Superconductivity in zigzag CuO chains
Erez Berg, Theodore H. Geballe, Steven A. Kivelson
DOI 10.1103/PhysRevB.76.214505 · Physical Review B
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Abstract
Superconductivity has recently been discovered in Pr2Ba4Cu7O15−δ with a maximum Tc of about 15K. 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 C1S3∕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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
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