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

Miao, Hu; Brito, W. H.; Yin, Z. P.; Zhong, R. D.; Gu, G. D.; Johnson, P. D.; Dean, M. P.  M.; Choi, S.; Kotliar, G.; Ku, W.; Wang, X. C.; Jin, C. Q.; Wu, S. -F.; Qian, T.; Ding, H.

doi:10.1103/PhysRevB.98.020502

Title: Universal $2 Δ_{max} / k_{B} T_{c}$ scaling decoupled from the electronic coherence in iron-based superconductors

Journal Article · Sun Jul 01 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.020502· OSTI ID:1466587

^[1]; Brito, W. H. ^[2]; Yin, Z. P. ^[3]; Zhong, R. D. ^[2]; Gu, G. D. ^[2]; Johnson, P. D. ^[2]; Dean, M. P. M. ^[2]; Choi, S. ^[2]; Kotliar, G. ^[4]; Ku, W. ^[5]; Wang, X. C. ^[6]; Jin, C. Q. ^[7]; Wu, S. -F. ^[6]; Qian, T. ^[6]; Ding, H. ^[7]

Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Beijing Normal Univ., Beijing (China). Dept. of Physics and Center for Advanced Quantum Studies
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
Shanghai Jiao Tong Univ. (China). Tsung-Dao Lee Inst., School of Physics and Astronomy
Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)

Here in this paper, 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 ( FeTe_0.55Se_0.45). 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 T_c ratio 2Δ_max/k_BT_c, 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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1466587

Alternate ID(s):: OSTI ID: 1459472

Report Number(s):: BNL-207992-2018-JAAM; PRBMDO

Journal Information:: Physical Review B, Vol. 98, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Title: Universal $2 Δ_{max} / k_{B} T_{c}$ scaling decoupled from the electronic coherence in iron-based superconductors