Universal 2Δmax/kBTc scaling decoupled from the electronic coherence in iron-based superconductors

Here, we use angle-resolved photoemission spectroscopy to study superconductivity that emerges in two extreme cases, from a Fermi-liquid phase (LiFeAs) and an incoherent bad-metal phase (FeTe0.55Se0.45). We find that although the electronic coherence can strongly reshape the single-particle spectral...

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Bibliographic Details
Published in:Physical review. B 2018-07, Vol.98 (2), p.020502
Main Authors: Miao, H, Brito, W H, Yin, Z P, Zhong, R D, Gu, G D, Johnson, P D, Dean, M P, Choi, S, Kotliar, G, Ku, W, Wang, X C, Jin, C Q, Wu, S-F, Qian, T, Ding, H
Format: Article
Language:English
Subjects:
Coherence
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Iron
Liquid phases
Photoelectric emission
Scaling
Superconductivity
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Summary:Here, we use angle-resolved photoemission spectroscopy to study superconductivity that emerges in two extreme cases, from a Fermi-liquid phase (LiFeAs) and an incoherent bad-metal phase (FeTe0.55Se0.45). We find that although the electronic coherence can strongly reshape the single-particle spectral function in the superconducting state, it is decoupled from the maximum-superconducting-gap and Tc ratio 2Δmax/kBTc, which shows a universal scaling that is valid for all iron-based superconductors (FeSCs). Our observation excludes pairing scenarios in the BCS and the BEC limit for FeSCs and calls for a universal strong-coupling pairing mechanism for the FeSCs.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.020502