Model for phase separation controlled by doping and the internal chemical pressure in different cuprate superconductors
2008; American Physical Society; Volume: 78; Issue: 16 Linguagem: Inglês
10.1103/physrevb.78.165124
ISSN1550-235X
AutoresK. I. Кugel, A. L. Rakhmanov, A. O. Sboychakov, Nicola Poccia, A. Bianconi,
Tópico(s)Advanced Condensed Matter Physics
ResumoIn 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 ${\text{CuO}}_{2}$ 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 ${\text{La}}_{2}{\text{CuO}}_{4}$.
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