Abstract
The magnetization and low temperature specific heat of small (20 mg) single crystals of Sm2S3, Sm3S4 and Sm3Se4 have been measured to test the crystal field model for Sm3+ in the Th3P4 structure suggested earlier for the compounds EuSm2S4 and SrSm2S4. In this model, the Γ8 quartet is lowest but split (by ∼2.4 K) by a small noncubic crystal field. A pronounced upturn in the specific heat below 7 K is predicted. The present measurements down to 1.5 K confirm this prediction for every compound measured, the same feature occurring at almost precisely the same temperature. In addition, a comparison of the experimental susceptibilities of Sm2S3 and Sm3S4 indicates that simple addition of the contributions of the different ionic species (Sm2+ and Sm3+) is sufficient to explain the magnetic behavior of these mixed valent Sm compounds.
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