1205.0787 (M. Xu et al.)

Angle-resolved photoemission evidence of s-wave superconducting gap in
KxFe2-ySe2 superconductor    [PDF]

M. Xu, Q. Q. Ge, R. Peng, Z. R. Ye, Juan Jiang, F. Chen, X. P. Shen, B. P. Xie, Y. Zhang, D. L. Feng

Although nodeless superconducting gap has been observed on the large Fermi pockets around the zone corner in KxFe2-ySe2, whether its pairing symmetry is s-wave or nodeless d-wave is still under intense debate. Here we report an isotropic superconducting gap distribution on the small electron Fermi pocket around the Z point in KxFe2-ySe2, which favors the s-wave pairing symmetry.

View original: http://arxiv.org/abs/1205.0787