Phase Diagram of High-T_c Superconductors from a Field Theory Model
  The renormalization group approach to correlated fermions is used to determine the phase diagram of the oxide cuprates modeled by the t-t' Hubbard model at the Van Hove filling. Spin-dependent interactions give rise to instabilities corresponding to ferromagnetic, antiferromagnetic and d-wave superconducting phases. Antiferromagnetism and d-wave superconductivity arise from the same interactions, and compete in the same region of parameter space. 
J. V. Alvarez, J. Gonzalez, F. Guinea and M. A. H. Vozmediano