NMR study of prssure-induced magnetic transition in EuSe |
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Authors: | K Hiraoka T Hihara K Kojima T Kino |
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Institution: | Faculty of Science, Hiroshima University, Hiroshima 730, Japan |
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Abstract: | The zero-field 153Eu NMR in EuSe has been observed as a function of the pressure up to 14 kbar in the temperature range between 1.7 and 4.2 K. A sequent magnetic phase transition of NSNS-NNS-NNSS-NNN occurs with pressure at 1.7 K. In the NNSS state (2.0 ? P ? 4.8 kbar) the NMR frequency v is insensitive to the pressure. In the ferromagnetic state (P ? 4.8 kbar) v depends remarkably on the pressure, and the exchange interaction between the nearest Eu neighbours J1 is shown to increase rapidly with decreasing the Eu-Eu distance. The pressure dependences of the Eu hyperfine field suggest that the magnetic moment of a Eu2+ ion in the ferromagnetic state under pressure is smaller than the ideal saturation value at 0 K. |
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