4 years ago

A magnetic topological semimetal Sr1−yMn1−zSb2 (y, z < 0.1)

A magnetic topological semimetal Sr1−yMn1−zSb2 (y, z &lt; 0.1)
Y. L. Zhu, J. Y. Liu, W. A. Phelan, G. F. Cheng, D. J. Adams, J. F. DiTusa, H. B. Cao, L. Spinu, J. Wei, X. Liu, Z. Q. Mao, S. M. A. Radmanesh, Q. Zhang, D. A. Tennant, M. Jaime, D. Graf, J. Hu, I. Chiorescu, F. Balakirev
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 Sr1−yMn1−zSb2 (y, z < 0.1) with nearly massless relativistic fermion behaviour (m =  0.04 − 0.05m0, where m0 is the free-electron mass). This material exhibits a ferromagnetic order for 304K  <  T  <  565K, but a canted antiferromagnetic order with a ferromagnetic component for T  <  304K. The combination of relativistic fermion behaviour and ferromagnetism in Sr1−yMn1−zSb2 offers a rare opportunity to investigate the interplay between relativistic fermions and spontaneous TRS breaking.

Publisher URL: http://dx.doi.org/10.1038/nmat4953

DOI: 10.1038/nmat4953

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