The Anisotropy of the Penetration Depth in Superconducting Tin.
HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS
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The temperature dependence of the penetration depth in superconducting tin was measured using a dc magnetometer. The high sensitivity of the SQUID magnetometer used allowed this to be done on bulk samples to an accuracy of 1A. Single crystals of tin were used as samples in order to measure the anisotropy with respect to crystallographic orientations. Some theories on the penetration depth are presented. They are found to be inadequate for accurate comparison with the present data, because they are either based on the isotropic model or are not easily applicable to tin. To serve as a guide and hopefully to stimulate interest, the present data is fitted to the BCS theory by varying some parameters. The fit is reasonable but some deviations still remain. Modified author abstract
- Solid State Physics