Role of electronic correlations in the Fermi surface formation of Na$ x$CoO$ 2$ - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: Band structure of metallic sodium cobaltate Na$ x$CoO$ 2$ ($x$=0.33, 0.48,0.61 0.72) has been investigated by local density approximation+Hubbard $U$(LDA+$U$) method and within Gutzwiller approximation for the Co-$t {2g}$manifold. Correlation effects being taken into account results in suppressionof the $e- g$ hole pockets at the Fermi surface in agreement with recentangle-resolved photo-emission spectroscopy (ARPES) experiments. In theGutzwiller approximation the bilayer splitting is significantly reduced due tothe correlation effects. The formation of high spin (HS) state in Co $d$-shellwas shown to be very improbable.



Autor: A.O. Shorikov, M.M. Korshunov, V.I. Anisimov

Fuente: https://arxiv.org/



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