Investigation of the mixed state of YBa2Cu3O7−&dgr;superconductors
作者:
A. Forkl,
T. Dragon,
H. Kronmu¨ller,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 67,
issue 6
页码: 3047-3053
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.345434
出版商: AIP
数据来源: AIP
摘要:
The magneto‐optical Faraday effect has been used to observe the penetration of magnetic flux into sintered YBa2Cu3O7−&dgr;. In addition, measurements of the magnetic polarization are performed with a SQUID magnetometer. The magneto‐optical Faraday effect shows an inhomogeneous penetration of the magnetic flux into the sample. In a first step the flux penetrates into the intergranular regions and in a second step into single grains separately. A spatial gradient of the flux density within each grain is built up, indicating pinning forces. In the remanent state in each grain trapped flux is observed. The measured magnetization curves show good agreement with the magneto‐optical investigations of the flux penetration.
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