High temperature superconductor Na_(2)B_(2)H stabilized by hydrogen intercalation under ambient pressure  

作　　者：Wendi Zhao Defang Duan Zhengtao Liu Zihao Huo Shumin Guo Decheng An Maosheng Miao Tian Cui 

机构地区：[1]State Key Laboratory of Superhard Materials,Key Laboratory of Material Simulation Methods&Software of Ministry of Education,College of Physics,Jilin University,Changchun 130012,China [2]Department of Chemistry and Biochemistry,California State University,Northridge,California 91330,USA [3]Department of Earth Science,University of California,Santa Barbara,California 93106,USA [4]Institute of High Pressure Physics,School of Physical Science and Technology,Ningbo University,Ningbo 315211,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第11期141-148,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52072188,12122405,and 12274169);the National Key Research and Development Program of China(Grant No.2022YFA1402304);the Program for Science and Technology Innovation Team in Zhejiang(Grant No.2021R01004);the Fundamental Research Funds for the Central Universities;the support of the National Science Foundation(NSF)(Grant Nos.Division of Materials Research(DMR)-1848141 and Office of Advanced Cyberinfrastructure(OAC)-2117956);the Camille and Henry Dreyfus Foundation;the California State University Research,Scholarship;Creative Activity(RSCA)award。

摘　　要：Hydrogenated metal borides have attracted much attention due to their potential high-temperature superconductivity.Here,we propose a new strategy for hydrogen intercalation tuning the stability and superconductivity of the boron honeycomb sublattice,and predict an unprecedented layered compound Na_(2)B_(2)H,which hosts excellent superconductivity.Strikingly,the superconducting transition temperature(Tc)of Na_(2)B_(2)H reaches 42 K at ambient pressure.The Tcvalue can be further increase to 63 K under 5%biaxial tensile strain.The excellent superconductivity originates from the strong electron-phonon coupling between theσ-bonding bands near the Fermi level and the B-B stretching optical E modes.The interstitial electron localization and crystal orbitals of the H-intercalated Na ion layer well match the boron honeycomb lattice and act as a chemical template to stabilize the B layer.Furthermore,the introduction of hydrogen tuned the Fermi level,and the coupling vibration of Na and H ions effectively enhanced the dynamic stability of the structure.Na_(2)B_(2)H represents a new family of layered high-temperature superconductors,and the strategy of stabilizing the honeycomb boron sublattice via chemical template hosts great potential for application to more layered compounds.

关 键 词：SUPERCONDUCTIVITY HYDROGENATION metal borides electron-phonon coupling 

分 类 号：O469[理学—凝聚态物理]