Journal of Applied Physics 101,9 (2007) 09D511;
Magnetic properties of single crystalline Ga1-xMnxS (x=0.09) have been measured near the spin-glass transition. No other III-VI DMS is currently known to exhibit a spin-glass transition for comparison with Ga1-xMnxS. Ga1-xMnxS (T-c=11.2 K) shows unexpected similarity to II-VI DMS Zn1-xMnxTe (T-c=20.8 K). For both systems, the quantity chi(nl)=-M-nl/H (where M-nl=M-total-M-linear) diverges as the temperature approaches the spin-glass transition temperature T-c from above. It also increases with applied field at temperatures just above T-c for both systems. The spin-glass transitions in both Ga1-xMnxS and Zn1-xMnxTe follow the same universal scaling function with the same critical exponent values (gamma=4.0 +/- 1.0 and beta=0.8 +/- 0.2). The temperature of Ga1-xMnxS's low-field spin-glass transition cusp was found to occur at 10.9 K. As expected, this is slightly lower than the true spin-glass transition temperature T-c=11.2 +/- 0.2 K obtained from the scaling analysis. The asymptotic, zero-field limit of the spin-glass transition cusp was found to persist at 10.9 K up to similar to 1 T before being suppressed to lower temperatures with increasing field. Questions remain about if Ga1-xMnxS should belong in the same universality class as Zn1-xMnxTe since Ga1-xMnxS is quasi-two-dimensional and Zn1-xMnxTe is three-dimensional.
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