The Anisotropy of the Penetration Depth in Superconducting Tin

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 aniso...

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Bibliographic Details
Main Author: Tai,Patrick Chung Loung
Format: Report
Language:English
Subjects:
ANISOTROPY
BCS THEORY
CRYOGENICS
FIELD THEORY
MAGNETIC FIELDS
MAGNETOMETERS
MEISSNER EFFECT
Solid State Physics
SUPERCONDUCTING QUANTUM INTERFERENCED DEVICES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEST EQUIPMENT
TIN
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Summary: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)