Possibility of a novel pseudoscalar (octupole) order is studied theoretically for orbitally degenerate systems with strong spin-orbit coupling such as CexLa1-xB6. We argue that coexistence of an octupole order parameter and antiferromagnetic fluctuation should lead to marked softening of the elastic constant by a mode-mixing effect. Nonlinear coupling between dipole, quadrupole and octupole fluctuations is taken into account in terms of a Ginzburg-Landau-type functional which is derived microscopically through a path integral.
|ジャーナル||journal of the physical society of japan|
|出版ステータス||Published - 2000 3月|
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