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Schlagwörter:
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Zusammenfassung:
We report comparative substitution effects of nonmagnetic Ti4+ and
magnetic Ir4+ impurities for Ru4+ in the spin-triplet superconductor
Sr2RuO4. We found that both impurities suppress the superconductivity
completely at a concentration of approximately 0.15%, reflecting the
high sensitivity to translational symmetry breaking in Sr2RuO4. In
addition, a rapid enhancement of residual resistivity is in quantitative
agreement with unitarity-limit scattering. Our result suggests that both
nonmagnetic and magnetic impurities in Sr2RuO4 act as strong potential
scatterers. The behavior observed in Sr2RuO4 is similar to that of the
nonmagnetic (Zn2+) impurity in the high-T-c cuprates, but different from
that of the magnetic (Ni2+) impurity.
