Abstract

First, we shall review a variety of unconventional superconductors, so far identified and unidentified. It is very remarkable there are 3 nonunitary superconducting states in the list. Second, the peak in the out of plane magnetoresistance in organic superconductors, κ-(ET)2X with X=Cu(NCS)2 is analyzed in terms of the standard superconducting fluctuation theory. A similar analysis has been done by Varlamov and his coworkers on the c-axis magnetoresistance in high T c cuprate superconductors. However, unlike high T c cuprate the organic superconductors are in the clean limit. Then the peak in the out of plane magnetoresistance suggests strongly d-wave pairing in organic superconductors.

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