Zur Supraleitung sehr stark gestörter Schichten aus Hg mit HgBr₂- und HgCl₂-Zusatz

Abstract

Hg-films were condensed with admixtures of HgBr₂ or HgCl₂ onto a substrate at 4.2 °K. The superconducting transition temperature is measured as a function of the impurity concentration. The transition temperature increases from 3.96 °K of the pure quenched film to 4.06 °K at a content of 0.3 mol.% HgBr₂. Higher impurity concentrations lower the transition temperature and superconductivity vanishes at about 16 mol.% HgBr₂ or 23 mol.% HgCl₂ respectively. Above these concentrations the electrical resistivity shows a negative temperature coefficient. By means of Debye-Scherrer diagrams there is found a diminishing of the crystallite size with increasing impurity concentration.