Superconducting transition temperature inε-phase Ag-Zn alloys

Abstract

Superconducting transition temperatures were measured in four $\ensuremath{\epsilon}$-phase alloys in the Ag-Zn system, in order to obtain a relation between the electron-phonon interaction and the electron concentration (electrons per atom, $\mathfrak{z}$.) The results show that the strength of the interaction increases with $\mathfrak{z}$ throughout the $\ensuremath{\epsilon}$-phase range but the increase becomes negligible for values of $\mathfrak{z}$ exceeding about 1.85. This change of behavior appears to coincide with the onset of electron overlaps across the {00.2} faces of the Brillouin zone, as indicated by other properties.