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Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La[subscript 2 − x] Ce[subscript x] CuO[subscript 4 ± δ]

Author(s)
Higgins, J.; Greene, R. L.; Vishik, Inna; Mahmood, Fahad; Alpichshev, Zhanybek; Gedik, Nuh; ... Show more Show less
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Alternative title
Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La 2 − x Ce x CuO 4 ± δ
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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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.
Date issued
2017-03
URI
http://hdl.handle.net/1721.1/109835
Department
Massachusetts Institute of Technology. Department of Physics
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
ISSN
2469-9950
2469-9969

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