Analysis of self-organization processes among the hole states in cuprates and the features of their manifestation in YBa2Cu3O6+δ

Abstract

A string model proposed previously, based on the concept of quasi-one-dimensional correlations in the overlapping 2p shells of the oxygen sublattice, is used to analyze the influence of self-organization processes in the hole community on the evolution of the electronic properties of cuprates as the doping level is increased. The proposed scenario implies, in particular, that the formation of bosonic stripes within bunches of fermion-like hole excitations in the cuprates should be reflected in their electron spectra, first in the form of bulges and then in the form of coherent peaks adjacent to humps of incoherent origin on the low-energy side. In light of the approaches developed, the central thrust is to ascertain the specifics of the ordering of hole states in the compounds YBa2Cu3O6+δ, where, owing to alignment of the basal oxygen into chains, more favorable conditions can be created for the formation of a frustrated network of superconducting nanochannels consisting of second-rank bosonic stripes, which can maintain stability at temperatures up to 1200K at δ≈0.22. It is shown that the theoretical results, calculated without recourse to adjustable parameters, are in good agreement with the results of measurements for the main characteristics of the electron spectra of the cuprates.