A review is presented of µSR measurements on CeB 6 , Ce 1− x La x B 6 , CeAg, PrCu 2 , HoB 2 C 2 , DyPd 3 S 4 and UPd 3 which reveal multipolar, in particular quadrupolar, effects. μ + Knight shift data imply that the spin polarization of conduction electrons at the μ + may acquire an unusual temperature dependence and anisotropy in the presence of a non-spherical charge distribution of the f-electrons. This feature is also discussed theoretically. The interplay of dipolar magnetic and electric quadrupolar order is shown to possibly explain properties of the spontaneous fields at the μ + in the magnetically ordered state, as well as aspects of the μ + spin lattice relaxation. The possibility of magnetic-octupolar effects is briefly considered.
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Schenck et al. (2004) studied this question.
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