ACTA

Critical Behaviour of the Mean-Field Ferromagnet Cu_1.02[Cr_1.77Ti_0.24]Se₄

J. Krok-Kowalski^a, G. Władarz^a, P. Rduch^a, E. Malicka^b, T. Groń^a and A. Guzik^a
^aInstitute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
^bInstitute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland

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Magnetization, M, and susceptibility, χ, measurements showed both strong lowering of magnetic moment in comparison with CuCr₂Se₄ matrix and zero-field-cooling-field-cooling susceptibility splitting characteristic for the spin-glass behaviour. Isothermal magnetization curves, M(H), easy saturate and large values both of the Curie T_C=253 K and Curie-Weiss θ=283.5 K temperatures indicate the ferromagnetic order which coexists with the spin-glass state. The critical behaviour investigated around the paramagnetic-ferromagnetic phase transition revealed that the values of critical exponents are close to those predicted by the mean field model for long-range magnetic interactions.

DOI: 10.12693/APhysPolA.122.1102
PACS numbers: 75.40.Cx, 75.50.Dd, 64.60.Ht