Kondo disorder and non-Fermi-liquid behavior in UCu{sub 5{minus}{ital x}}Pd{sub {ital x}} and CeCu{sub 5.9}Au{sub 0.1}
- Department of Physics, University of California, Riverside, California 92521-0413 (United States)
- Institute for Particle Physics, Eidgenoessiche Technische Hochschule-Zuerich, CH-5232 Villigen PSI (Switzerland)
- Mail Stop K764, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Kamerlingh Onnes Laboratorium, Rijksuniversiteit Leiden, 2300 RA Leiden (The Netherlands)
- Department of Physics, University of Florida, Gainesville, Florida 32611 (United States)
- Physikalisches Institut, Universitaet Karlsruhe, D-76128 Karlsruhe (Germany)
- Laboratorium fuer Festkoerperphysik, Eidgenoessiche Technische Hochschule-Hoenggerberg, CH-8903 Zuerich (Switzerland)
Muon spin rotation ({mu}SR) has been used to probe non-Fermi-liquid (NFL) behavior in the heavy-fermion alloys UCu{sub 5{minus}{ital x}}Pd{sub {ital x}}, {ital x}=1.0 and 1.5, and CeCu{sub 5.9}Au{sub 0.1}. Zero-field {mu}SR puts an upper bound of {approximately}0.01{mu}{sub {ital B}}/{ital U} atom on any static magnetism in UCu{sub 5{minus}{ital x}}Pd{sub {ital x}}, which is too weak to affect the transverse-field {mu}SR linewidth or to give rise to NFL behavior. In agreement with NMR results, {mu}SR spectra in transverse fields suggest that a broad distribution of Kondo temperatures ({open_quote}{open_quote}Kondo disorder{close_quote}{close_quote}) is important in UCu{sub 5{minus}{ital x}}Pd{sub {ital x}}. NFL anomalies at temperature {ital T} then arise from {open_quote}{open_quote}free{close_quote}{close_quote} spins for which {ital T}{sub {ital K}}{lt}{ital T}. Comparison of {mu}SR and NMR linewidths also indicates short-range spatial correlation of the Kondo disorder in UCu{sub 5{minus}{ital x}}Pd{sub {ital x}}, in agreement with the local character of the dynamic susceptibility inferred from neutron scattering experiments. In CeCu{sub 5.9}Au{sub 0.1} the data suggest significant Kondo disorder only if the spatial correlation is long ranged, which is not indicated by other properties of this alloy. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 389321
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 18; Other Information: PBD: Nov 1996
- Country of Publication:
- United States
- Language:
- English
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