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Weyl (WSMs) evolve from Dirac semimetals in the presence of brokentime-reversal symmetry (TRS) or space-inversion symmetry. The WSM phases inTaAs-class materials and photonic crystals are due to the loss ofspace-inversion symmetry. For TRS-breaking WSMs, despite numerous theoreticaland experimental efforts, few examples have been reported. In this Article, wereport a new type of magnetic semimetal Sr1-yMn1-zSb2 (y,z<0.1) with nearlymassless relativistic fermion behaviour (m*=0.04-0.05m0, where m0 is the freeelectron 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 inSr1-yMn1-zSb2 offers a rare opportunity to investigate the interplay betweenrelativistic fermions and spontaneous TRS breaking.

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