Abstract
A recently developed Ginzburg-Landau-type equation has been used to analyze measurements of the effect of stress on first-order superconducting transitions of tin whiskers. Assumptions were made as to the temperature dependence of the effective penetration depth and the validity of simple similarity. The analysis is in terms of three parameters of bulk tin. The critical temperature was measured directly at each stress. The other two parameters, namely the zero-temperature values of the critical field and the effective penetration depth, were computed at each stress by an optimization procedure. Combination of the three parameters gives a reasonable estimate of the average Fermi velocity but cannot reveal if this is stress-dependent. The critical temperature is known to increase linearly with stress along the tetragonal axis and quadratically at right angles to it, and the critical magnetic field is found to increase similarly at a slightly higher rate. The results are compared with those obtained for the same whiskers in the second-order region, and also with other measurements of related properties, such as the change in length of bulk single crystals at the superconducting transition.
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Rothberg-Bibby, B.D., Fink, H.J., McLachlan, D.S. et al. Ginzburg-Landau analysis of first-order transitions of elastically strained superconducting tin whiskers. J Low Temp Phys 53, 375–404 (1983). https://doi.org/10.1007/BF00682485
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DOI: https://doi.org/10.1007/BF00682485