Phase separation and the existence of superconductivity in a one-dimensional copper-oxygen model
A. W. Sandvik, A. Sudbø
DOI 10.1103/PhysRevB.54.R3746 · Physical Review B
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Abstract
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 strongly discontinuous if the filling fraction 〈n〉 is close to 1 (half-filled lower band). Spin-density-wave fluctuations then dominate before phase separation. Superconducting fluctuations dominate in the neighborhood of phase separation only at considerably higher doping levels, where the transition to the phase-separated state is much smoother.
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