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

Understand

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).