Crossover from Valence Phase Transition to Kondo Behavior in Yb1-xCexInCu4 as Probed by Cu NQR
Influence of cerium substitution on the valence phase transition in Yb1-xCexInCu4 system (x = 0, 0.04, 0.08, 0.12 and 0.16) has been studied by means of 63Cu NQR. Discontinuous change in Cu NQR frequency was detected around valence transition temperature Tv in YbInCu4, Yb0.96Ce0.04InCu4 and Yb0.92Ce0.08InCu4. In the vicinity of Ce concentration x = 0.08 a crossover from the 1-st order valence phase transition to gradual change of electronic and magnetic properties of Yb1-xCexInCu4 system is observed.
A.A. Gippius et al., "Crossover from Valence Phase Transition to Kondo Behavior in Yb1-xCexInCu4 as Probed by Cu NQR", Solid State Phenomena, Vols. 152-153, pp. 419-423, 2009