Phys. Rev. B 15, 5310–5316 (1977)Spin-wave theory of the paramagnetic phase boundary in transversally anisotropic antiferromagnetsReceived 6 January 1977; published in the issue dated 1 June 1977 Existent spin-wave theories of antiferromagnets predict the T3/2 behavior of the paramagnetic-spin-flop boundary in the (H, T) plane. This prediction has been confirmed by experiments on NiCl2·6H2O. However in several compounds such dependence has not been observed. This failure is explained as arising from transversally (Jx≠Jy) anisotropic exchange interactions, as in CoCl2·6H2O, or from single-ion orthorhombic anisotropy field, as in MnCl2·4H2O. In both these instances a T2 law is proposed. © 1977 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.15.5310
DOI:
10.1103/PhysRevB.15.5310
PACS:
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