Temperature dependence of the linewidths of the Raman-active phonons of YBa2Cu3O7: Evidence for a superconducting gap between 440 and 500 cm−1
K. F. McCarty, H. B. Radousky, J. Z. Liu, R. N. Shelton
DOI 10.1103/PhysRevB.43.13751 · Physical Review B
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Abstract
The linewidths and frequencies of three Raman-active phonons have been measured in twin-free single crystals of YBa2Cu3O7. Below Tc, the phonon at 340 cm−1 sharpens dramatically, the phonon at 440 cm−1 sharpens slightly, and the phonon at 500 cm−1 broadens. The temperature dependence of the phonon linewidths places the superconducting energy gap (2Δ) between 440 and 500 cm−1, or 2Δ=6.8kBTc–7.7kBTc. Based upon the observed change in linewidth, the electron-phonon coupling strength of the 340-cm−1 phonon is estimated to be between 0.6 and 0.8.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd2-xCexCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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