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Reference.org
Type-II superconductor
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<p>In <a href="/facts/Superconductivity/pqQAlSzJ">superconductivity</a>, a type-II superconductor is a superconductor that exhibits an intermediate phase of mixed ordinary and superconducting properties at intermediate temperature and fields above the superconducting phases. It also features the formation of <a href="/facts/Abrikosov_vortex/6yP83ySP">magnetic field vortices</a> with an applied external <a href="/facts/Magnetic_field/Ta8Ev588">magnetic field</a>. This occurs above a certain critical field strength <i>Hc1</i>. The vortex density increases with increasing field strength. At a higher critical field <i>Hc2</i>, superconductivity is destroyed. Type-II superconductors do not exhibit a complete <a href="/facts/Meissner_effect/VJLdDzzE">Meissner effect</a>. </p>