| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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BaCuS$_{2}$: A Superconductor with Moderate Electron-Electron Correlation |
| Yuhao Gu1, Xianxin Wu1, Kun Jiang1, and Jiangping Hu1,2* |
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2CAS Center of Excellence in Topological Quantum Computation and Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
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| Cite this article: |
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Yuhao Gu, Xianxin Wu, Kun Jiang et al 2021 Chin. Phys. Lett. 38 017501 |
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Abstract We show that the layered-structure BaCuS$_{2}$ is a moderately correlated electron system in which the electronic structure of the CuS layer bears a resemblance to those in both cuprates and iron-based superconductors. Theoretical calculations reveal that the in-plane $d$–$p$ $\sigma^*$-bonding bands are isolated near the Fermi level. As the energy separation between the $d$ and $p$ orbitals are much smaller than those in cuprates and iron-based superconductors, BaCuS$_{2}$ is expected to be moderately correlated. We suggest that this material is an ideal system to study the competitive/collaborative nature between two distinct superconducting pairing mechanisms, namely the conventional BCS electron-phonon interaction and the electron-electron correlation, which may be helpful to establish the elusive mechanism of unconventional high-temperature superconductivity.
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Received: 16 September 2020
Published: 18 November 2020
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| Fund: Supported by the National Key R&D Program of China (Grant No. 2017YFA0303100), the National Natural Science Foundation of China (Grant No. 11888101), and the Strategic Priority Research Program of CAS (Grant No. XDB28000000). |
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