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I think that the statement is incorrect. BCS theory explains that attraction between electrons leads to superconductivity. This applies to all Type I superconductors and to some Type II superconductors. Which Type II? alloys of metals but not high temperature superconductors (such as cuprates). TomyDuby ( talk) 04:29, 12 July 2008 (UTC) reply

Merging proposal deleted as discussed on the corresponding pages. "Conventional" has nothing to do with "type-I". "BCS superconductor" is appropriate, but there is a nice symmetry between "conventional supercondtor" and "unconventional supercondtor", and there is no good alternative for the latter. The discussed aritcles should gradually evolve from stubs to GAs. NIMSoffice ( talk) 04:26, 2 February 2009 (UTC) reply