Hallmarks of Hund's coupling in the Mott insulator Ca${}_2$RuO${}_4$

D. Sutter, C. G. Fatuzzo, S. Moser +22

A paradigmatic case of multi-band Mott physics including spin-orbit and Hund's coupling is realised in Ca${}_2$RuO${}_4$. Progress in understanding the nature of this Mott insulating p…