Possible nodal superconducting gap emerging at the Lifshitz transition in heavily hole-doped Ba0.1K0.9Fe2As2

A. van Roekeghem; E. Ieki; E. Razzoli; E. Rienks; G.-F. Chen; H. Ding; K. Nakayama; M. Shi; N. Xu; P. Richard

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Possible nodal superconducting gap emerging at the Lifshitz transition in heavily hole-doped Ba0.1K0.9Fe2As2

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arxiv 1308.3888 v1 pith:LDEAN2KJ submitted 2013-08-18 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

N. Xu , P. Richard , X. Shi , A. van Roekeghem , T. Qian , E. Razzoli , E. Rienks , G.-F. Chen

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E. Ieki K. Nakayama T. Sato T. Takahashi M. Shi H. Ding

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classification cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el

keywords fe2as2fermisurfaceemerginglifshitzsimilarsuperconductingtopology

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We performed a high energy resolution ARPES investigation of over-doped Ba0.1K0.9Fe2As2 with T_c= 9 K. The Fermi surface topology of this material is similar to that of KFe2As2 and differs from that of slightly less doped Ba0.3K0.7Fe2As2, implying that a Lifshitz transition occurred between x=0.7 and x=0.9. Albeit for a vertical node found at the tip of the emerging off-M-centered Fermi surface pocket lobes, the superconducting gap structure is similar to that of Ba0.3K0.7Fe2As2, suggesting that the paring interaction is not driven by the Fermi surface topology.

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