Lattice contraction driven insulator-metal transition in the d=∞ local approximation
Abstract
We study the effects of lattice contraction on insulator-metal transitions in strongly correlated systems, in the context of the d=∞, iterated perturbation theory approximation for the half-filled Hubbard model. We compute the phase diagram in the pressure-temperature plane for the paramagnetic insulator transition. We present results for conductivity jumps across the transition and for the variation in conductivity with pressure and temperature in either phase. Our results agree qualitatively with experimental data on transition metal oxides.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 1994
- DOI:
- 10.1103/PhysRevLett.73.1525
- Bibcode:
- 1994PhRvL..73.1525M
- Keywords:
-
- 71.27.+a;
- 71.10.+x;
- 71.28.+d;
- 74.20.Mn;
- Strongly correlated electron systems;
- heavy fermions;
- Narrow-band systems;
- intermediate-valence solids;
- Nonconventional mechanisms