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Observation of a van Hove singularity and implication for strong coupling induced Cooper pairing in KFe2As2

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arxiv 1412.0945 v2 pith:FMFQKOQA submitted 2014-12-02 cond-mat.supr-con

Observation of a van Hove singularity and implication for strong coupling induced Cooper pairing in KFe2As2

Delong Fang , Xun Shi , Zengyi Du , Pierre Richard , Huan Yang , X.X.Wu , Peng Zhang , Tian Qian
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Xiaxin Ding Zhenyu Wang T. K. Kim M. Hoesch Aifeng Wang Xianhui Chen Jiangping Hu Hong Ding Hai-Hu Wen
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keywords kfe2as2beencoopercouplinghoveinducedobservationobserved
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Scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES) have been investigated on single crystal samples of KFe2As2. A van Hove singularity (vHs) has been directly observed just a few meV below the Fermi level E_F of superconducting KFe2As2, which locates in the middle of the principle axes of the first Brillouin zone. The majority of the density-of-states at E_F, mainly contributed by the proximity effect of the saddle point to E_F, is non-gapped in the superconducting state. Our observation of nodal behavior of the momentum area close to the vHs points, while providing consistent explanations to many exotic behaviours previously observed in this material, suggests Cooper pairing induced by a strong coupling mechanism.

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