Measurements of the pressure versus temperature for constant-volume samples of solid He³ to 20 mdeg K show the expected T^-1 dependence due to spin ordering at low temperatures. A value for the exchange integral |J|/k of about 0.7 mdeg K is obtained for a molar volume of 24 cm³, with ∂ln|J|∂lnV=16.4.
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Panczyk et al. (1967) studied this question.
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