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We report on the magnetic properties of the Cr-based diluted magnetic semiconductors Zn_1-x{Cr}ₓ$Se and ${Zn}_{1{{-}}x}CrₓS (x0.01). The specific heat was measured in the temperature range 1.5T10 K and in magnetic fields up to 3 T, while the magnetization was measured at 2T40 K and B6 T. The magnetic behavior is neither that of Brillouin paramagnets [Mn, Co diluted magnetic semiconductors (DMS's)] nor of Van Vleck systems (Fe DMS's). It results from a strong, static Jahn-Teller (JT) distortion for the Cr ions. A simple crystal-field model, which includes the JT effect, provides an overall description of the experimental data, but some discrepancies remain.
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Mac et al. (1994) studied this question.
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