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Origin of spin-glass behavior of Zn_1-xMn_xO

arXiv:cond-mat/0207349

Abstract

ac susceptibility has been studied for polycrystalline Zn$_{1-x}$Mn$_x$O. Stoichiometric samples demonstrate Curie-Weiss behavior, which indicates mostly antiferromagnetic interactions. Magnetic susceptibility can be described by a diluted Heisenberg magnet model developed for semimagnetic semiconductors. High-pressure oxygen annealing induces spin-glass like behavior in Zn$_{1-x}$Mn$_x$O by precipitation of ZnMnO$_3$ in the paramagnetic matrix.

5 pages, 6 figures, RevTeX, To be published in J. Supercond.: Incorp. Novel Materials