Abstract
The three-dimensional band structure and superconducting gap of are studied with angle-resolved photoemission spectroscopy. In contrast with previous results, we have identified three holelike Fermi surface sheets near the zone center with sizable out-of-plane or dispersion. The superconducting gap on certain Fermi surface sheets shows significant dependence. Moreover, the superconducting gap sizes are different at the same Fermi momentum for two bands with different spatial symmetries (one odd, one even). Our results further reveal the three-dimensional and orbital-dependent structure of the superconducting gap in iron pnictides, which facilitates the understanding of momentum-integrated measurements and provides a distinct test for theories.
- Received 20 June 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.117003
© 2010 The American Physical Society