SUPERCONDUCTING, THERMAL AND MAGNETIC SUSCEPTIBILITY BEHAVIOR OF SOME INTERMETALLIC COMPOUNDS WITH FLUORITE STRUCTURE

AuGa2 becomes superconducting at 1.12°K. The superconducting critical temperature rises rapidly with small additions of Pd. For the composition corresponding to Au0.95Pd0.05Ga2, Tc = 1.79°K and then remains essentially constant with further increase in Pd content. The electronic contribution to the heat capacity, γ, increases in a similar manner. At Au0.95Pd0.05Ga2 the change in γ amounts to 18.4 per cent per atomic per cent Pd. All of the Au1-xPdxGa2 materials are diamagnetic and the diamagnetism decreases with increasing Pd content. The behavior of the susceptibility per gram atom,χA, at 0°K as a function of Pd content parallels the behavior of Tv, γ, and the 71Ga Knight shift in these allows [2]. AuAl2 and AuIn2, becomes superconducting below 0.1°K and both show temperature independent diamagnetism, in contrast to the behavior of AuGa2. © 1969.