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Abstract:
A key signature of unconventional or non-s-wave superconductivity is a
strong suppression of T-c, by nonmagnetic as well as by magnetic
impurities. We report measurements of chemical composition and of
transport properties in the same single crystals of Sr2RuO4 which show
that nonmagnetic impurities destroy superconductivity when the residual
resistivity exceeds 1 mu Omega cm, i.e., when the carrier mean free path
falls below the superconducting coherence length. This behavior strongly
supports models of non-s-wave (e.g., p-or d-wave) pairing in this
layered perovskite oxide.
