Low Temperature Physics: 33, 245 (2007); https://doi.org/10.1063/1.2719962 (12 pages)
Fizika Nizkikh Temperatur: Volume 33, Number 2-3 (February 2007), p. 328-347    ( to contents , go back )

Analysis of self-organization processes amid hole states in cuprates and peculiarities of their manifestations in YBa2Cu3O6+d

A.V. Mitin

Kapitza Institute of Physical Problems RAS, 2 Kosygina st., Moscow 119334, Russia
E-mail: mitin@kapitza.ras.ru
pos Анотація:

Received September 7, 2006

Abstract

The previous string model based on the concept of quasi-one-dimensional correlations along the overlapping 2p-shells in the oxygen sublattice is used to analyze the effect of self-organization amid hole community in cuprates on evolution of their physical properties with increasing the doping level. In particular, the scenario considered permits us to suggest that the formation of boson stripes within the bunches of fermion-like hole excitations manifests itself in the electronic spectra first as bulges and then as coherent peaks adjacent to lower-energy humps of incoherent origin. In the light of the approaches developed most attention is given to revealing a specific ordering of the hole states in the YBa2Cu3O6+d compound, where the basal oxygen can be arranged into chains and therefore the most favorable conditions may be realized for emerging a frustrated network of superconducting nanochannels composed of the second-rank boson stripes, the later being able to retain their stability over a temperature range up to 1200 K at d ≈ 0.22. It is shown that the main characteristics of the cuprate electronic spectra calculated without any application of adjustable parameters are in good agreement with experimental data.

PACS: 74.20.Mn Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.);
PACS: 74.25.Jb Electronic structure;
PACS: 74.72.–h Cuprate superconductors.

Key words: cuprates, pseudogap, bosonic stripes, superconductivity.

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