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Open Access Publications from the University of California

Evolution from first-order valence transition to heavy-fermion behavior

  • Author(s): Sarrao, J
  • Immer, C
  • Benton, C
  • Fisk, Z
  • Lawrence, J
  • et al.

(Formula presented) undergoes a first-order isostructural valence transition near 40 K, whereas (Formula presented) is a moderately heavy (γ=250 mJ/mol (Formula presented)) mixed-valence compound. We have succeeded in growing single crystals of these compounds, as well as many intermediate alloys, using flux-growth techniques. The evolution from (Formula presented) to (Formula presented) has been characterized using electrical resistivity, magnetic susceptibility, and x-ray powder diffraction. The data are interpreted in terms of the evolution of the single-impurity Kondo temperature as a function of Ag concentration. © 1996 The American Physical Society.

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