Nonequilibrium superconductivity and quasiparticle dynamics in YBa2Cu3O7−δ
R. D. Averitt, G. Rodriguez, A. I. Lobad, J. L. W. Siders, S. A. Trugman, A. J. Taylor
DOI 10.1103/PhysRevB.63.140502 · Physical Review B
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Abstract
We have measured, using optical-pump terahertz-probe spectroscopy, the ultrafast (ab)-plane conductivity dynamics of quasiparticles and superconducting pairs in YBa2Cu3O7−δ (δ=0,0.5) thin films from 4 K to Tc. In optimally doped films, the recovery time for long-range phase-coherent pairing increases from ∼1.5 ps at 4 K to ∼3.5 ps near Tc, consistent with the closing of the superconducting gap. For underdoped films, the measured recovery time is temperature independent (3.5 ps) in accordance with the presence of a pseudogap. These results are compared to all optical pump-probe measurements at 1.5 eV.
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. | 85 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2CaCu2O8 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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