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11 October 2000 Comparison of AC laser calorimeter measurements with FTIR measurements of superconductors
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The temperature dependence of the absorption of the thick niobium films was measured using an AC far-infrared laser calorimeter. Moreover the temperature and frequency dependences of the absolute transmission and reflection of same thin niobium nitride films were measured from 5 to 20 K and from 10 to 200 cm-1 using a fourier transform infrared spectrometer. The temperature dependencies of the skin depth and the absorptance determined independently by both methods are compared. However the skin depths and the absorptances agree well each other near and above Tc, they begin to deviate from each other with decreasing temperature below Tc.
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Etsuo Kawate, Mitsuo Koguchi, Zhen Wang, Yoshinori Uzawa, and Kohtaro Isida "Comparison of AC laser calorimeter measurements with FTIR measurements of superconductors", Proc. SPIE 4103, Optical Diagnostic Methods for Inorganic Materials II, (11 October 2000);

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