Correlation between unconventional superconductivity and strange metallicity revealed by operando superfluid density measurements
| Autor: | Zhang, Ruozhou, Qin, Mingyang, Li, Chenyuan, Zhao, Zhanyi, Wei, Zhongxu, Xu, Juan, Jiang, Xingyu, Cheng, Wenxin, Shi, Qiuyan, Wang, Xuewei, Yuan, Jie, Li, Yangmu, Chen, Qihong, Xiang, Tao, Sachdev, Subir, Li, Zi-Xiang, Jin, Kui, Zhao, Zhongxian |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Strange-metal behavior has been observed in superconductors ranging from cuprates to pressurized nickelates, but its relationship to unconventional superconductivity remains elusive. Here, we perform operando superfluid density measurements on ion-gated FeSe films. We observe for the first time a synchronized evolution of superconducting condensate and the strange-metal phase with electron doping. A linear scaling between zero-temperature superfluid density and the strange-metal resistivity coefficient is further established, which nails down a direct link between the formation of superfluid in the superconducting state and the scattering of carriers in the strange-metal normal state. Remarkably, the scaling also applies for different iron-based and cuprate superconductors despite their distinct electronic structures and pairing symmetries. Such a correlation can be reproduced in a theoretical calculation on the two-dimensional Yukawa-Sachdev-Ye-Kitaev model by considering a cooperative effect of quantum critical fluctuation and disorder. These findings indicate a fundamental principle governing superconducting condensation and strange-metal scattering in unconventional superconductors. Comment: 36 pages, 18 figures |
| Databáze: | arXiv |
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