Microscopic observation of heavy quasiparticle formation in the intermediate valence compound EuNi2P2: 31PNMR study

Nonoka Higa, Mamoru Yogi, Hiroko Kuroshima, Tatsuki Toji, Haruo Niki, Yuichi Hiranaka, Ai Nakamura, Takao Nakama, Masato Hedo, Yoshichika Ōnuki

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Abstract

We report 31P NMR measurements under various magnetic fields up to 7 T for the intermediate valence compound EuNi2P2, which shows heavy electronic states at low temperatures. In the high-temperature region above 40 K, the Knight shift followed the Curie-Weiss law reflecting localized 4 f states. In addition, the behavior corresponding to the temperature variation of the average valence of Eu was observed in the nuclear spin-lattice relaxation rate 1=T1. With the occurrence of the Kondo effect, 1=T1 was clearly reduced below 40 K, and the Knight shift becomes almost constant at low temperatures. From these results, the formation of heavy quasiparticles by the hybridization of Eu 4 f electrons and conduction electrons was clarified from microscopic viewpoints. Furthermore, a characteristic spin fluctuation was observed at low temperatures, which would be associated with valence fluctuations caused by the intermediate valence state of EuNi2P2

Original languageEnglish
Article number094708
Journaljournal of the physical society of japan
Volume87
Issue number9
DOIs
Publication statusPublished - 2018 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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