一种磁性拓扑半金属SrMnSb（y，z < 0.1）。
A magnetic topological semimetal SrMnSb (y, z < 0.1).
作者信息
Liu J Y, Hu J, Zhang Q, Graf D, Cao H B, Radmanesh S M A, Adams D J, Zhu Y L, Cheng G F, Liu X, Phelan W A, Wei J, Jaime M, Balakirev F, Tennant D A, DiTusa J F, Chiorescu I, Spinu L, Mao Z Q
机构信息
Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70018, USA.
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
出版信息
Nat Mater. 2017 Sep;16(9):905-910. doi: 10.1038/nmat4953. Epub 2017 Jul 24.
Weyl (WSMs) evolve from Dirac semimetals in the presence of broken time-reversal symmetry (TRS) or space-inversion symmetry. The WSM phases in TaAs-class materials and photonic crystals are due to the loss of space-inversion symmetry. For TRS-breaking WSMs, despite numerous theoretical and experimental efforts, few examples have been reported. In this Article, we report a new type of magnetic semimetal SrMnSb (y, z < 0.1) with nearly massless relativistic fermion behaviour (m = 0.04 - 0.05m, where m is the free-electron mass). This material exhibits a ferromagnetic order for 304 K < T < 565 K, but a canted antiferromagnetic order with a ferromagnetic component for T < 304 K. The combination of relativistic fermion behaviour and ferromagnetism in SrMnSb offers a rare opportunity to investigate the interplay between relativistic fermions and spontaneous TRS breaking.
外尔半金属（WSMs）是在时间反演对称性（TRS）或空间反演对称性破缺的情况下，由狄拉克半金属演化而来。TaAs类材料和光子晶体中的WSM相是由于空间反演对称性的丧失。对于TRS破缺的WSMs，尽管进行了大量的理论和实验研究，但报道的例子很少。在本文中，我们报道了一种新型的磁性半金属SrMnSb（y，z < 0.1），它具有近乎无质量的相对论费米子行为（m = 0.04 - 0.05m，其中m是自由电子质量）。这种材料在304 K < T < 565 K时表现出铁磁序，但在T < 304 K时表现出具有铁磁分量的倾斜反铁磁序。SrMnSb中相对论费米子行为和铁磁性的结合为研究相对论费米子与自发TRS破缺之间的相互作用提供了一个难得的机会。
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