Abstract
The valence fluctuation between 4f 12 and 4f 13 of Tm monochalcogenides (TmX; X=Te, Se, S) has been found to play a dominant role in their unusual physical properties. We report here the pressure dependence of the electrical resistivity in TmX obtained up to 8 GPa. The temperature-dependent resistivity of TmTe with increasing pressure becomes to show just like that of TmSe at ambient pressure, implying that the application of pressure not only increases the valence but also suppresses the ferromagnetic exchange interaction in this system. We obtained a unified magnetic phase diagram as a function of lattice constant for all of TmX. These results indicate that the magnetic exchange interaction in TmX changes from ferromagnetic to antiferromagnetic with decreasing lattice constant.
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