Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La2-xCexCuO4±δ

I. M. Vishik, F. Mahmood, Z. Alpichshev, N. Gedik, J. Higgins, R. L. Greene

Research output: Contribution to journalArticlepeer-review

Abstract

We used femtosecond optical pump-probe spectroscopy to study the photoinduced change in reflectivity of thin films of the electron-doped cuprate La2-xCexCuO4 (LCCO) with dopings of x=0.08 (underdoped) and x=0.11 (optimally doped). Above Tc, 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 (2ΔAF) 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>2ΔAF) excitations in these compounds and set limits on the time scales on which antiferromagnetic correlations are static.

Original languageEnglish (US)
Article number115125
JournalPhysical Review B
Volume95
Issue number11
DOIs
StatePublished - Mar 13 2017
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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