Spin structure factor of the frustrated quantum magnet Cs 2 CuCl 4
Spin structure factor of the frustrated quantum magnet Cs 2 CuCl 4
复制标题
受挫量子磁体Cs 2 CuCl 4 的自旋结构因子
DOI：
10.1103/physrevb.73.184403
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
C. Kallin
中科院分区：
文献类型：
--
作者：
D. Dalidovich;R. Sknepnek;A. J. Berlinsky;Junhua Zhang;C. Kallin
研究了最近邻交换耦合具有单向各向异性、弱Dzyaloshinskiii-Moriya（DM）相互作用的三角晶格上二维反铁磁体的基态性质和中子结构因子.该哈密顿量已被用来解释自旋1 scin 2螺旋自旋密度波系统${\mathrm{Cs}}_{2}{\mathrm{CuCl}}_{4}$ [R. Coldea等人，Phys. Rev. B 68，134424（2003）]。计算使用1 scinS $展开，考虑到自旋波之间的相互作用。基态能量、有序波矢量的位移$\mathbf{Q}$和局部磁化强度都计算为1 scin {S}^{2}$。的中子结构因子，使用非谐自旋波绿色的功能，以订购$1 scinS $，被证明是在合理的协议与公布的中子数据，提供略有不同的参数被用于交换和DM相互作用比那些推断在高磁场中的测量。
The ground state properties and neutron structure factor for the two-dimensional antiferromagnet on the triangular lattice, with unidirectional anisotropy in the nearest-neighbor exchange couplings and a weak Dzyaloshinskii-Moriya (DM) interaction, are studied. This Hamiltonian has been used to interpret neutron scattering measurements on the spin $1∕2$ spiral spin-density-wave system, ${\mathrm{Cs}}_{2}{\mathrm{CuCl}}_{4}$ [R. Coldea et al., Phys. Rev. B 68, 134424 (2003)]. Calculations are performed using a $1∕S$ expansion, taking into account interactions between spin waves. The ground state energy, the shift of the ordering wave vector, $\mathbf{Q}$, and the local magnetization are all calculated to order $1∕{S}^{2}$. The neutron structure factor, obtained using anharmonic spin-wave Green's functions to order $1∕S$, is shown to be in reasonable agreement with published neutron data, provided that slightly different parameters are used for the exchange and DM interactions than those inferred from measurements in high magnetic field.