XXII. The magnetic susceptibilities of some diamagnetic alloys: The primany solid solutions of zinc, gallium, germanium and arsenic in copper

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Abstract
The results of the measurements, by a modified Gouy method, of the rates of change of the diamagnetic susceptibility with concentration in the solid solution region of the four systems are presented. A method of alloy preparation is given which, although conducive to some lateral and vertical segregation, produces a sound melt. The magnetic properties of the systems are discussed theoretically. 4.H interpretation follows for which it is assumed that all the electrons outside the 3d10 shell occupy states in the band and that all but one contribute their normal atomic diamagnetism. Instead of a parabolic band with a positive slope, it is found necessary to use a hand which has approximately the same negative slope as that calculated by Jones (1937) for pure copper. The constancy of the density of states curve at the top of the band for a one-dimensional alloy is demonstrated by a first order perturbation treatment. The atomic magnetic susceptibilities as calculated from the self-consistent fields without exchange are given for: Zn2+, Zn(4s)l, Ga3+, Ga(4s)2, Ge4+, Ge(4s)2(4p)1, As5+, AS(4S)2(4P)2, Al3+, A1(3s)2, Si4+, C0 and with exchange for Si4+ and C0. The results of a preliminary examination of twenty-nine copper, silver and gold based solid solutions are mentioned. They show the absence of the paramagnetism that would be expected from the existence of the singly occupied states predicted by Mott (1952) and Friedel (1952).

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