Crystal Field Triplets: A New Route to Non-Fermi-Liquid Physics

Mikito Koga; Gergely Zaránd; Daniel L. Cox

doi:10.1103/PhysRevLett.83.2421

Crystal Field Triplets: A New Route to Non-Fermi-Liquid Physics

Mikito Koga, Gergely Zaránd, and Daniel L. Cox

Phys. Rev. Lett. 83, 2421 – Published 20 September 1999

Abstract

A model for crystal field triplet ground states of rare earth or actinide ions with dipolar and quadrupolar couplings to conduction electrons is studied for the first time with renormalization group methods. The quadrupolar coupling leads to a new nontrivial, non-Fermi-liquid fixed point, which survives in an intermediate valence Anderson model. The calculated magnetic susceptibility displays one parameter scaling, going as $T^{- α}$ ( $α \approx 0.4$ ) at intermediate temperatures, reminiscent of the non-Fermi-liquid alloy $UCu_{5 - x} Pd_{x}$ .

Received 22 March 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.2421

Authors & Affiliations

Mikito Koga¹, Gergely Zaránd^1,2, and Daniel L. Cox¹

¹Department of Physics, University of California, Davis, California 95616
²Research Group of the Hungarian Academy of Sciences, Institute of Physics, TU Budapest, H-1521, Hungary