Non-Collinear Magnetism due to Orbital Degeneracy and Multipolar Interactions : Condensed Matter: Electronic Properties, etc.
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概要
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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 111' 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_xLa_<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.
- 社団法人日本物理学会の論文
- 2001-06-15
著者
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Kuramoto Yoshio
Department Of Applied Physics Tohoku University
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Kusunose Hiroaki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kuramoto Yoshio
Department Of Applied Physics Faculty Of Engineering Tohoku University
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