High-Temperature Phonon-Mediated Superconductivity with T_(c) above 100K in Monolayer Na(BC)_(2) and K(BC)_(2)  

作　　者：Wenxuan Chen Zhengtao Liu Zihao Huo Guiyan Dong Jialiang Cai Defang Duan 陈文轩;刘正涛;霍子豪;董桂言;蔡嘉良;段德芳(Key Laboratory of Material Simulation Methods&Software of Ministry of Education,and State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,China)

机构地区：[1]Key Laboratory of Material Simulation Methods&Software of Ministry of Education,and State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,China

出　　处：《Chinese Physics Letters》2024年第11期143-153,共11页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12122405 and 12274169);the National Key Research and Development Program of China(Grant Nos.2022YFA1402304 and 2023YFA1406200);the Fundamental Research Funds for the Central Universities。

摘　　要：Two-dimensional(2D)materials have demonstrated promising prospects owing to their distinctive electronic properties and exceptional mechanical properties.Among them,2D superconductors with T_(c) above the boiling point of liquid nitrogen(77 K)will exhibit tremendous applicable value in the future.Here,we design two 2D superconductors Na(BC)_(2) and K(BC)_(2) with MgB2-like structures,which are theoretically predicted to host T_(c) as high as 99 and 102 K,respectively.The origin of such high T_(c) is ascribed to the presence of both𝜎-bonding bands and van Hove singularity at the Fermi level.Furthermore,T_(c) of Na(BC)_(2) is boosted up to 153K with a biaxial strain of 5%,which sets a new record among 2D superconductors.The predictions of Na(BC)_(2) and K(BC)_(2) open the door to explore 2D high-temperature superconductors and provide a potential future for developing new applications in 2D materials.

关 键 词：properties SUPERCONDUCTORS SINGULARITY 

分 类 号：O469[理学—凝聚态物理]