Phase Diagram of High-Tc Superconductors from a Field Theory Model
J. V. Alvarez, J. Gonzalez, F. Guinea, M. A. H. Vozmediano
Abstract
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.
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