paper

Incorporation of charge- and pair-density-wave states into the one-band model of d-wave superconductivity

arXiv:1805.11443 · doi:10.1103/PhysRevB.98.155144

Abstract

We study the coexistence of pair- (PDW) and charge-density-wave (CDW) states within the single-band -- and Hubbard models of - superconductivity and discuss our results in the context of the experimental observations for the copper-based compounds. In order to take into account the correlation effects with a proper precision, we use the approach based on the diagrammatic expansion of the Gutzwiller wave function (DE-GWF), that goes beyond the renormalized mean field theory (RMFT) in a systematic manner. According to our analysis of the -- model, the transition between the pure - superconducting phase (SC) and the coexistent CDW+PDW phase takes place at (close to the optimal doping), with the modulated phase located in the underdoped regime. The situation is slightly different for the case of the Hubbard model, where a narrow stability regime of a precursor nematic phase sets in preceding the formation of the modulated CDW+PDW state, with the decreasing hole doping. The results complete our discussion of the standard phase diagram for high-T superconducting compounds within the DE-GWF variational approach in the single narrow-band case.

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