YbInCu4 exhibits a first-order valence transition at H v ≈ 33 T with 0.45% decrease of volume as increasing the magnetic field. The inherent chemical pressure in Yb1-xYxInCu 4 system is discussed as negative on valence transition of YbInCu4. The external pressure effect on Hv of Yb 1-xYxInCu4 is measured as dHv/dP ≈ - 1 T kbar-1.
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