Abstract
A cryostat is described which allows to reach any temperature between 10 and 320° K in less than 4 min and to maintain it within ±0·1° K. The resistance of quenchingly condensated Cu, Pb, Sn, In, and Hg films is investigated. During isochronal annealing the high residual resistance after condensation decreases irreversibly, i.e. the mean free path of the electrons increases. By the annihilation of the lattice defects also the slope of the temperature dependent resistance is altered. This behaviour can be explained with the Bloch-Grüneisen theory by lowered characteristic temperaturesΘ R, which approach after annealing at higher temperatures the values of the bulk metals. The known shifts of the transition temperature of superconducting films after condensation are interpreted by these loweredΘ R-values, which are caused by volume increase, and the small mean free path of the normal electrons.
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Meinem verehrten Lehrer, Herrn Professor Dr. R.Hilsch, möchte ich für die stete Förderung dieser Arbeit danken. Für viele anregende Diskussionen bin ich Herrn Dr. W.Sander zu Dank verpflichtet. Die Durchführung der Arbeit wurde durch Mittel der Fraunhofer-Gesellschaft ermöglicht.
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Mönch, W. Über die charakteristische TemperaturΘ R abschreckend kondensierter Metallschichten. Z. Physik 170, 93–104 (1962). https://doi.org/10.1007/BF01378312
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DOI: https://doi.org/10.1007/BF01378312