Metal-Insulator Transition Temperatures and Excitonic Phases in Vanadium Oxides

Figure 1

Δ as a function of 𝛼. 1: with 𝜇 from (3); 2: (5); 3: (7) with 𝑅=1 a.u. Curve 3 tends to zero at 𝛼_𝑐=0.3-0.4 which corresponds to the Mott criterion (8).