Microscopic evidence for a new type of ordering of spin components in a random mixture with competing magnetic anisotropies |
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| Authors: | Atsuko Ito Yoshiko Someya Koichi Katsumata |
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| Institution: | Department of Physics, Faculty of Science, Ochanomizu University, Bunkyo-ku, Tokyo 112, Japan;The Doctoral Research Course in Human Culture, Ochanomizu University, Bunkyo-ku, Tokyo 112, Japan;Research Institute of Applied Electricity, Hokkaido University, Sapporo 060, Japan |
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| Abstract: | The Mössbauer spectroscopy was applied on a random mixture of two kinds of magnetic ions with competing anisotropies, Fe1?xCoxCl2·2H2O. The Mössbauer spectra observed in the Co(Fe)-rich antiferromagnetic (AF) phase near the tetracritical point show that, although the m2(m1) spin component parallel to the easy axis of pure FeCl2·2H2O(CoCl2·2H2O) has no long-range order in this phase (from the neutron diffraction experiment), the m2(m1) spin component contributes to the magnetic hyperfine field at 57Fe nuclei as well as the m1(m2) spin component (which has a long-range order). This fact indicates that the m2(m1) spin components exists in the Co(Fe)-rich AF phase near the tetra-critical point at least in a time scale of ～ 10?8s. This result predicts that the antiferromagnetic ordering in the Co(Fe)-rich AF phase is a new type one. The new phase observed in the intermediate concentration region is demonstrated as the “mixed ordering” phase. |
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