A novel two-dimensional MgB6 crystal: metal-layer stabilized boron kagome lattice

被引:45
|
作者
Xie, Sheng-Yi [1 ]
Li, Xian-Bin [1 ]
Tian, Wei Quan [1 ,2 ]
Chen, Nian-Ke [1 ]
Wang, Yeliang [3 ]
Zhang, Shengbai [4 ]
Sun, Hong-Bo [1 ]
机构
[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China
[2] Jilin Univ, Inst Theoret Chem, State Key Lab Theoret & Computat Chem, Changchun 130012, Peoples R China
[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[4] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
GRAPHENE-OXIDE; SUPERCONDUCTIVITY; TEMPERATURE; REDUCTION; NITRIDE;
D O I
10.1039/c4cp03728f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Based on first-principles calculations, we designed for the first time a boron-kagome-based two-dimensional MgB6 crystal, in which two boron kagome layers sandwich a triangular magnesium layer. The two-dimensional lattice is metallic with several bands across the Fermi level, and among them a Dirac point appears at the K point of the first Brillouin zone. This metal-stabilized boron kagome system displays electron-phonon coupling, with a superconductivity critical transition temperature of 4.7 K, and thus it is another possible superconducting Mg-B compound besides MgB2. Furthermore, the proposed 2D MgB6 can also be used for hydrogen storage after decoration with Ca. Up to five H-2 molecules can be attracted by one Ca with an average binding energy of 0.225 eV. The unique properties of 2D MgB6 will spur broad interest in nanoscience and technology.
引用
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页码:1093 / 1098
页数:6
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