Universality and Critical Behavior at the Mott Transition

TLDR

The study investigates the critical behavior of conductivity near the Mott‑insulator to metal transition endpoint as a function of pressure and temperature. Conductivity of Cr‑doped V₂O₃ was measured under variable pressure to determine critical exponents and the scaling function of the equation of state. The critical point exhibits universal liquid‑gas transition properties, suggesting a generic description of the Mott critical endpoint in correlated electron materials.

Abstract

We report conductivity measurements of Cr-doped V2O3 using a variable pressure technique. The critical behavior of the conductivity near the Mott-insulator to metal critical endpoint is investigated in detail as a function of pressure and temperature. The critical exponents are determined, as well as the scaling function associated with the equation of state. The universal properties of a liquid-gas transition are found. This is potentially a generic description of the Mott critical endpoint in correlated electron materials.