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The mixed-valence (MV) compound YbInCu4 was investigated by electricalresistivity and ac specific heat at low temperatures and high pressures. Atatmospheric pressure, its Kadowaki-Woods (KW) ratio, A/\gamma ^2, is 16 timessmaller than the universal value R_{KW}(=1.0 x 10^-5 \mu \Omega cm mol^2 K^2mJ^-2), but sharply increases to 16.5R_{KW} at 27 kbar. The pressure-inducedchange in the KW ratio and deviation from R_{KW} are analyzed in terms of thechange in f-orbital degeneracy N and carrier density n. This analysis isfurther supported by a dramatic change in residual resistivity \rho_0 near 25kbar, where \rho_0 jumps by a factor of 7.Comment: 4pages, 3figure

physical review letters

Anomalous Pressure Dependence of the Kadowaki-Woods Ratio and Crystal-Field Effects in Mixed-Valence<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>YbInCu</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>

Anomalous Pressure Dependence of the Kadowaki-Woods Ratio and Crystal-Field Effects in Mixed-ValenceYbInCu4