title: Mott transition and suppression of orbital fluctuations in orthorhombic 3d1 perovskites.
abstract: Using t(2g) Wannier functions, a low-energy Hamiltonian is derived for orthorhombic 3d(1) transition-metal oxides. Electronic correlations are treated with a new implementation of dynamical mean-field theory for noncubic systems. Good agreement with photoemission data is obtained. The interplay of correlation effects and cation covalency (GdFeO3-type distortions) is found to suppress orbital fluctuations in LaTiO3 and even more in YTiO3, and to favor the transition to the insulating state.
authors.affiliation: INFM and Dipartimento di Fisica A. Volta, Università di Pavia, Via Bassi 6, I-27100 Pavia, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Pavarini
authors.forename: S
authors.initials: S
authors.lastname: Biermann
authors.forename: A
authors.initials: A
authors.lastname: Poteryaev
authors.forename: A I
authors.initials: AI
authors.lastname: Lichtenstein
authors.forename: A
authors.initials: A
authors.lastname: Georges
authors.forename: O K
authors.initials: OK
authors.lastname: Andersen