### Abstract

We obtain the ground-state energy E0() exactly as a function of flux in a one-dimensional copper-oxide model on rings of finite circumference L, including on-site interactions and a nearest-neighbor interaction V. For V of the order of the charge-transfer gap or larger, the model extrapolated to large L exhibits flux quantization with charge 2e, and a slow algebraic decay of the singlet superconducting correlation function on oxygen sites. The extrapolated superfluid stiffness appears, however, finite only for not too large V. These results suggest a superconductive state at V of order the charge-transfer gap of the model, but a paired and phase-separated state at larger V.

Original language | English |
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Pages (from-to) | 978-981 |

Number of pages | 4 |

Journal | Physical review letters |

Volume | 70 |

Issue number | 7 |

DOIs | |

Publication status | Published - Jan 1 1993 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Physical review letters*,

*70*(7), 978-981. https://doi.org/10.1103/PhysRevLett.70.978