PSEUDOGAP PHENOMENA AND THE DENSITY WAVES IN HIGH-Tc CUPRATES

Abstract

We consider the density waves as possible explanations for the pseudogap in high temperature cuprate superconductors. Both the conventional spin density wave (SDW) and the unconventional d-density waves are considered in our study using a mean-field calculation of the tight binding model including terms upto second nearest neighbor hopping (γ). The phase diagrams for the order parameter and temperature with doping in the above types of density waves are discussed. The d-SDW does not coexist with the superconducting gap when studied with doping whereas the d-charge density wave (DDW) shows a state of coexistence. The temperature dependence of the order parameter and specific heat is also demonstrated. The spectral function of the SDW is also considered for various temperatures and doping.