February 2021

Journal

Hund’s superconductor Li(Fe,Co)As

By:
Miao, Hu ; Wang, Yilin; Yin, JiaXin; Zhang, Jie ; Zhang, Songtian; Hasan, M. Zahid; Yang, Run; Wang, Xiancheng; Jin, Changqing; Qian, T; Ding, Hong; Lee, Honyung ; Kotliar, G
Journal Name:
Physical Review B
Page Number:
054503
Volume:
103
Issue Number:
5
Publication Date:
February 2021
View DOI Listing:
https://doi.org/10.1103/PhysRevB.103.054503

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.


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