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 language | English |
|---|---|
| Article number | 054503 |
| Journal | Physical Review B |
| Volume | 103 |
| Issue number | 5 |
| DOIs | |
| State | Published - Feb 10 2021 |
Funding
This research at Oak Ridge National Laboratory (ORNL) was sponsored by the Laboratory Directed Research and Development Program of ORNL, managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 for the US Department of Energy (ARPES) and by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (transport). Y.W. was supported by the US Department of Energy, Office of Science, Basic Energy Sciences as a part of the Computational Materials Science Program through the Center for Computational Design of Functional Strongly Correlated Materials and Theoretical Spectroscopy. G.K. was supported by NSF Grant No. DMR-1733071. Work at the IOP is supported by grants from the National Natural Science Foundation of China (Grants No. 11888101 and No. 11674371), and the Ministry of Science and Technology of China (Grant No. 2016YFA0401000). Work at Princeton University was supported by the Gordon and Betty Moore Foundation (GBMF4547/Hasan) and the US Department of Energy (US DOE) under the Basic Energy Sciences program (Grant No. DOE/BES DE- FG-02-05ER46200). This work is partly based on support by the US DOE, Office of Science through the Quantum Science Center (QSC), a National Quantum Information Science Research Center.
| Funders | Funder number |
|---|---|
| ARPES | |
| Basic Energy Sciences Program | DOE/BES DE- FG-02-05ER46200 |
| Laboratory Directed Research and Development Program of ORNL | |
| National Quantum Information Science Research Center | |
| Quantum Science Center | |
| National Science Foundation | DMR-1733071 |
| National Science Foundation | |
| U.S. Department of Energy | |
| Directorate for Mathematical and Physical Sciences | 1733071 |
| Directorate for Mathematical and Physical Sciences | |
| Gordon and Betty Moore Foundation | |
| Office of Science | |
| Basic Energy Sciences | |
| Oak Ridge National Laboratory | |
| UT-Battelle | DE-AC05-00OR22725 |
| UT-Battelle | |
| National Natural Science Foundation of China | 11888101, 11674371 |
| National Natural Science Foundation of China | |
| Ministry of Science and Technology of the People's Republic of China | 2016YFA0401000 |
| Ministry of Science and Technology of the People's Republic of China |