Abstract
We report the substitution effect of nonmagnetic Ti4+ for Ru4+ on the specific heat of Sr2Ru1−xTixO4 from x=0 (spin-triplet superconductor) to 9% (magnetically ordered phase with glassy behavior) via magnetic instability point at xc∼2.5%. We found that specific heat divided by temperature CP/T around xc deviates from the conventional Fermi liquid behavior seen in pure Sr2RuO4 and shows the logarithmic behavior at xc. Such critical enhancement is attributable to the diverging two-dimensional antiferromagnetic fluctuation, which arises mainly from the nesting within one of the three Fermi-surface sheets.
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