Coexistence of Zero-Dimensional Electride State and Superconductivity in AlH_(2)Monolayer  

作　　者：杨秋萍 蒋雪 赵纪军 Qiuping Yang;Xue Jiang;Jijun Zhao(Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Ministry of Education),Dalian University of Technology,Dalian 116024,China)

机构地区：[1]Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Ministry of Education),Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Physics Letters》2023年第10期95-100,共6页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12274050 and 91961204);the Fundamental Research Funds for the Central Universities(Grant Nos.DUT22LAB104 and DUT22ZD103)。

摘　　要：Elect rides,which confine"excess anionic electrons"in subnanometer-sized cavities of a lattice,are exotic ionic crystals.We propose a non-stoichiometric strategy to realize intrinsic two-dimensional(2D)superconducting elect ride.AlH_(2)monolayer,which is structurally identical to 1H-MoS_(2),possesses zero-dimensionally confined anionic electrons in the interstitial sites of A1 triangles,corresponding to a chemical formula of[AlH_(2)]^(+)e^(-).The interaction between interstitial anionic electrons(IAEs)and host cation lattice mainly accounts for stabilization of 1H-AlH_(2)electride.Impressively,1H-AlH_(2)monolayer is an intrinsic Bardeen-Cooper-Schrieffer superconductor with T_(c)=38 K,which is the direct consequence of strong coupling of the H-dominated high electronic states with Al acoustic branch vibrations and mid-frequency H-derived phonon softening modes caused by Kohn anomalies.Under tensile strain,IAEs transform into itinerant electrons,favoring the formation of stable Cooper pairs.Therefore,T_(c)reaches up to 53 K at a biaxial fracture strain of 5%.Our findings provide valuable insights into the correlation between non-stoichiometric electrides and superconducting microscopic mechanisms at the 2D limit.

关 键 词：MONOLAYER INTRINSIC SUPERCONDUCTOR 

分 类 号：O64[理学—物理化学]