Abstract
AbstractMagnetic susceptibility behaviour is studied in weak dc and ac magnetic fields in the spin glass–paramagnetism transition region of the system (CuCr2Se4)x (Cu0.5Me0.5Cr2Se4)1−x (Me = In, Ga). The critical exponents γ, δ, and β in the spin glasses with x = 0,0.01 and 0.03 (Me = In) determined from the nonlinear static susceptibility χnl in the region of the freezing temperature T′f are in close agreement with values predicted by the mean field theory, Tf being determined by the maximum value of χnl. The experimental points χnl satisfactorily fit the scaling function in the critical range H < 30 Oe and (T − Tf)/Tf < 0.4. The freezing temperature T′f of spin glasses with 0 < x < 0.05 (Me = In, Ga), determined from the maximum initial susceptibility in the ac field depends on the measurement frequency according to the Vogel‐Fulcher law. The constant T0 in this law is close to Tf. The fact that static scaling relation and the Vogel‐Fulcher law hold for T′f indicates that spin glass–paramagnetism phase transition occurs in the spin glasses concerned.
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