We report on tunneling spectroscopy measurements using a Scanning Tunneling Microscope (STM) on the spin triplet superconductor Sr2RuO4. We find a negligible density of states close to the Fermi level and a fully opened gap with a value of Δ=0.28 meV, which disappears at Tc = 1.5 K. Δ is close to the result expected from weak coupling BCS theory (Δ0=1.76kBTc = 0.229 meV). Odd parity superconductivity is associated with a fully isotropic gap without nodes over a significant part of the Fermi surface.
@article{arxiv.0810.4810,
title = {Nodeless spin triplet superconducting gap in Sr2RuO4},
author = {H. Suderow and V. Crespo and I. Guillamon and S. Vieira and F. Servant and P. Lejay and J. P. Brison and J. Flouquet},
journal= {arXiv preprint arXiv:0810.4810},
year = {2009}
}