Interplay of orbital-selective Mott criticality and flat-band physics in La${}_3$Ni${}_2$O${}_6$

Frank Lechermann, Steffen Bötzel, Ilya M. Eremin

Superconductivity in nickelates apparently takes place in two different Ni oxidation regimes, namely either for infinite-layer-type compounds close to Ni${}^{+}$, or for Ruddlesden-P…