Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-22
Phys. Rev. B 83, 020501(R) (2011)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
10.1103/PhysRevB.83.020501
We have performed angle-resolved photoemission spectroscopy on the overdoped Ba$_{0.3}$K$_{0.7}$Fe$_2$As$_2$ superconductor ($T_c$ = 22 K). We demonstrate that the superconducting (SC) gap on each Fermi surface (FS) is nearly isotropic whereas the gap value varies from 4.4 to 7.9 meV on different FSs. By comparing with under- and optimally-doped Ba$_{1-x}$K$_x$Fe$_2$As$_2$, we find that the gap value on each FS nearly scales with $T_c$ over a wide doping range (0.25 $\textyen leq$ $x$ $\textyen leq$ 0.7). Although the FS volume and the SC gap magnitude are strongly doping dependent, the multiple nodeless gaps can be commonly fitted by a single gap function assuming pairing up to the second-nearest-neighbor, suggesting the universality of the short-range pairing states with the $s_{\yenpm}$-wave symmetry.
Chen Guo-Feng
Ding Haibing
Kawahara Takayuki
Nakayama Kazunori
Neupane Madhab
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