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

doi:10.1103/PhysRevB.103.054503

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

DOI 10.1103/PhysRevB.103.054503 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	Pressure not reported	unknown
LiFe0.99Co0.01As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown