Protonation-induced discrete superconducting phases in bulk FeSe single crystals
| Autor: | Meng, Yan, Xing, Xiangzhuo, Yi, Xiaolei, Li, Bin, Zhou, Nan, Li, Meng, Zhang, Yufeng, Wei, Wei, Feng, Jiajia, Terashima, Kensei, Takano, Yoshihiko, Sun, Yue, Shi, Zhixiang |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review B 105, 134506 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.105.134506 |
| Popis: | The superconducting transition temperature, $T_{\rm{c}}$, of FeSe can be significantly enhanced several-fold by applying pressure, electron doping, intercalating spacing layer, and reducing dimensionality. Various ordered electronic phases, such as nematicity and spin density waves, have also been observed accompanying high-$T_{\rm{c}}$ superconductivity. Investigation on the evolution of the electronic structure with $T_{\rm{c}}$ is essential to understanding electronic behavior and high-$T_{\rm{c}}$ superconductivity in FeSe and its derived superconductors. In this report, we have found a series of discrete superconducting phases, with a maximum $T_{\rm{c}}$ up to 44 K, in H$^+$-intercalated FeSe single crystals using an ionic liquid gating method. Accompanied with the increase of $T_{\rm{c}}$, suppression of the nematic phase and evolution from non-Fermi-liquid to Fermi-liquid behavior was observed. An abrupt change in the Fermi surface topology was proposed to explain the discrete superconducting phases. A band structure that favors the high-$T_{\rm{c}}$ superconducting phase was also revealed. Comment: 23 pages, 8 figures |
| Databáze: | arXiv |
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