Time-resolved observation of coherent phonons in superconducting YBa2Cu3O7−δ thin films
W. Albrecht, Th. Kruse, H. Kurz
DOI 10.1103/PhysRevLett.69.1451 · Physical Review Letters
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Abstract
We report the observation of coherent optical phonons at 120 and 150 cm−1 in superconducting YBa2Cu3O7−δ (δ<0.1) thin films. These phonons are excited by femtosecond laser pulses and observed by distinct oscillations of the reflectivity signal in real time. Below the transition temperature Tc the amplitude of the Ba mode at 120 cm−1 increases drastically in close correlation to the density of optically excited quasiparticles. The dephasing times of the coherent Ba and Cu(2) vibrations exhibit sharp increases below Tc excluding a ‘‘second’’ smaller gap below 150 cm−1.
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. | 92 | Pressure not reported | onset |
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