版商: AIP

 

数据来源: AIP

 

摘要:

An inhomogeneously textured ring prepared from a diffused Bi2Sr2CaCu2O thick film has been arranged for the measurement of longitudinal,VL, and transverse,VT, voltages with three diametrical pairs of contacts. The film was deliberately grown in such a way that one half of the ring has a high degree of texturing with theaaxis perpendicular to the sample plane. In the second, less textured half, a finer granular structure is present implying the presence of more grain boundaries. The application of an external magnetic field perpendicular and parallel to the sample plane clearly shows that an anisotropic weak link behavior from the inhomogeneous texturing is responsible for the minimum observed inVTbelowTc. The reduction of this minimum with increasing magnetic field is explained in terms of the loss of superconducting paths due to increased dissipation at grain boundaries in the more textured branch.

 

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