Anderson lattice behavior in Yb1xLuxAl3

E. D. Bauer, C. H. Booth, J. M. Lawrence, M. F. Hundley, J. L. Sarrao, J. D. Thompson, P. S. Riseborough, and T. Ebihara
Phys. Rev. B 69, 125102 – Published 12 March 2004
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Abstract

Measurements of magnetic susceptibility χ(T), specific heat C(T), Hall coefficient RH(T), and Yb valence ν=2+nf [f-occupation number nf(T) determined from Yb LIII x-ray absorption measurements] were carried out on single crystals of Yb1xLuxAl3. The low-temperature anomalies observed in χ(T) and C(T) corresponding to an energy scale Tcoh40K in the intermediate valence, Kondo lattice compound YbAl3 are suppressed by Lu concentrations as small as 5% suggesting these low-T anomalies are extremely sensitive to disorder and, therefore, are a true coherence effect. By comparing the temperature dependence of various physical quantities to the predictions of the Anderson impurity model, the slow crossover behavior observed in YbAl3, in which the data evolve from a low-temperature coherent, Fermi-liquid regime to a high-temperature local moment regime more gradually than predicted by the Anderson impurity model, appears to evolve to fast crossover behavior at x0.7 where the evolution is more rapid than predicted. These two phenomena found in Yb1xLuxAl3, i.e., the low-T anomalies and the slow/fast crossover behavior are discussed in relation to recent theories of the Anderson lattice.

  • Received 6 October 2003

DOI:https://doi.org/10.1103/PhysRevB.69.125102

©2004 American Physical Society

Authors & Affiliations

E. D. Bauer1, C. H. Booth2, J. M. Lawrence3, M. F. Hundley1, J. L. Sarrao1, J. D. Thompson1, P. S. Riseborough4, and T. Ebihara5

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3University of California, Irvine, California 92697, USA
  • 4Temple University, Philadelphia, Pennsylvania 19122, USA
  • 5Shizuoka University, Shizuoka 422-8529, Japan

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Vol. 69, Iss. 12 — 15 March 2004

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