Superconductors are unique in that they show perfect diamagnetism, a phenomenon known as the Meissner effect, which is absent in other materials like semiconductors or conductors.
Diamagnetic materials are those which are repelled by a magnetic field. Superconductors exhibit perfect diamagnetism, meaning they expel all magnetic fields when cooled below a certain temperature, which is why they are considered one of the most exotic diamagnetic materials.