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arXiv · 0705.2592

Incoherent non-Fermi liquid scattering in a Kondo lattice

Johnpierre Paglione·T. A. Sayles·P. -C. Ho·J. R. Jeffries·M. B. Maple
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Abstract

One of the most notorious non-Fermi liquid properties of both archetypal heavy-fermion systems [1-4] and the high-Tc copper oxide superconductors [5] is an electrical resistivity that evolves linearly with temperature, T. In the heavy-fermion superconductor CeCoIn5 [5], this linear behaviour was one of the first indications of the presence of a zero-temperature instability, or quantum critical point. Here, we report the observation of a unique control parameter of T-linear scattering in CeCoIn5, found through systematic chemical substitutions of both magnetic and non-magnetic rare-earth, R, ions into the Ce sub-lattice. We find that the evolution of inelastic scattering in Ce1-xRxCoIn5 is strongly dependent on the f-electron configuration of the R ion, whereas two other key properties -- Cooper-pair breaking and Kondo-lattice coherence -- are not. Thus, T-linear resistivity in CeCoIn5 is intimately related to the nature of incoherent scattering centers in the Kondo lattice, which provides insight into the anomalous scattering rate synonymous with quantum criticality [7].

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Johnpierre Paglione, T. A. Sayles, P. -C. Ho, J. R. Jeffries, M. B. Maple. 2008-03-18. Incoherent non-Fermi liquid scattering in a Kondo lattice. https://doi.org/10.1038/nphys711

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