2007/05/31 by M M Korshunov, M. M. Korshunov, V. A. Gavrichkov +9
Physics and Astronomy · #Antiferromagnetism #Cuprate #Doping #Electronic band structure #Electronic structure #Fermi surface #Physics of Superconductivity and Magnetism #Quasiparticle #Rare-earth and actinide compounds #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-8984/19/48/486203
published as J. Phys.: Condens. Matter 19, 486203 (2007) · 15 pages, 4 figures, new references and their discussion added, figures updated
openalex publication_date 2007/11/06 · arxiv created 2007/11/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In the present work we report the band structure calculations for the high temperature superconductor Nd2-xCexCuO4 in the regime of strong electronic correlations within an LDA+GTB method, which combines the local density approximation (LDA) and the generalized tight-binding method (GTB). The two mechanisms of band structure doping dependence were taken into account. Namely, the one-electron mechanism provided by the doping dependence of the crystal structure, and the many-body mechanism provided by the strong renormalization of the fermionic quasiparticles due to the large on-site Coulomb repulsion. We have shown that in the antiferromagnetic and in the strongly correlated paramagnetic phases of the underdoped cuprates the main contribution to the doping evolution of band structure and Fermi surface comes from the many-body mechanism.