Microscopic Observation of Heavy Quasiparticle Formation in the Intermediate Valence Compound EuNi$_2$P$_2$: $^{31}$P NMR Study
| Autor: | Higa, Nonoka, Yogi, Mamoru, Kuroshima, Hiroko, Toji, Tatsuki, Niki, Haruo, Hiranaka, Yuichi, Nakamura, Ai, Nakama, Takao, Hedo, Masato, Ōnuki, Yoshichika |
|---|---|
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | J. Phys. Soc. Jpn. 87, 094708 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.7566/JPSJ.87.094708 |
| Popis: | We report $^{31}$P NMR measurements under various magnetic fields up to 7 T for the intermediate valence compound EuNi$_2$P$_2$, 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 $4f$ 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 $1/T_1$. With the occurrence of the Kondo effect, $1/T_1$ 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 $4f$ 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 EuNi$_2$P$_2$. Comment: 7 pages, 5 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|