## Mott transition

Synonym: Mott–Hubbard transition
https://doi.org/10.1351/goldbook.M04037
A transition occurring only in 'single-valent' systems from strongly correlated ($$U > W$$) to weakly correlated ($$U < W$$) electrons as a result of a change of bandwidth $$W$$. $$W$$ reflects the strength of the interatomic interactions in a periodic array of like atoms and $$U$$ is a measure of the intra-atomic interactions, i.e. the electrostatic energy involved in the creation of polar states by transferring an electron from one atom to the next, as shown schematically by the @D01799@ reaction: $\text{M}^{n+}+\text{M}^{n+}\rightarrow \text{M}^{(n+1)+}+\text{M}^{(n- 1)+}$ A $$U > W$$ produces a magnetic @S05591@; a $$U < W$$ gives rise to a metal (normally nonmagnetic). Note also that $$U$$ and $$W$$ can be altered by changes in interatomic distances, brought about through temperature or pressure variations or by introducing an alloying element. Synonymous with Mott–Hubbard transition.
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 587 [Terms] [Paper]