Abstract
Recent experiments have suggested the presence of either real or complex components in the gap symmetry of high- T c superconductors (HTSC). We introduce a novel approach to study the competition of such complex order parameter mixtures by varying the position of the two-body attractive potential in a two dimensional extended Hubbard Hamiltonian. We show that this procedure explain a number of experimental results and on the theoretical side, it may be related with the spin fluctuation theory.
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