Enhancement of Cu-O vibrational modes and superconductivity in YBa2Cu3O7−δ studied by x-ray photoelectron spectroscopy and high-resolution electron-energy-loss spectroscopy
Y. Fukuda, M. Nagoshi, T. Suzuki, Y. Namba, Y. Syono, M. Tachiki
DOI 10.1103/PhysRevB.39.2760 · Physical Review B
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Abstract
We find peaks around 60 meV (∼484 cm−1) in high-resolution electron-energy-loss spectroscopy spectra for ortho- and tetra-YBa2Cu3O7−δ. It is found that the peak intensity for superconductors (ortho-Y-Ba-Cu-O) is strongly enhanced as compared with nonsuperconductors (tetra-Y-Ba-Cu-O). From these results, it is suggested that this enhancement is due to the strong coupling of phonons with charge fluctuations.
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 unresolved | zero_resistance |
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