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28 March 2024
 
  » arxiv » cond-mat/0407085

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Strong- and weak-coupling mechanisms for pseudogap in electron-doped cuprates
V.Hankevych ; B.Kyung ; A-M.Dare ; D.Senechal ; A.M.Tremblay ;
Date 3 Jul 2004
Subject Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con
AbstractUsing the two-particle self-consistent approach and cluster perturbation theory for the two-dimensional t-t’-t’’-U Hubbard model, we discuss weak- and strong-coupling mechanisms for the pseudogap observed in recent angle resolved photoemission spectroscopy on electron-doped cuprates. In the case of the strong-coupling mechanism, which is more relevant near half-filling, the pseudogap can be mainly driven by short range correlations near the Mott insulator. In the vicinity of optimal doping, where weak-coupling physics is more relevant, large antiferromagnetic correlation lengths, seen in neutron measurements, are the origin of the pseudogap. The t-J model is not applicable in the latter case.
Source arXiv, cond-mat/0407085
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