Analysis of f-p model for octupole ordering in NpO2

Abstract

In order to examine the origin of octupole ordering in NpO2, we propose a microscopic model constituted of neptunium 5f and oxygen 2p orbitals. To study multipole ordering, we derive effective multipole interactions from the f-p model by using the fourth-order perturbation theory in terms of p-f hopping integrals. Analyzing the effective model numerically, we find a tendency toward Γ_{5u} antiferro-octupole ordering.

arXiv comment4 pages, 3 figures

References in corpus (5)

• Triple-q octupolar ordering in NpO_2
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• Microscopic theory of multipole ordering in NpO2
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• Multipole Susceptibility of Multiorbital Anderson Model Coupled with Jahn-Teller Phonons
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• Multipole as $f$-Electron Spin-Charge Density in Filled Skutterudites
• Nematic and time-reversal breaking superconductivities coexisting with quadrupole order in a ${\Gamma }_3$ system
• Multipole correlations in low-dimensional f-electron systems
• Quadrupole Susceptibility of Gd-Based Filled Skutterudite Compounds
• Key role of hybridization between actinide 5f and oxygen 2p orbitals for electronic structure of actinide dioxides
• 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