PHENOMENOLOGICAL THEORY OF LONGITUDINAL SPIN FLUCTUATIONS IN CSNICL3

被引：7
|
作者：
PLUMER, ML [1 ]
CAILLE, A [1 ]
机构：
[1] UNIV SHERBROOKE,DEPT PHYS,SHERBROOKE J1K 2R1,QUEBEC,CANADA
来源：
PHYSICAL REVIEW B | 1990年 / 42卷 / 13期
关键词：
D O I：
10.1103/PhysRevB.42.8783
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页码：8783 / 8786
页数：4
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