Dynamics of composite haldane spin chains in IPA-CuCl3 -: art. no. 047210
Dynamics of composite haldane spin chains in IPA-CuCl3 -: art. no. 047210
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DOI：
10.1103/physrevlett.96.047210
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发表时间：
2006-02-03
影响因子：
8.6
通讯作者：
Qiu, Y
中科院分区：
文献类型：
--
作者：
Masuda, T;Zheludev, A;Qiu, Y
通过冷中子非弹性散射研究了准一维反铁磁体 IPA-CuCl3 中的磁激发。观察到强色散间隙激发。与之前提出的模型相反，该系统最好被描述为不对称量子自旋梯。观察到的光谱根据复合霍尔丹自旋链进行解释。与实际 S=1 链的主要区别在于单磁振子谱在某个临界波矢量处的急剧截止。
Magnetic excitations in the quasi-one-dimensional antiferromagnet IPA-CuCl3 are studied by cold neutron inelastic scattering. Strongly dispersive gap excitations are observed. Contrary to previously proposed models, the system is best described as an asymmetric quantum spin ladder. The observed spectrum is interpreted in terms of composite Haldane spin chains. The key difference from actual S=1 chains is a sharp cutoff of the single-magnon spectrum at a certain critical wave vector.