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
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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
期刊:
影响因子:
3.7
通讯作者:
F. Essler
F. Essler
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Veillette;A. James;F. Essler

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我们研究了各向异性三角量子反铁磁体${\mathrm{Cs}}_{2}{\mathrm{CuCl}}_{4}$的动力学性质。非弹性中子散射测量已经确定,在线性自旋波分析中不能理解动态自旋相关。我们超越线性自旋波理论,考虑到磁振子之间的相互作用,在1 scinS $扩展。我们确定的动力学结构因子,并进行了广泛的比较与实验数据。我们发现,与线性自旋波理论相比,散射强度的一个显着的分数被转移到更高的能量和强散射连续存在。然而,1 scinS $膨胀未能占实验观察到的大量子重整化的交换能量。
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.
准一维随机海森堡反铁磁体的尼尔温度
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