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Gap and pseudogap evolution within the charge-ordering scenario for superconducting cuprates

  • L. Benfatto
  • S. Caprara
  • C. Di Castro
Article

Abstract:

We describe the spectral properties of underdoped cuprates as resulting from a momentum-dependent pseudogap in the normal-state spectrum. Such a model accounts, within a BCS approach, for the doping dependence of the critical temperature and for the two-parameter leading-edge shift observed in the cuprates. By introducing a phenomenological temperature dependence of the pseudogap, which finds a natural interpretation within the stripe quantum-critical-point scenario for high- Tc superconductors, we reproduce also the Tc – T* bifurcation near optimum doping. Finally, we briefly discuss the different role of the gap and the pseudogap in determining the spectral and thermodynamical properties of the model at low temperatures.

PACS. 74.25.Dw Superconductivity phase diagrams - 71.10.Hf Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems - 74.20.Fg BCS theory and its development 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • L. Benfatto
    • 1
  • S. Caprara
    • 1
  • C. Di Castro
    • 1
  1. 1.Dipartimento di FisicaUniversità di Roma “La Sapienza”RomaItaly

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