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Sethna, Superheating field of superconductors within Ginzburg-Landau theory, Physical Review B, 2011","review_link":"https://doi.org/10.1103/PhysRevB.83.094505","review_verified":"true","summary":"A superconductor can keep magnetic field out somewhat beyond the field at which entering becomes energetically favorable, up to the superheating field, before vortices (tiny whirlpools of current carrying magnetic flux) enter. 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