Abstract
We report magnetic penetration depth and thermal-conductivity data for high-quality single crystals of which provide strong evidence that this material has line nodes in its energy gap. This is distinctly different from the nodeless gap found for which has similar and phase diagram. Our results indicate that repulsive electronic interactions play an essential role for Fe-based high- superconductivity but that uniquely there are distinctly different pairing states, with and without nodes, which have comparable .
- Received 13 May 2010
DOI:https://doi.org/10.1103/PhysRevB.81.220501
©2010 American Physical Society