Large Phase Separation and Superconductivity in the Copper Oxide Chain

1994/07/13 by C. Vermeulen, Vermeulen, C., W. Barford +3
Chemistry · Materials Science · Physics and Astronomy · #Charge density #Charge density wave #Chemistry #Condensed Matter (cond-mat) #Condensed matter physics #Copper #Copper-based nanomaterials and applications #Coulomb #Electron #Exponent #FOS: Physical sciences #Ground state #Luttinger liquid #Phase (matter) #Phase boundary #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum mechanics #Superconductivity #Surface and Thin Film Phenomena #Valence (chemistry) #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9407064

published in arXiv (Cornell University) (Cornell University)

arxiv created 1994/07/13 · openalex publication_date 1994/07/13 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The phase diagram of the copper-oxide chain as a function of density and the nearest-neighbour Coulomb interaction, V, is determined. Phase separation takes place above a critical value of V when the Cu2+ to Cu+ valence fluctuations dominate. In the proximity of the phase separation boundary the superconducting correlations are the most divergent. We identify the parameter regions where the Luttinger Liquid theory applies and calculate the contours of the charge-charge correlation exponent K_ρ. We show that anomalous flux quantization occurs as K_ρ diverges. At n = 1, for V > t, a gap opens in the spectrum and the ground state is a charge-density wave.

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