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

We obtain the ground-state energy [ital E][sub 0]([Phi]) exactly as a function of flux [Phi] in a one-dimensional copper-oxide model'' on rings of finite circumference [ital L], including on-site interactions and a nearest-neighbor interaction [ital V]. For [ital V] of the order of the cha...

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Bibliographic Details
Published in:Physical review letters 1993-02, Vol.70 (7), p.978-981
Main Authors: SUDBØ, A, VARMA, C. M, GIAMARCHI, T, STECHEL, E. B, SCALETTAR, R. T
Format: Article
Language:English
Subjects:
360207 > Ceramics, Cermets, & Refractories-- Superconducting Properties-- (1992-)
BAND THEORY
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: electronic structure, electrical, magnetic, and optical properties
CORRELATIONS
ELECTRONIC STRUCTURE
Exact sciences and technology
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
INTERACTIONS
MAGNETIC FLUX
MATERIALS SCIENCE
ONE-DIMENSIONAL CALCULATIONS
PAIRING INTERACTIONS
PHASE TRANSFORMATIONS
Physics
QUANTIZATION
Superconductivity
SUPERCONDUCTORS
Theory and models of superconducting state
VARIATIONS 665411 > Basic Superconductivity Studies-- (1992-)
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Summary:We obtain the ground-state energy [ital E][sub 0]([Phi]) exactly as a function of flux [Phi] in a one-dimensional copper-oxide model'' on rings of finite circumference [ital L], including on-site interactions and a nearest-neighbor interaction [ital V]. For [ital V] of the order of the charge-transfer gap or larger, the model extrapolated to large [ital L] exhibits flux quantization with charge 2[ital e], 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 [ital V]. These results suggest a superconductive state at [ital V] of order the charge-transfer gap of the model, but a paired and phase-separated state at larger [ital V].
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.70.978