Question

What do you mean by super conductor???
which transition metal oxide has appearance and conductivity like copper??

Answer 1

A superconductor is a material that can conduct electricity or transport electrons from one atom to another with no resistance. This means no heat, sound or any other form of energy would be released from the material when it has reached "critical temperature" (T_c), or the temperature at which the material becomes superconductive. Unfortunately, most materials must be in an extremely low energy state (very cold) in order to become superconductive. Research is underway to develop compounds that become superconductive at higher temperatures. Currently, an excessive amount of energy must be used in the cooling process making superconductors inefficient and uneconomical.

Rhenium Oxide(Reo_3) is the is the transition metal oxide which has similar conductivity and appearance as that of metallic copper.