As you increase the temperature or strength of the magnetic field applied to a superconducting material, at some point that superconductivity will break down—and therein lies the the main difference between Type I and Type II superconductors. Type I superconductors, usually metals or metalloids, lose their superconducting properties and return to a “normal” state at a specific critical field level (Hc). Type II superconductors, often alloys or complex oxide ceramics, exhibit a sort of buffer phase (or mixed state), in which there are two critical field thresholds.
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