Magnetic heat capacity gadolinium

Finally, it appears that Cm for gadolinium does not follow one simple temperature dependence if we allow Cm T" then theoretically (Sedaghat and Cracknell 1971, Stevens and Krukewich 1973) n varies from 1.5 at low temperatures to 2.3 above 10 K. The above theoretical calculations are based on experimentally determined magnon dispersion relations. Lounasmaa and Sund-strom (1966) tentatively proposed n 2.7 from analysis of heat capacity results. Wells et al. (1974), on the other hand, are able with more confidence to propose n 1.75, and that if magnetic anisotropy were allowed then the introduced energy gap Eg will be very small, in the region of 0.05 K. If there were no anisotropy at all, then a behaviour would have been expected, as gadolinium, with L = 0, is a special case (see e.g. Lounasmaa and Sundstrom 1966). 

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