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Kobayashi H, Sakaguchi Y, Kitagawa H, Oura M, Ikeda S, Kuga K, Suzuki S, Nakatsuji S, Masuda R, Kobayashi Y, Seto M, Yoda Y, Tamasaku K, Komijani Y, Chandra P, Coleman P. Observation of a critical charge mode in a strange metal. Science 2023. [PMID: 36862771 DOI: 10.1126/science.abc4787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
Understanding the strange metallic behavior that develops at the brink of localization in quantum materials requires probing the underlying electronic charge dynamics. Using synchrotron radiation-based Mössbauer spectroscopy, we studied the charge fluctuations of the strange metal phase of β-YbAlB4 as a function of temperature and pressure. We found that the usual single absorption peak in the Fermi-liquid regime splits into two peaks upon entering the critical regime. We interpret this spectrum as a single nuclear transition, modulated by nearby electronic valence fluctuations whose long time scales are further enhanced by the formation of charged polarons. These critical charge fluctuations may prove to be a distinct signature of strange metals.
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Affiliation(s)
- Hisao Kobayashi
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan.,RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Yui Sakaguchi
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan
| | - Hayato Kitagawa
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan.,RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Momoko Oura
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan.,RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Shugo Ikeda
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan.,RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Kentaro Kuga
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Shintaro Suzuki
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Satoru Nakatsuji
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.,Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,Trans-scale Quantum Science Institute, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.,Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Ryo Masuda
- RIKEN SPring-8 Center, Hyogo 679-5148, Japan.,Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka 590-0494, Japan.,Graduate School of Science and Technology, Hirosaki University, Aomori 036-8561 Japan
| | - Yasuhiro Kobayashi
- RIKEN SPring-8 Center, Hyogo 679-5148, Japan.,Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka 590-0494, Japan
| | - Makoto Seto
- RIKEN SPring-8 Center, Hyogo 679-5148, Japan.,Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka 590-0494, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan
| | | | - Yashar Komijani
- Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011, USA.,Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
| | - Premala Chandra
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
| | - Piers Coleman
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA.,Hubbard Theory Consortium, Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
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