Phys. Rev. Lett. 94, 196401 (2005) [4 pages]

Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO₂

Abstract

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H. Ishida^1,*, M. D. Johannes^2,†, and A. Liebsch^3,‡
¹College of Humanities and Sciences, Nihon University, and CREST JST, Tokyo 156, Japan
²Code 6391, Naval Research Laboratory, Washington, D.C. 20375, USA
³Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany

Received 23 December 2004; published 17 May 2005

The t_2g quasiparticle spectra of Na_0.3CoO₂ are calculated within the dynamical mean field theory. It is shown that as a result of dynamical Coulomb correlations charge is transferred from the nearly filled e_g^′ subbands to the a_1g band, thereby reducing orbital polarization among Co t_2g states. Dynamical correlations therefore stabilize the small e_g^′ Fermi surface pockets, in contrast to angle-resolved photoemission data, which do not reveal these pockets.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.94.196401

DOI:

10.1103/PhysRevLett.94.196401

PACS:

71.20.Be, 71.18.+y

^*Electronic address: ishida@chs.nihon-u.ac.jp

^†Electronic address: johannes@ dave.nrl.navy.mil

^‡Electronic address: a.liebsch@fz-juelich.de

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Phys. Rev. Lett. 94, 196401 (2005) [4 pages]

Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na0.3CoO2

Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO₂