Out-of-plane momentum and symmetry dependent superconducting gap in Ba0. 6K0. 4Fe2As2
arXiv preprint arXiv:1006.3936, 2010•arxiv.org
The three-dimensional band structure and superconducting gap of Ba0. 6K0. 4Fe2As2 are
studied with high-resolution angle-resolved photoemission spectroscopy. In contrast to
previous results, we have identified three hole-like Fermi surfaces near the zone center with
sizable out-of-plane or kz dispersion. The superconducting gap on certain Fermi surface
shows significant kz-dependence. Moreover, we found that the superconducting gap sizes
are different at the same Fermi momentum for two bands with different spatial symmetries …
studied with high-resolution angle-resolved photoemission spectroscopy. In contrast to
previous results, we have identified three hole-like Fermi surfaces near the zone center with
sizable out-of-plane or kz dispersion. The superconducting gap on certain Fermi surface
shows significant kz-dependence. Moreover, we found that the superconducting gap sizes
are different at the same Fermi momentum for two bands with different spatial symmetries …
The three-dimensional band structure and superconducting gap of Ba0.6K0.4Fe2As2 are studied with high-resolution angle-resolved photoemission spectroscopy. In contrast to previous results, we have identified three hole-like Fermi surfaces near the zone center with sizable out-of-plane or kz dispersion. The superconducting gap on certain Fermi surface shows significant kz-dependence. Moreover, we found that the superconducting gap sizes are different at the same Fermi momentum for two bands with different spatial symmetries (one odd, one even). Our results provide further information on the rich superconducting gap structure in iron pnictides, and a distinct test for theories.
arxiv.org