info:eu-repo/semantics/article
Dynamical mean field theory of an effective three-band model for NaxCoO2
Fecha
2009-01Registro en:
Bourgeois, A.; Aligia, Armando Ángel; Rozenberg, Marcelo Javier; Dynamical mean field theory of an effective three-band model for NaxCoO2; American Physical Society; Physical Review Letters; 102; 6; 1-2009; 664021-664024
0031-9007
CONICET Digital
CONICET
Autor
Bourgeois, A.
Aligia, Armando Ángel
Rozenberg, Marcelo Javier
Resumen
We derive an effective Hamiltonian for highly correlated t2g states centered at the Co sites of NaxCoO2. The essential ingredients of the model are an O mediated hopping, a trigonal crystal-field splitting, and on-site effective interactions derived from the exact solution of a multiorbital model in a CoO6 cluster, with parameters determined previously. The effective model is solved by dynamical mean field theory. We obtain a Fermi surface and electronic dispersion that agrees well with angle-resolved photoemission spectra. Our results also elucidate the origin of the "sinking pockets" in different doping regimes. © 2009 The American Physical Society.