Model for phase separation controlled by doping and the internal chemical pressure in different cuprate superconductors

2008/09/30 by K. I. Kugel, K. I. Кugel, A. L. Rakhmanov +4 · 6 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.78.165124

published as Phys. Rev. B 78, 165124 (2008) · 8 pages, 5 figures, submitted to Phys. Rev. B

arxiv created 2008/10/25 · openalex publication_date 2008/10/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In the framework of a two-band model, we study the phase-separation regime of different kinds of strongly correlated charge carriers as a function of the energy splitting between the two sets of bands. The narrow (wide) band simulates the more localized (more delocalized) type of charge carriers. By assuming that the internal chemical pressure on the CuO₂ layer due to interlayer mismatch controls the energy splitting between the two sets of states, the theoretical predictions are able to reproduce the regime of phase separation at doping higher than 1/8 in the experimental pressure-doping-T_c phase diagram of cuprates at large microstrain as it appears in overoxygenated La₂CuO₄.

Citations

• Electron correlations in narrow energy bands

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