Quantum Monte Carlo Simulations and Weak-Coupling Approximations for the Three-Band Hubbard Model

  • R. Putz
  • H. Endres
  • A. Muramatsu
  • W. Hanke
Part of the Notes on Numerical Fluid Mechanics (NNFM) book series (NONUFM, volume 48)

Summary

We study the three-band Hubbard model for the cuprate superconductors using Quantum Monte Carlo simulations and the fluctuation exchange approximation including a self-consistent many-body renormalization of the single-particle propagator. The energy dispersion of the low-lying one-particle excitations is in very good agreement with spectroscopic measurements for a hole doping concentration δ = 0.25 of the CuO2 planes. At the same doping, we examine the spin susceptibility yielding a non-ordered phase with short-range incommensurate fluctuations near the antiferromagnetic wave vector. In the superconducting regime, the interaction vertex for the pairing correlation function in the extended s-wave channel shows a maximum for δ = 0.20, resembling the dependence of transition temperature Tc on doping.

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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig/Wiesbaden 1994

Authors and Affiliations

  • R. Putz
    • 1
  • H. Endres
    • 1
  • A. Muramatsu
    • 1
  • W. Hanke
    • 1
  1. 1.Physikalisches InstitutUniversität WürzburgWürzburgGermany

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