Field-induced gap in S = 1/2 antiferromagnetic chains
Field-induced gap in S = 1/2 antiferromagnetic chains
复制标题
DOI：
10.1103/physrevlett.79.2883
复制
发表时间：
1997-10-13
影响因子：
8.6
通讯作者：
Affleck, I
中科院分区：
文献类型：
--
作者：
Oshikawa, M;Affleck, I
在最近对准一维 S = 1/2 反铁磁体苯甲酸铜进行的中子散射实验中，通过施加磁场感应出间隙。我们认为，由于交替的 g 张量和 Dzyaloshinskii-Moriya 相互作用，间隙形成的主要机制是有效的交错场。我们解释了间隙对施加场的依赖性，并识别了结构因子 S(q, omega) 中的几个峰值。
In a recent neutron-scattering experiment on the quasi-one-dimensional S = 1/2 antiferromagnet Cu benzoate, a gap was induced by an applied magnetic field. We argue that the primary mechanism of the gap formation is an effective staggered field due to both the alternating g-tensor and the Dzyaloshinskii-Moriya interaction. We explain the dependence of the gap on the applied field, as well as identify several peaks in the structure factor S(q, omega).