Quantum valence criticality in a correlated metal

Kentaro Kuga, Yosuke Matsumoto, Mario Okawa, Shintaro Suzuki, Takahiro Tomita, Keita Sone, Yasuyuki Shimura, Toshiro Sakakibara, Daisuke Nishio-Hamane, Yoshitomo Karaki, Yasutaka Takata, Masaharu Matsunami, Ritsuko Eguchi, Munetaka Taguchi, Ashish Chainani, Shik Shin, Kenji Tamasaku, Yoshinori Nishino, Makina Yabashi, Tetsuya IshikawaSatoru Nakatsuji

研究成果: Article

9 引文 斯高帕斯(Scopus)

摘要

A valence critical end point existing near the absolute zero provides a unique case for the study of a quantum version of the strong density fluctuation at the Widom line in the supercritical fluids. Although singular charge and orbital dynamics are suggested theoretically to alter the electronic structure significantly, breaking down the standard quasi-particle picture, this has never been confirmed experimentally to date. We provide the first empirical evidence that the proximity to quantum valence criticality leads to a clear breakdown of Fermi liquid behavior. Our detailed study of the mixed valence compound a-YbAlB4 reveals that a small chemical substitution induces a sharp valence crossover, accompanied by a pronounced non-Fermi liquid behavior characterized by a divergent effective mass and unusual T/B scaling in the magnetization.

原文English
文章編號eaao3547
期刊Science Advances
4
發行號2
DOIs
出版狀態Published - 2018 二月 23

All Science Journal Classification (ASJC) codes

  • General

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  • 引用此

    Kuga, K., Matsumoto, Y., Okawa, M., Suzuki, S., Tomita, T., Sone, K., Shimura, Y., Sakakibara, T., Nishio-Hamane, D., Karaki, Y., Takata, Y., Matsunami, M., Eguchi, R., Taguchi, M., Chainani, A., Shin, S., Tamasaku, K., Nishino, Y., Yabashi, M., ... Nakatsuji, S. (2018). Quantum valence criticality in a correlated metal. Science Advances, 4(2), [eaao3547]. https://doi.org/10.1126/sciadv.aao3547