Interplanar coupling, induced superconductivity, and van Hove singularity in high-{ital T}{sub {ital c}} cuprates
- The New Zealand Institute for Industrial Research, P. O. Box 31310, Lower Hutt (New Zealand)
- Fakultaet fuer Physik, Universitaet Konstanz, D-78434 Konstanz (Germany)
- Interdisciplinary Research Centre in Superconductivity, Cambridge University, Cambridge, CB3OHE (United Kingdom)
The interplanar coupling between the superconducting CuO{sub 2} planes in {ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} is controlled by changing the size of the rare earth and by changing the oxygen deficiency in the chains while keeping the hole concentration on the planes fixed at optimum doping by means of Ca substitution on the {ital R} site. The irreversibility field {ital H}{sub irr}({ital T}), thermopower, penetration depth from muon spin rotation, and the {ital c}-axis coherence length from fluctuation conductivity all indicate superconductivity extends onto the CuO{sub 1{minus}{delta}} chains by the proximity effect, giving an increased interlayer coupling equivalent to a halving of the interplanar distance. The insensitivity of {ital T}{sub {ital c}} to interlayer coupling and the absence of a peak in the density of states determined from Y NMR seriously erodes the van Hove singularity scenario for the high-{ital T}{sub {ital c}} cuprates. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 283925
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 18; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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