Optical measurements on oriented thin films: Lack of evidence for excitonic superconductivity
- 9 November 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 59 (19), 2219-2221
- https://doi.org/10.1103/physrevlett.59.2219
Abstract
Optical transmission and reflection spectra (mid IR through uv) and Raman spectra of superior-quality 90-, 180-, 400-, and 1000-nm-thick superconducting Y-Ba-Cu-O films are reported. Characteristic excitonic bands, and in particular the absorption band at ≃0.37 eV reported earlier, are not observed. It therefore seems unlikely that the high- superconductivity in cuprates could arise from exciton-mediated electron pairing.
Keywords
This publication has 13 references indexed in Scilit:
- Excitonic absorption and superconductivity inPhysical Review Letters, 1987
- Normal-state gap transition in Cu-O superconductorsPhysical Review B, 1987
- Charge transfer excitations and superconductivity in “ionic” metalsSolid State Communications, 1987
- Theory of high-superconductivity in oxidesPhysical Review Letters, 1987
- Topology of the resonating valence-bond state: Solitons and high-superconductivityPhysical Review B, 1987
- Plasmons and high-temperature superconductivity in alloys of copper oxidesPhysical Review B, 1987
- Critical temperatures of superconductors with low dimensionalityPhysical Review B, 1987
- The Resonating Valence Bond State in La 2 CuO 4 and SuperconductivityScience, 1987
- Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressurePhysical Review Letters, 1987
- Possible highT c superconductivity in the Ba?La?Cu?O systemZeitschrift für Physik B Condensed Matter, 1986