Phase diagram of hole-doped high-Tc superconductors: Effects of Cooper-pair phase fluctuations within fluctuation-exchange theory - art. no. 144520

Using the Hubbard model Hamiltonian we study spin-fluctuation exchange-indu ced superconductivity of d-wave symmetry. Results are presented for the cha racteristic temperature T* at which a gap appears in the spectral density, for T*(c) at which Cooper-pairs are formed, for T-c at which Cooper pairs b ecome phase coherent, and for the superfluid density n(s). We find that, wi th increasing doping, for x>0.15 the phase coherence energy becomes larger than the Cooper-pair condensation energy. Accordingly, one has T(c)proporti onal ton(s) for x<0.15 and T-c<proportional to>Delta for the overdoped cupr ates. We use our results to discuss dynamics and recent dynamical conductiv ity and ultrafast nonequilibrium measurements.