Phase separation and the existence of superconductivity in a one-dimensional copper-oxygen model

Details Phase separation and the existence of superconductivity in a one-dimensional copper-oxygen model Phase separation and the existence of superconductivity in a one-dimensional copper-oxygen model

1996-03-11

arxiv.org/abs/cond-mat/9603076v1

Physics

Condensed Matter

11 pages, RevTex, 5 Postscript figures

Scientific paper

10.1103/PhysRevB.54.R3746

The phase separation instability occurring with increasing nearest-neighbor repulsion V in a two-band Hubbard model (CuO chain) is discussed. Quantum Monte Carlo simulations indicate that this transition is associated with a level-crossing if the filling fraction is close to 1 (half-filled lower band). Spin-density-wave fluctuations then dominate before phase separation. Superconducting fluctuations dominate only at considerably higher doping levels.

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