The British namesake of these materials also names a critical point for their transition in terms of the Bohr radius. For 10 points each:
[10h] Name these strongly correlated materials, whose electron-electron interactions drive a transition that classical solid-state physics fails to predict, but which is explained by the Hubbard model.
ANSWER: Mott insulators [prompt on insulators]
[10m] Classical theory incorrectly predicts that this region is partially filled in Mott insulators. In typical insulators, the Fermi level lies in the “gap” between this region and a “conduction” counterpart.
ANSWER: valence band [prompt on partial answer]
[10e] Mott insulators transition from these conductive materials, in which the valence and conduction bands are continuous. The first Mott insulators to be discovered were oxides of the “transition” block of these materials.
ANSWER: metals [accept transition metals]
<JC, Physics>