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Abstract : We present experimental data on the magnetization MH of a CuMn 1 at. % in the range Tc≤ T ≤ 4 Tc, 0 < H < 7 teslas. We took special precautions in order to eliminate systematic errors and improve the reliability of the data. It was then possible to study the temperature dependence of the first coefficients A 1, A3, A5 in the expansion of the low field magnetization data in terms of odd powers of FORMULA, in the range 1.1 Tc ≤ T ≤ 4 Tc. From the divergence of A3 and A5 which vary over 3 and 6 orders of magnitude respectively in this range, we derive two exponents γ = 3.25, β = 0.75 ± 0.25 which allow the rescaling of all our data points onto a universal function. The success of the scaling argument is strong evidence in favour of the existence of a phase transition in three dimensions for RKKY spin glasses.

Mots-clés : copper alloys magnetic transitions magnetisation manganese alloys spin glasses

Autor: R. Omari J.J. Prejean J. Souletie



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