Flux quantization and pairing in one-dimensional copper-oxide models

A. Sudbø, C. M. Varma, T. Giamarchi, E. B. Stechel, R. T. Scalettar

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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 languageEnglish
Pages (from-to)978-981
Number of pages4
JournalPhysical review letters
Volume70
Issue number7
DOIs
Publication statusPublished - Jan 1 1993

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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