Mott–Hubbard transition in V₂O₃ revisited

The isostructural metal‐insulator transition in Cr‐doped V 2 O 3 is the textbook example of a Mott–Hubbard transition between a paramagnetic metal (PM) and a paramagnetic insulator. We review recent theoretical calculations as well as experimental findings which shed new light on this famous transition. In particular, the old paradigm of a doping‐pressure equivalence does not hold, and there is a microscale phase separation for Cr‐doped V 2 O 3 .