Abstract
We report the substitution effect of nonmagnetic Ti4+ for Ru4+ on the in-plane resistivity of Sr2Ru1−xTixO4 with x from 0 (spin-triplet superconductor) to 0.03 (the border of the magnetically ordered phase). The superconductivity is suppressed by a small amount of Ti with x∼10−3 reflecting the extreme sensitivity to translational symmetry breaking. In addition, the in-plane residual resistivity is proportional to x in quantitative agreement with the isotropic scattering in the unitarity limit in a two-dimensional system. This indicates that the nonmagnetic impurity in Sr2RuO4 acts as a strong potential scatterer, similar to the Zn impurity in the cuprates.
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