Extremely Strong Dependence of Superconductivity on Disorder in Sr2RuO4

A. P. Mackenzie; R. K. W. Haselwimmer; A. W. Tyler; G. G. Lonzarich; Y. Mori; S. Nishizaki; Y. Maeno

doi:10.1103/PhysRevLett.80.161

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Extremely Strong Dependence of Superconductivity on Disorder in Sr2RuO4

A. P. Mackenzie, R. K. W. Haselwimmer, A. W. Tyler, G. G. Lonzarich, Y. Mori, S. Nishizaki, Y. Maeno

DOI 10.1103/PhysRevLett.80.161 · Physical Review Letters

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Abstract

A key signature of unconventional or non- s-wave superconductivity is a strong suppression of Tc 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 1μΩcm, 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.35	Pressure not reported	midpoint