Comments on the paramagnetic curie temperature in amorphous magnetic alloys

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Abstract
In the problem of dilute magnetic impurities randomly distributed in the lattice sites of a non-magnetic matrix and coupled to one another through the RKY interaction (e.g. Cu–Mn alloys), the paramagnetic Curie temperature T c, calculated from a sum over lattice sites of the interactions, is finite. Korn's measurements for Mn dissolved in Cu and other non-magnetic substrates find T c to be zero. This is explained quite plausibly if the substrate is amorphous : replacing the lattice sum by an integral involving a suitable choice for the pair correlation function, one calculates T c to be much more nearly zero.