초반자성: 두 판 사이의 차이

"Screening currents" also appear in a situation wherein an initially normal, conducting metal is placed inside a magnetic field. As soon as the metal is cooled below the appropriate transition temperature, it becomes superconducting. This expulsion of magnetic field upon the cooling of the metal cannot be explained any longer by merely assuming [[zero]] resistance and is called ''the [[Meissner effect]]''. It shows that the superconducting state does not depend on the history of preparation, only upon the present values of [[temperature]], [[pressure]] and magnetic field, and therefore is a true thermodynamic state.

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