Determining the absolute value of penetration depth of large area films
作者:
Ju Young Lee,
Young Hwan Kim,
Taek‐Sang Hahn,
Sang Sam Choi,
期刊:
Applied Physics Letters
(AIP Available online 1996)
卷期:
Volume 69,
issue 11
页码: 1637-1639
ISSN:0003-6951
年代: 1996
DOI:10.1063/1.117056
出版商: AIP
数据来源: AIP
摘要:
We report a method that allows the measurement of the absolute size of the magnetic penetration depth &lgr;(T) of large area YBa2Cu3O7−&dgr;films using the two‐coil method where a YBa2Cu3O7−&dgr;film is overlapped with a 1‐&mgr;m‐thick Pb film equivalent in size placed in the gap between the drive and receive coil. The drive coil has fewer counter turns on the top section than the bottom, which is closer to the film, so the film’s edge current would be suppressed and the accuracy that depends on geometry is greatly improved. The transition of the Pb film causes a steplike portion in the mutual inductanceM(T) graph and the resultant step height leads to the absolute value of &lgr;. ©1996 American Institute of Physics.
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