Multipole Ordering and Fluctuations in f-Electron Systems

Abstract

We investigate effects of multipole moments in f-electron systems both from phenomenological and microscopic viewpoints. First, we discuss significant effects of octupole moment on the magnetic susceptibility in a paramagnetic phase. It is found that even within mean-field approximation, the magnetic susceptibility deviates from the Curie-Weiss law due to interactions between dipole and octupole moments. Next, we proceed to a microscopic theory for multipole ordering on the basis of a j-j coupling scheme. After brief explanation of a method to derive multipole interactions from the $f$-electron model, we discuss several multipole ordered phases depending on lattice structure. Finally, we show our new development of the microscopic approach to the evaluation of multipole response functions. We apply fluctuation exchange approximation to the f-electron model, and evaluate multipole response functions.

7 pages, 4 figures, Proceedings of ASR-WYP-2005

References in corpus (8)

• Quadrupolar effect and rattling motion in heavy fermion superconductor PrOs_4Sb_{12}
• Direct Observation of Quadrupolar Excitons in the Heavy-Fermion Superconductor PrOs${}_4$Sb${}_{12}$
• Microscopic theory of multipole ordering in NpO2
• Evidence for Octupole Order in Ce${}_{0.7}$La${}_{0.3}$B${}_6$ from Resonant X-ray Scattering
• Invariant Form of Hyperfine Interaction with Multipolar Moments - Observation of Octupolar Moments in NpO${}_2$ and CeB${}_6$ by NMR -
• Analysis of f-p model for octupole ordering in NpO2
• Multipole ordering in f-electron systems on the basis of a j-j coupling scheme
• Magnetic Susceptibility of Multiorbital Systems

Cited by in corpus (6)

• Effective Crystalline Electric Field Potential in a j-j Coupling Scheme
• Untangling the structural, magnetic dipole, and charge multipolar orders in Ba${}_2$MgReO${}_6$
• Multipole Susceptibility of Multiorbital Anderson Model Coupled with Jahn-Teller Phonons
• Anisotropic Superconductivity Emerging from the Orbital Degrees of Freedom in a ${\Gamma }_3$ Non-Kramers Doublet System
• Octupolar edge state in an $e_g$ orbital system on a square lattice
• Flat Surface State with Octupole Moment in an $e_g$ Orbital System on a Simple Cubic Lattice