Superconductor Classification
Superconductors can be classified in accordance with several criteria that depend on physical properties, current understanding, and the expense of cooling them or their material. By their magnetic properties * Type I superconductors: those having just one critical field, ''Hc'', and changing abruptly from one state to the other when it is reached. * Type II superconductors: having two critical fields, ''Hc1'' and ''Hc2'', being a perfect superconductor under the lower critical field (''Hc1'') and leaving completely the superconducting state to a normal conducting state above the upper critical field (''Hc2''), being in a mixed state when between the critical fields. * By the understanding we have about them * Conventional superconductors: those that can be fully explained with the BCS theory or related theories. * Unconventional superconductors: those that failed to be explained using such theories, e.g.: **Heavy fermion superconductors This criterion is important, a ...
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