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The temperature dependence of far-infrared transmission gives 2Δ(0), Tc, and evidence of fluctuations in NbN films. Homogeneous and highly granular (R_=21000 Ω) NbN are found to be equally strong coupled. BCS theory predicts a peak in transmission-versus-temperature curves which is observed at a reduced level in a homogeneous sample and vanishes completely in the granular material. The extinction of the peak is ascribed to zero-dimensional fluctuations near Tc.
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Sidney Perkowitz (1982) studied this question.
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