Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La[subscript 2 − x] Ce[subscript x] CuO[subscript 4 ± δ]
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PhysRevB.95.115125.pdf
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Author(s)
Higgins, J.
Greene, R. L.
Vishik, Inna
Mahmood, Fahad
Alpichshev, Zhanybek
Gedik, Nuh
Alternative Title
Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La 2 − x Ce x CuO 4 ± δ
Date Issued
March 2017
Journal
Physical Review B
Publisher
American Physical Society
Citation
Vishik, I. M. et al. “Ultrafast Dynamics in the Presence of Antiferromagnetic Correlations in Electron-Doped Cuprate La[subscript 2 - X] Ce[subscript X] CuO [subscript 4±δ]” Physical Review B 95.11 (2017): n. pag. © 2017 American Physical Society
Version
Final published version
Abstract
We used femtosecond optical pump-probe spectroscopy to study the photoinduced change in reflectivity of thin films of the electron-doped cuprate La[subscript 2−x]Ce[subscript x]CuO[subscript 4] (LCCO) with dopings of x=0.08 (underdoped) and x=0.11 (optimally doped). Above T[subscript c], we observe fluence-dependent relaxation rates that begin at a temperature similar to the one where transport measurements first show signatures of antiferromagnetic correlations. Upon suppressing superconductivity with a magnetic field, it is found that the fluence and temperature dependence of relaxation rates are consistent with bimolecular recombination of electrons and holes across a gap (2Δ[subscript AF]) originating from antiferromagnetic correlations which comprise the pseudogap in electron-doped cuprates. This can be used to learn about coupling between electrons and high-energy (ω>2Δ[subscript AF]) excitations in these compounds and set limits on the time scales on which antiferromagnetic correlations are static.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.95.115125
