Origin of spin-glass behavior of Zn_1-xMn_xO

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