Octupole Moment as a Hidden Order Parameter in Orbitally Degenerate
f-Electron Systems
release_7kjao73qy5ha3kv3raurhgkjre
by
Yoshio Kuramoto,
Hiroaki Kusunose
2000
Abstract
Possibility of a novel pseudo-scalar (octupole) order is studied
theoretically for orbitally degenerate systems with strong spin-orbit coupling
such as Ce_xLa_1-xB_6. It is discussed that coexistence of an octupole
order parameter and antiferromagnetic fluctuation should lead to drastic
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 path integral.
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