Octupole moment as a hidden order parameter in orbitally degenerate f-electron systems

Yoshio Kuramoto; Hiroaki Kusunose

doi:10.1143/JPSJ.69.671

Octupole moment as a hidden order parameter in orbitally degenerate f-electron systems

Yoshio Kuramoto, Hiroaki Kusunose

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

Possibility of a novel pseudoscalar (octupole) order is studied theoretically for orbitally degenerate systems with strong spin-orbit coupling such as Ce_xLa_1-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.

Original language	English
Pages (from-to)	671-674
Number of pages	4
Journal	journal of the physical society of japan
Volume	69
Issue number	3
DOIs	https://doi.org/10.1143/JPSJ.69.671
Publication status	Published - 2000 Mar
Externally published	Yes

Keywords

CeLaB
Elastic constant
Multipole
Octupole moment
Orbital degeneracy
Time reversal
Ultrasound

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.69.671

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abstract = "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.",

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author = "Yoshio Kuramoto and Hiroaki Kusunose",

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AU - Kusunose, Hiroaki

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AB - 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.

KW - CeLaB

KW - Elastic constant

KW - Multipole

KW - Octupole moment

KW - Orbital degeneracy

KW - Time reversal

KW - Ultrasound

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ER -

Octupole moment as a hidden order parameter in orbitally degenerate f-electron systems

Abstract

Keywords

ASJC Scopus subject areas

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