Type I Superconductor
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High Quality Content by WIKIPEDIA articles! Superconductors cannot be penetrated by magnetic flux lines (Meissner-Ochsenfeld effect). This Meissner effect breaks down when the applied magnetic field is too large. Superconductors can be divided into two classes according to how this breakdown occurs. In Type I superconductors, superconductivity is abruptly destroyed when the strength of the applied field rises above a critical value Hc. As such, they have only a single critical temperature at which the material ceases to superconduct, becoming resistive. Depending on the geometry of the sample,...
High Quality Content by WIKIPEDIA articles! Superconductors cannot be penetrated by magnetic flux lines (Meissner-Ochsenfeld effect). This Meissner effect breaks down when the applied magnetic field is too large. Superconductors can be divided into two classes according to how this breakdown occurs. In Type I superconductors, superconductivity is abruptly destroyed when the strength of the applied field rises above a critical value Hc. As such, they have only a single critical temperature at which the material ceases to superconduct, becoming resistive. Depending on the geometry of the sample, one may obtain an intermediate state consisting of a baroque pattern of regions of normal material carrying a magnetic field mixed with regions of superconducting material containing no field.The origin of their superconductivity is explained by BCS theory. Elementary superconductors, such as aluminium and lead are typical Type I superconductors.
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