We have calculated the spin wave spectra and from these the specific heats of CNAF and UUDD solid 3He at low temperatures. We compare with experiment and find good agreement even though we also find major deviations from simple T3 behavior. The calculation included the six-spin exchange terms now recognized to be important for quantitative calculations. The inclusion of these terms was made more tractable by application of an algebraic technique from nuclear theory (Random Phase Approximation) for execution of the spin wave calculation, which nevertheless involved lengthy analysis.
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Sun, Z., Hetherington, J.H. Heat Capacity of Low Temperature Solid 3He. J Low Temp Phys 91, 299–313 (1993). https://doi.org/10.1007/BF00125427
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DOI: https://doi.org/10.1007/BF00125427