Abstract We performed ultrasonic measurements on a quaternary cubic compound PrRuInZn to explore the ground state properties derived from non-Kramers doublet of Pr. PrRuInZn is a quaternary derivative of the ternary compound PrRuZn that exhibits a structural phase transition at K. In PrRuInZn, the Zn atoms at the 16 site in PrRuZn are selectively replaced by In atoms. A monotonic increase was observed in the temperature dependence of elastic constants and in the temperature range around to which an elastic softening was observed in for PrRuZn. The disappearance of the softening indicates that the structural transition in PrRuZn is suppressed by the substitution of Zn ions by In ones with a larger ionic radius. Alternatively, the of PrRuInZn exhibits a precursor Curie-type elastic softening toward low temperatures being responsible for the non-Kramers ground state. We discuss the ground state and the evolution of the elastic properties of the different single-crystal samples of PrRuInZn grown under different conditions.
Fund: Project supported by the Soft-Path Science and Engineering Research Center (SPERC), Iwate University, and the JSPS KAKENHI (Grant Nos. JP18K03530, JP21K04622, and JP21K13869).
Hua-Yuan Zhang(张化远), Kazuhei Wakiya, Mitsuteru Nakamura, Masahito Yoshizawa, and Yoshiki Nakanish Non-Kramers doublet ground state in a quaternary cubic compound PrRu2In2Zn18 investigated by ultrasonic measurements 2024 Chin. Phys. B 33 064301
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