paper

Magnetic behaviour of quasi-one-dimensional oxides, CaCoMnO

arXiv:cond-mat/0306426 · doi:10.1016/S0038-1098(03)00618-5

Abstract

The results of ac and dc magnetization and heat capacity measurements on the oxides, CaCoMnO, forming in a KCdCl-derived rhombohedral quasi-one-dimensional crystal structure, are reported. As far as CaCoO is concerned, the results reveal truly complex nature of the two magnetic transitions, identified to set in at 24 and 12 K in the previous literature. However, partial replacement of Co by Mn apparently results in a long magnetic ordering of an antiferromagnetic type (below 13 and 18 K for x= 0.0 and 0.25 respectively), instead of spin-glass freezing in spite of the fact that there is Co-Mn disorder; in addition, interestingly there are hysteretic spin reorientation effects as revealed by isothermal magnetization behavior.

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