muSR and NMR in f-electron non-Fermi liquid materials
Abstract
Magnetic resonance (muSR and NMR) studies of f-electron non-Fermi-liquid (NFL) materials give clear evidence that structural disorder is a major factor in NFL behavior. Longitudinal-field muSR relaxation measurements at low fields reveal a wide distribution of muon relaxation rates and divergences in the frequency dependence of spin correlation functions in the NFL systems UCu5-xPdx and CePtSi1-xGex. These divergences seem to be due to slow dynamics associated with quantum spin-glass behavior, rather than quantum criticality as in a uniform system, for two reasons: the observed strong inhomogeneity in the muon relaxation rate, and the strong and frequency-dependent low-frequency fluctuation observed in U(Cu,Pd)5 and CePt(Si,Ge). In the NFL materials CeCu5.9Au0.1, Ce(Ru0.5Rh0.5)2Si2, CeNi2Ge2, and YbRh2Si2 the low-frequency weight of the spin fluctuation spectrum is much weaker than in the disordered NFL systems.
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