A High Resolution Positron Annihilation Study of the Fermi Surface of α Phase CuGe

A point detector geometry with a resolution of 0.7 mrad. by 1.1 mrad. has been used to study the Fermi surface for several α phase alloys of Cu Ge. The variation of the [111] neck diameter and the [110] Fermi radius has been determined as a function of geranium concentration. Comparisons are made with previous work on this and other copper alloy systems, and also with the rigid band predictions.