Superconductors

There are type 1 and type 2 superconductors.

The Type 1 category of superconductors is mainly comprised of metals and metalloids that show some conductivity at room temperature.

Except for the elements vanadium, technetium and niobium, the Type 2 category of superconductors is comprised of metallic compounds and alloys.

You should visit the website which is on superconductors for beginners