Non-Collinear Magnetism due to Orbital Degeneracy and Multipolar Interactions
Non-Collinear Magnetism due to Orbital Degeneracy and Multipolar Interactions
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由于轨道简并性和多极相互作用而产生的非共线磁性
DOI：
10.1143/jpsj.70.1751
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发表时间：
2001
影响因子：
1.7
通讯作者：
Y. Kuramoto
中科院分区：
文献类型：
--
作者：
H. Kusunose;Y. Kuramoto
以CeB 6为靶体系，研究了四极有序下非共线磁性的起源。从金兹伯格-朗道自由能出发，分析了15个多极子之间的模式混合效应。在平均场近似下，导出了低磁转变温度和序参量。在次近邻存在伪偶极型相互作用的情况下，对于某些相互作用参数，观察到的非共线有序模式确实是稳定的。对磁场中III ′相的稳定性也作了解释，指出次近邻八极-八极相互作用的重要性。对于Ce_xLa_（1- x）B_（6）（x ≤ 0.75）中的第Ⅳ相，根据相互作用强度的微小变化，讨论了纯八极有序的可能性。
The origin of non-collinear magnetism under quadrupolar ordering is investigated with CeB 6 taken as a target system. The mode-mixing effect among 15 multipoles is analyzed based on the Ginzburg-Landau free energy. Then the lower magnetic transition temperature and the order parameters are derived within the mean-field approximation. In the presence of pseudo-dipole-type interactions for the next-nearest neighbors, the observed pattern of non-collinear ordering is indeed stabilized for certain set of interaction parameters. The stability of the phase III ′ in the magnetic field is also explained, which points to the importance of the next-nearest-neighbor octupole-octupole interaction. Concerning the phase IV in Ce x La 1- x B 6 with x ∼0.75, a possibility of pure octupole ordering is discussed based on slight modifications of the strength of interactions.