Volume 63, Number 1, July 2003
|Page(s)||97 - 103|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 June 2003|
Absence of orbital-dependent Mott transition in x
Institut für Festkörperforschung, Forschungszentrum Jülich - 52425 Jülich, Germany
Accepted: 6 May 2003
The Mott transition between the metallic and insulating paramagnetic phases of the layer perovskite 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 bands near into a wide, two-dimensional dxy band and two narrow, nearly one-dimensional bands. At larger U, however, the spectral distribution of these states exhibits similar correlation features, suggesting a common metal-insulator transition for all bands at the same critical U.
PACS: 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
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