Magnetoresistance of the semiconducting spinelide Cu0.625Ga0.375Cr2Se4 having a low-temperature long-range magnetic order spin glass transitionстатья
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Аннотация:A study is reported of the dependence of magnetoresistance Delta rho/rho on the square of magnetization sigma(2) of the semiconducting spinelide Cu0.625Ga0.375Cr2Se4, which exhibits a low-temperature transition from long-range magnetic order (LRMO) to the spin glass (SG) state in strong magnetic fields. It is shown that at the freezing temperature T-f the Delta rho/rho(sigma(2)) relations change their slope, and that below T-f this slope is about one half that for T>T-f This finding, together with the earlier observation that the freezing temperature does not depend on the frequency of the ac magnetic field in which it was measured, suggests that the spin-glass phase consists of spins of individual Cr3+ ions, and that the SG-LRMO crossover is a phase transition. (C) 1998 American Institute of Physics.