The A15 phases are series of intermetallic compounds with the chemical formula A3B (where A is a transition metal and B can be any element) and a specific structure. Many of these compounds have superconductivity at around 20 K (-424°F), which is comparatively high and also in magnetic fields of tens of teslas (hundreds of kilogauss). This kind of superconductivity is an important area of study as it has several practical applications.
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