| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Possible Superconductivity in Biphenylene |
| Jiacheng Ye1, Jun Li2*, DingYong Zhong1, and Dao-Xin Yao1,3* |
1State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China
2Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
3International Quantum Academy, Shenzhen 518048, China
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| Cite this article: |
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Jiacheng Ye, Jun Li, DingYong Zhong et al 2023 Chin. Phys. Lett. 40 077401 |
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Abstract A new two-dimensional allotrope of carbon known as biphenylene has been synthesized. Building on previous research investigating the superconductivity of octagraphene with a square-octagon structure, we conduct a systematic study on possible superconductivity of biphenylene with partial square-octagon structure. First-principle calculations are used to fit the tight-binding model of the material and to estimate its superconductivity. We find that the conventional superconducting transition temperature $T_{\rm c}$ based on electron-phonon interaction is 3.02 K, while the unconventional $T_{\rm c}$ primarily caused by spin fluctuation is 1.7 K. We hypothesize that the remaining hexagonal $C_6$ structure of biphenylene may not be conducive to the formation of perfect Fermi nesting, leading to a lower $T_{\rm c}$. The superconducting properties of this material fall between those of graphene and octagraphene, and it lays a foundation for achieving high-temperature superconductivity in carbon-based materials.
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Received: 13 April 2023
Published: 06 July 2023
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| PACS: |
74.20.-z
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(Theories and models of superconducting state)
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74.20.Rp
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(Pairing symmetries (other than s-wave))
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74.20.Mn
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(Nonconventional mechanisms)
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