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Title: Nonequilibrium Pair Breaking in Ba ( Fe 1 - x Co x ) 2 As 2 Superconductors: Evidence for Formation of a Photoinduced Excitonic State

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [1];  [1];  [1];  [2];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Univ. of Alabama, Birmingham, AL (United States). Dept. of Physics

Ultrafast terahertz (THz) pump-probe spectroscopy reveals an unusual out-of-equilibrium Cooper pair nonlinear dynamics and a nonequilibrium state driven by femtosecond (fs) photoexcitation of superconductivity (SC) in iron pnictides. Following fast SC quench via hot-phonon scattering, a second, abnormally slow (many hundreds of picoseconds), SC quench regime is observed prior to any recovery. Importantly, a nonlinear pump fluence dependence is identified for this remarkably long prebottleneck dynamics that are sensitive to both doping and temperature. Here, using quantum kinetic modeling we argue that the buildup of excitonic interpocket correlation between electron-hole (e-h) quasiparticles (QP) quenches SC after fs photoexcitation leading to a long-lived, many-QP excitonic state.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Univ. of Alabama, Birmingham, AL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
W911NF-15-1-0135; SC0019137; AC02-07CH11358
OSTI ID:
1492059
Alternate ID(s):
OSTI ID: 1488904; OSTI ID: 1971747
Report Number(s):
IS-J-9790
Journal Information:
Physical Review Letters, Vol. 121, Issue 26; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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