Evidence for exclusion of the possibility of $d$-wave superconducting-gap symmetry in Ba-doped KFe$_2$As$_2$

A. Iyo; C. H. Lee; C. -T. Chen; H. Eisaki; H. Fukazawa; K. Kihou; K. Okazaki; S. Shin; S. Watanabe; T. Saito

arxiv: 1307.7922 · v3 · pith:OCPSONOFnew · submitted 2013-07-30 · ❄️ cond-mat.supr-con

Evidence for exclusion of the possibility of d-wave superconducting-gap symmetry in Ba-doped KFe₂As₂

Y. Ota , K. Okazaki , Y. Kotani , T. Shimojima , W. Malaeb , S. Watanabe , C. -T. Chen , K. Kihou

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C. H. Lee A. Iyo H. Eisaki T. Saito H. Fukazawa Y. Kohori S. Shin

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classification ❄️ cond-mat.supr-con

keywords ba-dopedanisotropypossibilitysymmetrywaveamountangle-resolvedchange

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We have investigated the superconducting(SC)-gap anisotropy for several Ba-doped KFe$_2$As$_2$ samples using laser-based angle-resolved photoemission spectroscopy. We show that the SC-gap anisotropy and node positions drastically change with a small amount of Ba doping. Our results totally exclude a possibility of $d$-wave symmetry and strongly suggest that both spin and orbital fluctuations are important for the paring interaction in the Ba-doped K122.

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Evidence for exclusion of the possibility of d-wave superconducting-gap symmetry in Ba-doped KFe₂As₂

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