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arxiv: 2011.11475 · v1 · pith:Y63ANEEU · submitted 2020-11-23 · cond-mat.supr-con · cond-mat.str-el

The Hund's Superconductor Li(Fe,Co)As

H. Miao , Y. L. Wang , J.-X. Yin , J. Zhang , S. Zhang , M. Z. Hasan , R. Yang , X. C. Wang
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C. Q. Jin T. Qian H. Ding H.-L. Lee G. Kotliar
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classification cond-mat.supr-con cond-mat.str-el
keywords hundspectroscopystatedopingsuperconductingtemperaturetunnelingangle-resolved
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We combine transport, angle-resolved photoemission spectroscopy and scanning tunneling spectroscopy to investigate several low energy manifestations of the Hund coupling in a canonical FeSC family Li(Fe,Co)As. We determine the doping dependence of the coherent-incoherent crossover temperature and the quasi-particle effective mass enhancement in the normal state. Our tunneling spectroscopy result in the superconducting state supports the idea that superconductivity emerging from Hund's metal state displays a universal maximal superconducting gap vs transition temperature (2$\Delta_{max}/k_{B}T_{c}$) value, which is independent of doping level and $T_{c}$.

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