Why doesn't a YBaCuO superconductor get silvery when cooled down?

Alexander Dräbenstedt @Alexander-Draebenstedt

05 December 2014 0 4K Report

The YBaCuO ceramics like material looks dark brown or black no matter if insulating at room temperature or superconducting below Tc. Does that mean it is not superconducting for the high THz frequencies of optical radiation? Where is the cutoff and why?

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