The mixed-valent compound TmSe has been studied in its antiferromagnetic state (TTN=3.2) by resonant magnetic x-ray scattering. The (003) magnetic reflection shows two peaks as a function of incident energy corresponding to the LIII absorption edges of its Tm²⁺ and Tm³⁺ configurations. This unambiguously establishes that long-range magnetic order is present for both valence states. An Anderson impurity model including multiplet and core-hole effects gives a good description of the data.
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McWhan et al. (1993) studied this question.
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