μSR and NMR in f-electron non-Fermi liquid materials

D. E. MacLaughlin*, M. S. Rose, Ben-Li Young, O. O. Bernal, R. H. Heffner, G. D. Morris, K. Ishida, G. J. Nieuwenhuys, J. E. Sonier

*Corresponding author for this work

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10 Scopus citations

Abstract

Magnetic resonance (μSR 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 μSR 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(Ru0.5 Rh0.5)2Si2, CeNi2Ge2, and YbRh2Si2 the low-frequency weight of the spin fluctuation spectrum is much weaker than in the disordered NFL systems.

Original languageEnglish
Pages (from-to)381-386
Number of pages6
JournalPhysica B: Condensed Matter
Volume326
Issue number1-4
DOIs
StatePublished - 1 Feb 2003

Keywords

  • CePtSiGe
  • Disorder-driven mechanisms
  • Non-Fermi liquids
  • Quantum critical points

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    MacLaughlin, D. E., Rose, M. S., Young, B-L., Bernal, O. O., Heffner, R. H., Morris, G. D., Ishida, K., Nieuwenhuys, G. J., & Sonier, J. E. (2003). μSR and NMR in f-electron non-Fermi liquid materials. Physica B: Condensed Matter, 326(1-4), 381-386. https://doi.org/10.1016/S0921-4526(02)01637-X