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Role of electronic correlations in the Fermi surface formation of NaCoO
Band structure of metallic sodium cobaltate NaCoO (=0.33, 0.48,
0.61 0.72) has been investigated by local density approximation+Hubbard
(LDA+) method and within Gutzwiller approximation for the Co-
manifold. Correlation effects being taken into account results in suppression
of the hole pockets at the Fermi surface in agreement with recent
angle-resolved photo-emission spectroscopy (ARPES) experiments. In the
Gutzwiller approximation the bilayer splitting is significantly reduced due to
the correlation effects. The formation of high spin (HS) state in Co -shell
was shown to be very improbable.Comment: 6 pages, 2 figure
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