When a compound exhibits this property, it will expel any internal magnetic field, which is called the Meissner Effect.  
SQUIDs take advantage of this property to detect very weak magnetic fields, and an incorrect EE Times article claimed that Silane had this property at room temperature, though YBCO was the first material found to exhibit this property above the boiling point of (*) nitrogen. When a compound exhibits this property, it will expel any internal magnetic field, which is called the Meissner Effect.  For ten points, name this phenomenon, where at low enough temperatures, a substance's resistance drops to zero.
SQUIDs take advantage of this property to detect very weak magnetic fields, and an incorrect EE Times article claimed that Silane had this property at room temperature, though YBCO was the first material found to exhibit this property above the boiling point of (*) nitrogen.
{Superconductivity} (accept word forms like {Superconductor})