Octupole Moment as a Hidden Order Parameter in Orbitally Degenerate f-Electron Systems

Abstract

Possibility of a novel pseudo-scalar (octupole) order is studied theoretically for orbitally degenerate systems with strong spin-orbit coupling such as Ce${}_x$La${}_{1-x}$B${}_6$. 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.

4 pages, 1 figure, to be published in J.Phys.Soc.Jpn

References in corpus (3)

• Fluctuation Effects on the Quadrupolar Ordering in Magnetic Field
• Dynamical Effective Medium Theory for Quantum Spins and Multipoles
• Orbital Kondo Effect in Ce${}_x$La${}_{1-x}$B${}_6$: Scaling Analysis

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