Superconducting Energy Gap from Infrared Response Measurements in Granular Tl2Ba2CaCu2O8 Films
- Lengfellner, Hans
- Schneider, G.
- Betz, J.
- Hogan, M.
- Prettl, Wilhelm
- Renk, Karl Friedrich
DOIAbstract
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. The critical frequency is attributed to a superconducting energy gap with 2Δ(0)/kB Tc simeq 2
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