We present femtosecond time-resolved measurements on the high-Tc superconductor Tl₂{Ba}₂Ca₂{Cu}₃O₁₀. At temperatures below Tc, we observe a relaxation process which is distinct from the equilibration of hot carriers in the normal state. Our results demonstrate an increasing relaxation rate as the superconducting gap opens. This is consistent with the behavior of conventional metallic superconductors.
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Eesley et al. (1990) studied this question.
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