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Superconducting Energy Gap from Infrared Response Measurements in Granular Tl2Ba2CaCu2O8 Films

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Lengfellner, Hans ; Schneider, G. ; Betz, J. ; Hogan, M. ; Prettl, Wilhelm ; Renk, Karl Friedrich
Date of publication of this fulltext: 06 Dec 2010 12:31


The resistance response of polycrystalline Tl2Ba2CaCu2O8 films to short laser pulses has been investigated for a wide range of far-infrared frequencies. For temperatures T ll Tc a drastic change in response time is observed at a critical frequency νc simeq 4 THz. The time constant increases from about 1 ns at ν < νc to 1 μs at ν > νc. The critical frequency is attributed to a superconducting energy gap with 2Δ(0)/kB Tc simeq 2.

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