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Superconductivity in zigzag CuO chains

Superconductivity in zigzag CuO chains Superconductivity has recently been discovered in Pr 2 Ba 4 Cu 7 O 15 − δ with a maximum T c of about 15 K . Since the CuO planes in this material are believed to be insulating, it has been proposed that the superconductivity occurs in the double (or zigzag) CuO chain layer. On phenomenological grounds, we propose a theoretical interpretation of the experimental results in terms of a phase for the zigzag chain, labeled by C 1 S 3 ∕ 2 . This phase has a gap in the relative charge mode and a partial gap in the relative spin mode. It has gapless uniform charge and spin excitations and can have a divergent superconducting susceptibility, even for repulsive interactions. A microscopic model for the zigzag CuO chain is proposed, and on the basis of density matrix renormalization group and bosonization studies, we adduce evidence that supports our proposal. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Superconductivity in zigzag CuO chains

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References (4)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2007 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.76.214505
Publisher site
See Article on Publisher Site

Abstract

Superconductivity has recently been discovered in Pr 2 Ba 4 Cu 7 O 15 − δ with a maximum T c of about 15 K . Since the CuO planes in this material are believed to be insulating, it has been proposed that the superconductivity occurs in the double (or zigzag) CuO chain layer. On phenomenological grounds, we propose a theoretical interpretation of the experimental results in terms of a phase for the zigzag chain, labeled by C 1 S 3 ∕ 2 . This phase has a gap in the relative charge mode and a partial gap in the relative spin mode. It has gapless uniform charge and spin excitations and can have a divergent superconducting susceptibility, even for repulsive interactions. A microscopic model for the zigzag CuO chain is proposed, and on the basis of density matrix renormalization group and bosonization studies, we adduce evidence that supports our proposal.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Dec 1, 2007

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