Cuprates and ruthenates: Similarities and differences

There is growing evidence that the p-wave superconductivity of Sr2RuO4 occurs primarily in the planar gamma-band. Thus the minimum model for both cuprates and ruthenates is a single active band with onsite Coulomb interactions. Recent renormalization group analysis shows that such a model can show singlet d-wave or triplet p-wave pairing. The energy of the van, Hove singularity in the band and the shape of the Fermi surface are the decisive factors at weak to moderate interaction strengths.