Abstract
Abstract We have measured the static susceptibility of a series of Cu Mn spin-glass alloys with concentration c = 1 to 6 at.% Mn in the temperature range 4 to 300 K. For temperature above 5Tf a Curie-Weiss law is obeyed with a positive θ, which is a strong, linear function of c. Below 5Tf there are deviations, which increase with decreasing temperature, from the Curie-Weiss law. We have analysed this behavior with a canonical ensemble for all possible states of the first eleven configurations in which magnetic impurities can be grouped in a f.c.c. lattice. The probability functions of these groups are calculated including atomic short range order. Thereby we can explain the deviations from Curie-Weiss law, the paramagnetic Curie temperature, the effective Bohr magneton number, and their concentration dependences for temperatures above 2Tf with nearest neighbor and next nearest neighbor exchanges of +50K and +20K, respectively.
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