Spin dynamics of the quasi-two-dimensional spin- 1 2 quantum magnet Cs 2 CuCl 4
Spin dynamics of the quasi-two-dimensional spin- 1 2 quantum magnet Cs 2 CuCl 4
复制标题
准二维自旋 1 2 量子磁体 Cs 2 CuCl 4 的自旋动力学
DOI:
10.1103/physrevb.72.134429
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发表时间:
2005
影响因子:
3.7
通讯作者:
F. Essler
中科院分区:
文献类型:
--
作者:
M. Veillette;A. James;F. Essler
We study dynamical properties of the anisotropic triangular quantum antiferromagnet ${\mathrm{Cs}}_{2}{\mathrm{CuCl}}_{4}$. Inelastic neutron scattering measurements have established that the dynamical spin correlations cannot be understood within a linear spin wave analysis. We go beyond linear spin wave theory by taking interactions between magnons into account in a $1∕S$ expansion. We determine the dynamical structure factor and carry out extensive comparisons with experimental data. We find that compared to linear spin wave theory, a significant fraction of the scattering intensity is shifted to higher energies and strong scattering continua are present. However, the $1∕S$ expansion fails to account for the experimentally observed large quantum renormalization of the exchange energies.
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
福井浩紀;藤堂眞治;S. Todo;A. Shibasaki and S. Todo
通讯作者:
A. Shibasaki and S. Todo