AIP Digital Archive
Magnetization-versus-temperature (M-vs-T) measurements in a fixed field on cubic pseudobinary Tb0.3Y0.7Ag show that M for increasing and then decreasing T bifurcates at the antiferromagnetic Néel point (TN=36 K), where M is maximum. The resulting thermoremanence (MR), which decays very slowly with time, diminishes with increasing T and vanishes at TN. Thus, the long-range antiferromagnetism appears to coexist with spin-glass ordering. Measurements of MR with increasing T were also made for different cooling fields (Hc1) The changes of MR with Hcl and T are found to reduce to a universal relationship between the temperature-normalized quantities, m=MR/M0(T) and h=Hcl /H0(T). Setting both the initial slope of m vs h and the saturation m at high h equal to unity, we determine that M0(T)=M0(0) exp (−T/T0), with M0(0)=0.82μB/Tb atom and T0=4.3 K, and that H0(T) varies analogously, with H0(0)=225 kOe and the same T0. A similar temperature scaling of MR vs Hcl , with similar exponential forms for M0(T) and H0(T), has been deduced earlier for Ag-Mn and other canonical spin glasses.
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