Abstract
Abstract We have performed 63 Cu NQR measurement to investigate the pressure effect on the electronic state of YbInCu 4 . Applying pressure lowers the valence transition temperature T v and stabilizes the localized electron state. For the pressure above 2.4 GPa, in the pressure-stabilized localized electron state, 1/ T 1 shows near temperature-independent behavior and exhibits a divergent increase at 2.4 K due to the critical slowing down of magnetic moment fluctuations. These results suggest that the localized electron state of YbInCu 4 directly transforms into the magnetically ordered state without taking any intermediate heavy-Fermion or superconducting states.
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