Europhys. Lett., 63 (1) , pp. 97-103 (2003)
Absence of orbital-dependent Mott transition in 2-x xA. Liebsch
Institut für Festkörperforschung, Forschungszentrum Jülich - 52425 Jülich, Germany
(Received 31 January 2003; accepted in final form 6 May 2003)
The Mott transition between the metallic and insulating paramagnetic phases of the layer perovskite 2-x x is analyzed within the Dynamical Mean Field Theory. To simulate the band narrowing caused by finite doping concentrations, quasi-particle spectra appropriate for are evaluated for increasing values of the on-site Coulomb energy U. At small U the planar geometry splits the t2g bands near into a wide, two-dimensional dxy band and two narrow, nearly one-dimensional dxz,yz bands. At larger U, however, the spectral distribution of these states exhibits similar correlation features, suggesting a common metal-insulator transition for all t2g bands at the same critical U.
71.20.Be - Transition metals and alloys.
71.27.+a - Strongly correlated electron systems; heavy fermions.
79.60.Bm - Clean metal, semiconductor, and insulator surfaces.
© EDP Sciences 2003