On the Liaison Between Superconductivity and Phase Separation

Details On the Liaison Between Superconductivity and Phase Separation On the Liaison Between Superconductivity and Phase Separation

1994-07-22

arxiv.org/abs/cond-mat/9407093v1

Physics

Condensed Matter

11 pages, 9 postscript figures are appended

Scientific paper

10.1103/PhysRevB.51.5989

Models of strongly correlated electrons that tend to phase separate are studied including a long-range 1/r repulsive interaction. It is observed that charge-density-wave states become stable as the strength of the 1/r term, ${\rm V_{coul}}$, is increased. Due to this effect, the domain of stability of the superconducting phases that appear near phase separation at ${\rm V_{coul} = 0}$ is not enlarged by a 1/r interaction as naively expected. Nevertheless, superconductivity exists in a wide region of parameter space, even if phase separation is suppressed. Our results have implications for some theories of the cuprates.

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