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Sharp angular sensitivity of pinning due to twin boundaries in Ba2YCu3O7

 

作者: E. M. Gyorgy,   R. B. van Dover,   L. F. Schneemeyer,   A. E. White,   H. M. O’Bryan,   R. J. Felder,   J. V. Waszczak,   W. W. Rhodes,   F. Hellman,  

 

期刊: Applied Physics Letters  （AIP Available online 1990）
卷期: Volume 56, issue 24  

页码: 2465-2467

 

ISSN:0003-6951

 

年代: 1990

 

DOI:10.1063/1.103257

 

出版商: AIP

 

数据来源: AIP

 

摘要:

We have measured the pinning force due to twin boundaries by measuring the magnetic torque produced when a field is applied perpendicular to thecaxis and rotated with respect to theabaxes. At 76 K, the torque increases roughly fourfold, when the field is within 2° of the parallel to the twin boundaries. This peak is absent at 27 K. Irradiation with 5×1016cm−23.5 MeV protons increases the overall critical current and eliminates the peaks observed at 76 K.

 

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