抄録
We measured the specific heat of single crystals of non-cuprate layered perovskite superconductor Sr2RuO4. The crystals with different Tc up to 1.2, K exhibit a large residual electronic coefficient γ0, which decreases systematically with increasing Tc. This behavior is consistent with the presence of nodes in the superconducting gap and with the variations of Tc due to pair breaking by impurities and defects. To quantitatively account for the observed large γ0, however, we need to introduce additional mechanism.
