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

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.

preprint2014arXivOpen access
Y. OtaK. OkazakiY. KotaniT. ShimojimaW. MalaebS. WatanabeC. -T. ChenK. KihouC. H. LeeA. IyoH. EisakiT. SaitoH. FukazawaY. KohoriS. Shin
cond-mat.supr-con
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Open access15 authors1 topic
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Y. OtaK. OkazakiY. KotaniT. ShimojimaW. MalaebS. WatanabeC. -T. ChenK. KihouC. H. LeeA. IyoH. EisakiT. SaitoH. FukazawaY. KohoriS. Shin

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