Doping-induced symmetry change of superconducting order

Superconductivity in doped cuprate compounds can be associated with different microscopic mechanisms: Coulomb, phonon- and magnon-mediated pairing. These mechanisms simultaneously contribute into superconducting order and their competition determines the symmetry of the order parameter. The magnon-mediated pairing is strongly dependent on doping, therefore, one can expect a change of the symmetry of the order parameter under variation of doping that can result in phase transitions inside the superconducting state.