Abstract
The influence of high hydrostatic pressure on the transition temperatureT c has been investigated for the superconductors of group Va of the Periodic Table up to 45 kbars. Results obtained for tantalum, showing a negative pressure effectdT c /dp, are in good agreement with earlier observations. For vanadium and niobium, however,dT c /dp is found to be positive with an initial slope 1.76 · 10−5 °K/bar and 1.2 · 10−5 °K/bar respectively. In addition, a very strong influence onT c anddT c /dp of lattice defects produced by plastic deformation at low temperatures has been observed for V and Nb. Comparatively small increases of the residual resistance yield an increase ofT c and a pronounced minimum in theT c -p-dependence for both metals.
The results are discussed with regard to possible influence of pressure on the density of states and the Debye temperature.
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Herrn Prof. Dr. W.Buckel und Herrn Dr. W.Gey danke ich herzlich für wertvolle Ratschläge und Diskussionen. Die Deutsche Forschungsgemeinschaft unterstützte die Arbeit durch Bereitstellung von Geräten.
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Köhnlein, D. Supraleitung von Vanadium, Niob und Tantal unter hohem Druck. Z. Physik 208, 142–158 (1968). https://doi.org/10.1007/BF01380119
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DOI: https://doi.org/10.1007/BF01380119