Nodeless superconductivity in cuprates with Ba2CuO3-type structure

In this work, zero-temperature phase diagrams of cuprates with Ba2CuO3-type CuO chain structure are investigated. The projective symmetry group analysis is employed in the strong coupling limit, and the one-loop renormalization group with bosonization analysis is employed in the weak coupling limit. We find that in both of these two limits, large areas of the phase diagrams are filled with nodeless superconducting phases, instead of nodal d-wave phase mostly found in cuprates. This implies that nodeless superconducting phases are the dominant superconducting phases in cuprates with Ba2CuO3-type CuO chain structure in low temperature. Other phases are also found, including nodal superconducting phases and Luttinger liquid phases.