Abstract
The Yb 1− x Y x InCu 4 system with 0 ⩽ x ⩽ 1, which forms the C15b crystal structure, was studied with the Cu nuclear quadrupole resonance (NQR) technique, in order to investigate the valence transition in YbInCu 4 and 4f electron spin dynamics in the diluted system. With increasing x, the valence transition temperature T v decreases markedly and NQR frequency v Q at low temperatures is sensitively affected. An analysis of the nuclear spin-lattice relaxation time, T 1 suggests that the stability of the low temperature (Fermi liquid) state is intimately related to the intersite coherence between 4f electrons.
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