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

J.Y. Liu , J. Hu , Q. Zhang , D. Graf , H.B. Cao , S.M.A. Radmanesh , D.J. Adams , Y.L. Zhu

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G.F. Cheng X. Liu W. A. Phelan J. Wei D. A. Tennant J. F. DiTusa I. Chiorescu L. Spinu Z.Q. Mao

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classification ❄️ cond-mat.mtrl-sci cond-mat.mes-hall

keywords relativisticsr1-ymn1-zsb2symmetrybehaviourfermionferromagneticmagneticorder

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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.

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

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