BaCuS_2: A Superconductor with Moderate Electron-Electron Correlation |
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| Authors: | Yuhao Gu Xianxin Wu Kun Jiang Jiangping Hu |
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| Affiliation: | (Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;CAS 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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| 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 o~*-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,BaCuS2 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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