Magnetic Weyl semimetal Co3Sn2S2 through the Curie temperature

Our paper came out recently, entitled “Electronic structure and topology across $T_c$ in the magnetic Weyl semimetal ${\mathrm{Co}}_3{\mathrm{Sn}}_2{S}_2$”

https://journals.aps.org/prb/abstract/10.1103/PhysRevB.104.155115

Co3Sn2S2 is a ferromagnet below Tc=177K, and the time reversal symmetry breaking in the magnetic phase stabilizes Weyl points.  Earlier studies have established this material to be a Weyl semimetal in its ground state, but our recent paper is the first published work through Tc.  We observe spectroscopic evidence of a topological phase transition across Tc (somewhat expected), but surprisingly also see flatter bands above Tc, suggesting enhanced electronic correlation effects above Tc.  This work was a collaboration between our group, as well as the Savrasov (theory) and Taufour (synthesis) groups at UC Davis.  Congratulations to Antonio, Seva, Adam, Sudheer, and Zio!