Abstract
Within the framework of the Charge Density Wave Quantum Critical Point(CDW-QCP) scenario for high-T c superconductors (HTCS) we introduce a modelfor tight-binding electrons coupled to quasi-critical fluctuations. In thenormal state our model reproduces features the Fermi Surface (FS) observedin ARPES measurements on optimality doped Bi2212, such as the anisotropicsuppression of spectral weight around the M points of the Brillouinzone. The spectral density is characterized by a transfer of spectral weightfrom the main quasiparticle peak to dispersing shadow peaks which originatebranches of a shadow FS. In the superconducting state our model reproducesthe d-wave symmetry of the gap parameter, which results from a balancebetween small-q attraction and large-q repulsion. The gap parameter isenhanced due to cooperative effects of charge and spin fluctuations.
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Caprara, S., Perali, A. & Sulpizi, M. Shadow Bands, Gap and Pseudogaps in High-Tc Superconductors. Journal of Superconductivity 12, 71–73 (1999). https://doi.org/10.1023/A:1007725720753
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DOI: https://doi.org/10.1023/A:1007725720753