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, C. Q. Jin, T. Qian, H. Ding, H. N. Lee, G. Kotliar

Research output: Contribution to journalArticlepeer-review

Abstract

We combine transport, angle-resolved photoemission spectroscopy, and scanning tunneling spectroscopy to investigate several low-energy manifestations of the Hund's coupling in a canonical FeSC family Li(Fe,Co)As. We determine the doping dependence of the coherent-incoherent crossover temperature and the quasiparticle 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 (2Δmax/kBTc) value, which is independent of doping level and Tc.

Original languageEnglish (US)
Article number054503
JournalPhysical Review B
Volume103
Issue number5
DOIs
StatePublished - Feb 10 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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