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VOLUME 58 (1993) | ISSUE 6 | PAGE 424
Dynamics of degenerate local excitations in cubic metals
The problem of an isolated ion with a total angular momentum / in a cubic metal is analyzed by the technique of Abrikosov pseudofermions. A system of generalized kinetic equations is constructed. The particular example /=5/2 is studied in the case in which the ground state is the quartet Г8 (CeB6). The central peak in the susceptibility can be described by a sum of two Lorentzians, one of which is narrower and higher than the other. This multimode behavior is shown to be a general phenomenon when a degenerate multiplet is not a doublet and does not constitute all the states of the system.