journal article·1993-08

Dynamics of optically excited quasiparticles in YBa2Cu3O7

W. Albrecht, Th. Kruse, K. Leo, H. Kurz

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OpenAlex topics: Physics of Superconductivity and Magnetism · Superconducting and THz Device Technology · Superconductivity in MgB2 and Alloys

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References (29)

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18. The 50 fs laser pulses are broadened to about 80 fs due to dispersion in the cryostat windows
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20. The traces have a weak modulation caused by the excitation of coherent phonon oscillations, which have been discussed elsewhere [W. Albrecht, T. Kruse, H. Kurz: Phys. Rev. Lett. 69, 1451 (1992)]. Coherent phonon oscillations have also been observed in non-superconducting YBa2Cu3O7-? [J.M. Chwalek, et al.: Appl. Phys. Lett. 58, 980 (1991)]
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23. A similar inversion is observed for lower laser energies
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25. The fit exhibits only a weak dependence on ?b, thus limiting its accuracy. However, the value of 10 fs is in reasonable agreement with the theoretical expectation of 57 fs, as calculated in [7] from the theory of [3]. The estimated error of the other fit parameters is about 30%. The overall precision is obviously strongly dependent on the estimated density of photogenerated QP
26. Eesley, et al. [16] obtain in Tl2Ba2Ca2Cu3O10 a density-independent behavior at comparable QP densities. The reason for this discrepancy to our results is not clear.
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