Hall-Effekt abschreckend kondensierter Schichten des Systems Zinn-Kupfer

Tin alloys with different contents of copper between 0 and 100 atomic-% are produced by simultaneous condensation of the two components onto a cooled substrate. The electrical resistance, the transition temperature of superconductivity, and the Hall coefficient of the films are measured immediately after condensation, during annealing to about 350? K, and recooling to helium temperatures. The observed properties of such alloys differ considerably from those of bulk material. A rather high transition temperature of about 7? K is observed for copper contents of more than 8 atomic-%. The high transition temperature disappears in connection with cristallisation of the tin component during annealing. Simultaneously with this change of the transition temperature a sharp decrease of the negative Hall coefficient occurs. The results are discussed with regard to a possible influence of the hole concentration on the superconductivity of tin.