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The resistance response of polycrystalline Tl 2 Ba 2 CaCu 2 O 8 films to short laser pulses has been investigated for a wide range of far-infrared frequencies. For temperatures T ≪ T c a drastic change in response time is observed at a critical frequency ν c ≃ 4 THz. The time constant increases from about 1 ns at ν < ν c to 1 μs at ν > ν c . The critical frequency is attributed to a superconducting energy gap with 2Δ(0)/k B T c ≃ 2.
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Lengfellner et al. (1991) studied this question.
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