We report an angle-resolved photoemission investigation of optimally-doped Ca0.33Na0.67Fe2As2. The Fermi surface topology of this compound is similar to that of the well-studied Ba0.6K0.4Fe2As2 material, except for larger hole pockets resulting from a higher hole concentration per Fe atoms. We find that the quasi-nesting conditions are weakened in this compound as compared to Ba0.6K0.4Fe2As2. As with Ba0.6K0.4Fe2As2 though, we observe nearly isotropic superconducting gaps with Fermi surface-dependent magnitudes. A small variation in the gap size along the momentum direction perpendicular to the surface is found for one of the Fermi surfaces. Our superconducting gap results on all Fermi surface sheets fit simultaneously very well to a global gap function derived from a strong coupling approach, which contains only 2 global parameters.
@article{arxiv.1402.5875,
title = {Observation of strong-coupling pairing with weakened Fermi-surface nesting at optimal hole doping in Ca$_{0.33}$Na$_{0.67}$Fe$_2$As$_2$},
author = {Y. -B. Shi and Y. -B. Huang and X. -P. Wang and X. Shi and A. van Roekeghem and W. -L. Zhang and N. Xu and P. Richard and T. Qian and E. D. L. Rienks and S. Thirupathaiah and K. Zhao and C. -Q. Jin and M. Shi and H. Ding},
journal= {arXiv preprint arXiv:1402.5875},
year = {2014}
}