Optical measurements on oriented thin YBa2Cu3O7−δ films: Lack of evidence for excitonic superconductivity
I. Bozovic, D. Kirillov, A. Kapitulnik, K. Char, M. R. Hahn, M. R. Beasley, T. H. Geballe, Y. H. Kim, A. J. Heeger
DOI 10.1103/PhysRevLett.59.2219 · Physical Review Letters
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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-Tc superconductivity in cuprates could arise from exciton-mediated electron pairing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
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