SPIN-GLASS AND ANTIFERROMAGNET CRITICAL-BEHAVIOR IN A DILUTED FEE ANTIFERROMAGNET

We report on a Monte Carlo study of a diluted Ising antiferromagnet on a fee lattice. This is a typical model example of a highly frustrated antiferromagnet, and we ask whether sufficient random dilution of spi ns does produce a spin-glass phase. Our data strongly indicate the exi stence of a spin-glass transition for spin concentration p < 0.75: We find a divergent spin-glass susceptibility and a divergent spin-glass correlation length, whereas the antiferromagnetic correlation length s aturates in this regime. Furthermore, we find a first-order phase tran sition to an antiferromagnet for 1 greater than or equal to p > 0.85, which becomes continuous in the range 0.85 > p > 0.75. Finite-size sca ling is employed to obtain critical exponents. We compare our results with experimental systems as diluted frustrated antiferromagnets as Zn 1-pMnpTe.