Peierls distortion, magnetism, and high hardness of manganese tetraboride

被引:65
作者
Gou, Huiyang [1 ,2 ]
Tsirlin, Alexander A. [3 ]
Bykova, Elena [1 ,2 ]
Abakumov, Artem M. [4 ]
Van Tendeloo, Gustaaf [4 ]
Richter, Asta [5 ]
Ovsyannikov, Sergey V. [1 ]
Kurnosov, Alexander V. [1 ]
Trots, Dmytro M. [1 ]
Konopkova, Zuzana
Liermann, Hans-Peter [6 ]
Dubrovinsky, Leonid [1 ]
Dubrovinskaia, Natalia [2 ]
机构
[1] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany
[2] Univ Bayreuth, Crystallog Lab, D-95440 Bayreuth, Germany
[3] NICPB, E-12618 Tallinn, Estonia
[4] Univ Antwerp, Electron Microscopy Mat Res EMAT, B-2020 Antwerp, Belgium
[5] Tech Hsch Wildau, D-15745 Wildau, Germany
[6] Deutsch Electronen Synchrtron, DESY Photon Sci, D-22607 Hamburg, Germany
基金
欧洲研究理事会;
关键词
SUPERHARD RHENIUM DIBORIDE; CRYSTAL-STRUCTURE; ELECTRON; BORON;
D O I
10.1103/PhysRevB.89.064108
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report crystal structure, electronic structure, and magnetism of manganese tetraboride, MnB4, synthesized under high-pressure, high-temperature conditions. In contrast to superconducting FeB4 and metallic CrB4, which are both orthorhombic, MnB4 features a monoclinic crystal structure. Its lower symmetry originates from a Peierls distortion of the Mn chains. This distortion nearly opens the gap at the Fermi level, but despite the strong dimerization and the proximity of MnB4 to the insulating state, we find indications for a sizable paramagnetic effective moment of about 1.7 mu(B)/f.u., ferromagnetic spin correlations, and, even more surprisingly, a prominent electronic contribution to the specific heat. However, no magnetic order has been observed in standard thermodynamic measurements down to 2 K. Altogether, this renders MnB4 a structurally simple but microscopically enigmatic material; we argue that its properties may be influenced by electronic correlations.
引用
收藏
页数:9
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