Fe2+ localized excitations in the random antiferromagnet with competing spin anisotropies, Fe(1?x)CoxBr2 |
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| Authors: | K Katsumata J Tuchendler |
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| Institution: | Research Institute of Applied Electricity, Hokkaido University, Sapporo 060, Japan;Laboratoire de Dispositifs Infrarouge, Université Paris VI, 4 Place Jussieu, 75230 Paris Cedex 05, France |
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| Abstract: | The Fe2+ localized magnetic excitations observed in the Co-rich antiferromagnetic phase of the randomly mixed system with competing Ising and XY spin anisotropies, Fe(1?x)CoxBr2 have been analyzed quantitatively. The calculated frequency-field diagram reproduces well the experiments. The expectation values of the Fe2+ spin components in the ground state are calculated. It is shown that even in the Co-rich antiferromagnetic phase Fe2+ spins make an angle with the c-plane of the crystal in which Co2+ spins are confined. |
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