Magnetic dimer excitations in cesium chlorochromate (Cs3Cr2Cl9) studied by neutron scattering
Magnetic dimer excitations in cesium chlorochromate (Cs3Cr2Cl9) studied by neutron scattering
复制标题
通过中子散射研究氯铬酸铯 (Cs3Cr2Cl9) 中的磁性二聚体激发
DOI：
10.1021/ic00201a015
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发表时间：
1985
影响因子：
4.6
通讯作者：
L. Brillouin
中科院分区：
文献类型：
--
作者：
B. Leuenberger;H. Güdel;J. Kjems;D. Petitgrand;L. Brillouin
用非弹性中子散射（INS）研究了Cs_3Cr_2Cl_9中单重态-三重态二聚体激发的能量色散。在无规相位近似下，用完全各向同性的海森堡哈密顿量可以解释这些结果。只需要考虑最近邻的相互作用。从极好的拟合中，获得了三个交换参数：J=-1.75 meV（内二聚体），J. 0.032 meV（二聚体间，亚晶格内）和Jc=-0.031 meV（二聚体间，亚晶格间）。这些值表明Cs_3Cr_2Cl_9远没有磁性有序化。讨论了Br和I取代Cl时交换参数的系统变化。
The energy dispersion of the singlet-triplet dimer excitationin Cs3Cr2Cl9has been studied by inelastic neutron scattering (INS) at temperatures down to 1.3 K. The results can beaccounted for by using a completely isotropic Heisenberg Hamiltonian in the random phase approximation (RPA). Only nearest-neighbor interactions need to be considered. From the excellent fit, three exchange parameters were obtained: J=-1.75 meV (intradimer), J.=-0.032 meV (interdimer, intrasublattice) and Jc=-0.031 meV (interdimer, intersublattice). These values indicate that Cs3Cr2Cl9 is far from ordering magnetically. Thesystematic variation of the exchange parameters on substitution of Cl by Br and I is discussed.