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Understanding the energy scales relevant for the valence transition in YbInCu4

We report measurements and data analysis of specific heat, susceptibility, and transport properties of Yb0.5Y0.5InCu4 in the temperature range between 2 and 300 K, and in magnetic fields of 0 and 5 T. The data can be consistently explained within the local-moment crystal-field theory with two close-lying doublets, Γ 6 and Γ 7, in the ground state and a Γ 8 excited quartet, and with very weak or even absent Kondo effect. The crystal-field scheme proposed by this work, which differs from the one widely accepted in the literature, provides a better understanding of the relevant energy scales and the valence transition in the YbInCu4.

copper alloys ; crystal field interactions ; ground states ; indium alloys ; Kondo effect ; magnetic susceptibility ; specific heat ; ytterbium alloys ; yttrium alloys

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