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Phenomenological theory of longitudinal spin fluctuations in CsNiCl3

Physical Review B, ISSN: 0163-1829, Vol: 42, Issue: 13, Page: 8783-8786
1990
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The recent observation of longitudinal spin excitations at low temperatures in the spin-1 quasi-one-dimensional antiferromagnet CsNiCl3 is contrary to expectations based on conventional spin-wave theory. Affleck [Phys. Rev. Lett. 62, 474 (1989)] has proposed a field-theory model which attributes this unusual gap-mode fluctuation to quantum effects resulting from the Haldane conjecture. We demonstrate here that the field-theory results are reproduced by a phenomenological Lagrangian formulation of spin waves, in the spirit of Landau and Lifshitz, that has existed in the literature for many years. © 1990 The American Physical Society.

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