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We propose the concept of "hybridization-switching induced Mott transition"which is relevant to a broad class of ABO$_3$ perovskite materials includingBiNiO$_3$ and PbCrO$_3$ which feature extended $6s$ orbitals on the A-sitecation (Bi or Pb), and A-O covalency induced ligand holes. Using {\it abinitio} electronic structure and slave rotor theory calculations, we show thatsuch systems exhibit a breathing phonon driven A-site to oxygenhybridization-wave instability which conspires with strong correlations on theB-site transition metal ion (Ni or Cr) to induce a Mott insulator. These Mottinsulators with active A-site orbitals are shown to undergo a pressure inducedinsulator to metal transition accompanied by a colossal volume collapse due toligand hybridization switching.

Hybridization-switching induced Mott transition in ABO$_3$ perovskites