Multipole ordering in f-electron systems
Abstract
In order to investigate multipole ordering in f-electron systems from a microscopic viewpoint, we study the so-called 8 models on three kinds of lattices, simple cubic (sc), bcc, and fcc, based on a j-j coupling scheme with f-electron hopping integrals through (ffσ) bonding. From the 8 model, we derive an effective model for each lattice structure by using the second-order perturbation theory with respect to (ffσ). By further applying mean-field theory to the effective model, we find a 3g antiferro-quadrupole transition for the sc lattice, a 2u antiferro-octupole transition for the bcc lattice, and a longitudinal triple-q 5u octupole transition for the fcc lattice.
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