Critical measurements in the spin glass CuMn

R. Omari , J.J. Prejean , J. Souletie

We present experimental data on the magnetization M(H) 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

Domaines: Articles anciens

R. Omari, J.J. Prejean, J. Souletie. Critical measurements in the spin glass CuMn. Journal de Physique, 1983, 44 (9), pp.1069-1083. ⟨10.1051/jphys:019830044090106900⟩. ⟨jpa-00209692⟩