Observation of a critical charge mode in a strange metal

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-YbAlB a...

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Published in:Science (American Association for the Advancement of Science) 2023-03, Vol.379 (6635), p.908-912
Main Authors: Kobayashi, Hisao, Sakaguchi, Yui, Kitagawa, Hayato, Oura, Momoko, Ikeda, Shugo, Kuga, Kentaro, Suzuki, Shintaro, Nakatsuji, Satoru, Masuda, Ryo, Kobayashi, Yasuhiro, Seto, Makoto, Yoda, Yoshitaka, Tamasaku, Kenji, Komijani, Yashar, Chandra, Premala, Coleman, Piers
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Language:English
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Summary: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-YbAlB 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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.abc4787