We have investigated the specific heat of single crystals of the spin-triplet superconductor Sr2RuO4 (Tc0 = 1.50 K) with various Tc. We focus on the Tc dependence of the specific heat jump at Tc and of the residual specific heat coefficient. The observed behavior is not quantitatively consistent with a model with a simple isotropic gap. We argue that inclusions of both the in-plane anisotropy of the gap and the dependence of the gap on different Fermi-surface sheets are needed to resolve this discrepancy.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics