High-T-c phase diagram based on the SU(2) slave-boson approach to the t-J Hamiltonian - art. no. 052501

Based on an improved SU(2) slave-boson approach showing coupling between th e charge and spin degrees of freedom, we derive a phase diagram of high-T-c cuprates which displays both the superconducting and pseudogap phases in t he plane of temperature vs hole doping rate. It is shown that phase fluctua tions in the order parameters result in a closer agreement with the observe d phase diagram of an arch shape, by manifesting the presence of an optimal doping rate closer to observation, compared to the U(1) slave-boson theory .