title: Low energy electronic states and triplet pairing in layered cobaltate.
abstract: The structure of the low-energy electronic states in layered cobaltates is considered starting from the Mott insulating limit. We argue that the coherent part of the wave functions and the Fermi-surface topology at low doping are strongly influenced by spin-orbit coupling of the correlated electrons on the t(2g) level. An effective t-J model based on mixed spin-orbital states is radically different from that for the cuprates, and supports unconventional, pseudospin-triplet pairing.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Khaliullin
authors.forename: W
authors.initials: W
authors.lastname: Koshibae
authors.forename: S
authors.initials: S
authors.lastname: Maekawa