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The transient electronic response of epitaxially grown YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor thin films in the femtosecond time domain was investigated using transient photoinduced reflectivity ( Delta R) with 60-fs time resolution. For temperatures T>T/sub c/, only a bolometric signal was observed with Delta R>0. For T0. The results for T<T/sub c/ are explained in terms of quasi-particle (QP) electronic response giving Delta R<0. Thus, the femtosecond rise time is interpreted as avalanche multiplication of QP across the gap 2 Delta , and the subsequent picosecond relaxation is interpreted as QP recombination. The QP optical response is explained within the framework of the two-fluid model.
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Han et al. (1991) studied this question.
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