Magnetic phase diagram of Ca_1-xMn_xO

Details Magnetic phase diagram of Ca_1-xMn_xO Magnetic phase diagram of Ca_1-xMn_xO

2002-12-16

arxiv.org/abs/cond-mat/0212378v1

Physics

Condensed Matter

Materials Science

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

Scientific paper

Alternating current susceptibility and direct current magnetization have been studied for polycrystalline Ca$_{1-x}$Mn$_x$O. On increasing the Mn content, magnetic ordering changes from spin-glass behavior for $0.25 \leqslant x \leqslant 0.4$ to antiferromagnetic order. The paramagnetic/antiferromagnetic transition is of second order for $0.5 \leqslant x \leqslant 0.65$ and of first order for $x \geqslant 0.7$. For low Mn concentrations, the high-temperature alternating current susceptibility can be described by a diluted Heisenberg magnet model developed for diluted magnetic semiconductors.

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