Universality and Critical Behavior at the Mott transition

TL;DR

This paper investigates the critical behavior at the Mott transition in Cr-doped V2O3, revealing universal liquid-gas transition properties and determining critical exponents through conductivity measurements under varying pressure and temperature.

Contribution

It provides the first detailed analysis of the critical exponents and scaling functions at the Mott critical endpoint in a correlated electron material.

Findings

Critical exponents are determined near the Mott transition.

Universal liquid-gas transition properties are observed.

Scaling functions consistent with a liquid-gas transition are identified.

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.