Possible superconducting symmetry on the doped J(1)-J(2) model investigated using the renormalized mean-field theory

摘要

By making use of the renormalized mean-field theory, we investigate possible superconducting symmetry in the ground states of the t(1)-t(2)-J(1)-J(2) model on a square lattice. The superconducting symmetry of ground states is determined by the frustration amplitude t(2)/t(1) and doping concentration. The phase diagram of this system in the frustration-doping plane is given. The amplitude of the pairing parameter on diagonal bonds increases with increasing value of t(2)/t(1), and ground-state change from a conventional d(x2-y2)-wave state to a mixed state, ultimately to a d(xy)-wave state. The order of the phase transitions among these different symmetry states is discussed. Copyright (C) EPLA, 2009