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Adiabatic demagnetizations and calorimetric measurements have been carried out with chromium methylamine alum. The results can be interpreted by a Stark splitting of the 4S ground state of the Cr3+ ion of (0·27 ± 0·01) °K. Absolute temperatures for this salt have been determined down to 0·01° K. The Curie point was found at 0·020° K.
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Gardner et al. (1954) studied this question.
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