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Title: Universal 2 Δ max / k B T c scaling decoupled from the electronic coherence in iron-based superconductors

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.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [4] ;  [5] ;  [6] ;  [7] ;  [6] ;  [6] ;  [7]
  1. 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.
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  3. Beijing Normal Univ., Beijing (China). Dept. of Physics and Center for Advanced Quantum Studies
  4. 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
  5. Shanghai Jiao Tong Univ. (China). Tsung-Dao Lee Inst., School of Physics and Astronomy
  6. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
  7. 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)
Publication Date:
Report Number(s):
BNL-207992-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1466587
Alternate Identifier(s):
OSTI ID: 1459472

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., and Ding, H.. Universal 2Δmax/kBTc scaling decoupled from the electronic coherence in iron-based superconductors. United States: N. p., Web. doi:10.1103/PhysRevB.98.020502.
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.. Universal 2Δmax/kBTc scaling decoupled from the electronic coherence in iron-based superconductors. United States. doi:10.1103/PhysRevB.98.020502.
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., and Ding, H.. 2018. "Universal 2Δmax/kBTc scaling decoupled from the electronic coherence in iron-based superconductors". United States. doi:10.1103/PhysRevB.98.020502.
@article{osti_1466587,
title = {Universal 2Δmax/kBTc scaling decoupled from the electronic coherence in iron-based superconductors},
author = {Miao, Hu and Brito, W. H. and Yin, Z. P. and Zhong, R. D. and Gu, G. D. and Johnson, P. D. and Dean, M. P. M. and Choi, S. and Kotliar, G. and Ku, W. and Wang, X. C. and Jin, C. Q. and Wu, S. -F. and Qian, T. and Ding, H.},
abstractNote = {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 ( 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.},
doi = {10.1103/PhysRevB.98.020502},
journal = {Physical Review B},
number = 2,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}