Die Supraleitung von Zinn und Blei unter sehr hohem Druck |
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Authors: | Jörg Wittig |
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Institution: | 1. Physikalisches Institut der Technischen Hochschule Karlsruhe, Deutschland
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Abstract: | The dependence of the critical temperatureT c upon pressureP is measured in the pressure range up to 160 kbar. The experimental technique developed for very high pressure-low temperature experiments (preceding article) is improved by introducing a double-sample electrical resistance cell. An internal pressure calibration is therefore possible at some well-established room temperature pressure reference points commonly used. Both metals, tetragonal white tin and fcc-lead, show a monotonic decrease ofT c vs.P with upward curvature. The results recommend the use of Pb as a secondary standard for very high pressure experiments at Helium temperatures. In addition, high pressure polymorphic modifications of Sn and Pb are found to show superconductivity withT c =(5.30±0.10) ?K for Sn III atP=113 kbar andT c =(3.55±0.10) ?K for Pb II atP=160 kbar. |
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