Femtosecond optical detection of quasiparticle dynamics in high-Tc YBa2Cu3O7−δ superconducting thin films
S. G. Han, Z. V. Vardeny, K. S. Wong, O. G. Symko, G. Koren
DOI 10.1103/PhysRevLett.65.2708 · Physical Review Letters
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Abstract
Femtosecond dynamics of photogenerated quasiparticles in YBa2Cu3O7−δ superconducting thin films shows, at T≤Tc, two main electronic processes: (i) quasiparticle avalanche production during hot-carrier thermalization, which takes about 300 fsec; (ii) recombination of quasiparticles to form Cooper pairs, which is completed within 5 psec. In contrastr, nonsuperconducting epitaxial films such as PrBa2Cu2O7 and YBa2Cu3O6 show regular picosecond electronic response.
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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