Proceedings PaperSymmetry of order parameter (pair potential) deduced from ARPES and neutron scattering
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The cluster orbitals of complexes containing (formula available in paper) ion are studied by DFT plus HF SCF method. Four different type orbitals composed of (formula available in paper) , two of them are degenerate, are found close to the Fermi level. By using these orbitals, four band models are developed, the top one has a flat energy band around the X and Y points and the next degenerate bands give a wide Fermi surface, the fourth one is fully occupied. The electronic transitions between these bands are allowed and it induces anisotropic order parameter. The symmetry of the order parameter is neither d nor s wave, but it is represented approximately by 2cosX - cosY or 2cosY - cosX. The zero-gap states are searched for the position where the node of the order parameter crosses the Fermi level. Comparison is made with experimental results of angle resolved photoemission spectra on Bi2212 and thermal neutron scattering on LSCO.