Band-dependent quasiparticle dynamics in the hole-doped Ba-122 iron pnictides
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Author(s)
Chen, G.F.
Luo, J.L.
Wang, N.L.
Gedik, Nuh
Torchinsky, Darius H.
McIver, James
Hsieh, David
Date Issued
May 2011
Journal
Journal of Physics and Chemistry of Solids
Publisher
Elsevier
Citation
Torchinsky, Darius H., James W. McIver, David Hsieh, G.F. Chen, J.L. Luo, N.L. Wang, and Nuh Gedik. “Band-Dependent Quasiparticle Dynamics in the Hole-Doped Ba-122 Iron Pnictides.” Journal of Physics and Chemistry of Solids 72, no. 5 (May 2011): 519–522.
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Original manuscript
Abstract
We report on band-dependent quasiparticle dynamics in the hole-doped Ba-122 pnictides measured by ultrafast pump-probe spectroscopy. In the superconducting state of the optimal and over hole-doped samples, we observe two distinct relaxation processes: a fast component whose decay rate increases linearly with excitation density and a slow component whose relaxation is independent of excitation strength. We argue that these two components reflect the recombination of quasiparticles in the two hole bands through intraband and interband processes. We also find that the thermal recombination rate of quasiparticles increases quadratically with temperature in all samples. The temperature and excitation density dependence of the decays indicates fully gapped hole bands and nodal or very anisotropic electron bands.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1016/j.jpcs.2010.10.066
