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Phys. Rev. Lett. 35, 1442 (1975) - Two-, Three-, and Four-Atom Exchange Effects in bcc $^{3}\mathrm{He}$ https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.35.1442
Physical Review LettersTwo-, Three-, and Four-Atom Exchange Effects in bcc $^{3}\mathrm{He}$We have made mean-field calculations with a Hamiltonian obtained from two-, three-, and four-atom exchange in bcc solid $^{3}\mathrm{He}$. We are able to fit the high-temperature experiments as well as the phase diagram of Kummer et al. at low temperatures. We find two kinds of antiferromagnetic phases as suggested by Kummer's experiments.