title: Investigating Robust Honeycomb Borophenes Sandwiching Manganese Layers in Manganese Diboride.
abstract: We report a robust honeycomb boron layers sandwiching manganese layers compound, MnB2, synthesized by high pressure and high temperature. First-principle calculation combined with X-ray photoelectron spectrum unravel that the honeycomb boron structure was stabilized by filling the empty π-band via grabbing electrons from manganese layers. Honeycomb boron layers sandwiching manganese layers is an extraordinary prototype of this type of sandwiched structure exhibiting electronic conductivity and ferromagnetism. Hydrostatic compression of the crystal structure, thermal expansion, and the hardness testing reveal that the crystal structure is of strong anisotropy. The strong anisotropy and first-principle calculation suggests that B-B bonds in the honeycomb boron structure are a strong directional covalent feature, while the Mn-B bonds are soft ionic nature. Sandwiching honeycomb boron layers with manganese layers that combine p-block elements with magnetic transition metal elements could endow its novel physical and chemical properties.
authors: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors: Shuailing
authors: S
authors: Ma
authors: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors: Kuo
authors: K
authors: Bao
authors: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors: Qiang
authors: Q
authors: Tao
authors: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors: Chunhong
authors: C
authors: Xu
authors: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors: Xiaokang
authors: X
authors: Feng
authors: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors: Pinwen
authors: P
authors: Zhu
authors: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors: Tian
authors: T
authors: Cui