Observation of a critical charge mode in a strange metal
Observation of a critical charge mode in a strange metal
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奇怪金属中临界充电模式的观察
DOI：
10.1126/science.abc4787
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发表时间：
2023
期刊：
影响因子：
56.9
通讯作者：
Coleman Piers
中科院分区：
文献类型：
--
作者：
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
要理解量子材料中在局域化边缘发展起来的奇怪的金属行为，需要探索潜在的电子电荷动力学。利用同步辐射穆斯堡尔谱研究了β-YbAlB4奇异金属相的电荷涨落随温度和压力的变化。我们发现，在费米-液区，通常的单吸收峰在进入临界区后分裂成两个峰。我们将这一光谱解释为单核跃迁，受附近电子价涨落的调制，其长时间尺度因带电极化子的形成而进一步增强。这些临界电荷波动可能被证明是奇怪金属的明显特征。
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-YbAlB4as 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.