Erzeugung und Ausheilung von Gitterstörungen und ihr Einfluß auf die Supraleitung von Indium und Thallium

The Variation of the transition temperature with residual resistance of coldworked In and Tl shows a similar behaviour as in dilute alloy experiments. Subsequent annealing removes lattice defects in distinct steps and restores the properties of pure samples at temperatures below 250 °K. Some of the results can be interpreted in accordance with the model developed byMarkowitz andKadanoff on alloy experiments. Values for the anisotropy parameter 〈a ²〉_In=0.02 and 〈a ²〉_Tl=0.04 were obtained. The interpretation of the “valence” effect and the influence of stress is discussed.