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Alkaline-earth iron arsenide (122) is one of the most studied families ofiron-based superconductors, especially for angle-resolved photoemissionspectroscopy. While extensive photoemission results have been obtained, thesurface complexity of 122 caused by its charge-non-neutral surface is rarelyconsidered. Here, we show that the surface of 122 can be neutralized bypotassium deposition. In potassium-coated BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$,the surface-induced spectral broadening is strongly suppressed, and hence thecoherent spectra that reflect the intrinsic bulk electronic state recover. Thisenables the measuring of superconducting gap with unpreceded precision. Theresult shows the existence of two pairing channels. While the gap anisotropy onthe outer hole/electron pockets can be well fitted using an s$_\pm$ gapfunction, the gap anisotropy on the inner hole/electron shows a cleardeviation. Our results provide quantitative constraints for refiningtheoretical models and also demonstrate an experimental method for revealingthe intrinsic electronic properties of 122 in future studies.

Revealing the intrinsic superconducting gap anisotropy in surface-neutralized BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$