Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La[subscript 2 − x] Ce[subscript x] CuO[subscript 4 ± δ]
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...
| Principais autores: | , , , , , |
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| Outros Autores: | |
| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
American Physical Society
2017
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| Acesso em linha: | http://hdl.handle.net/1721.1/109835 https://orcid.org/0000-0002-7903-0960 https://orcid.org/0000-0002-9641-3453 https://orcid.org/0000-0002-7183-5203 https://orcid.org/0000-0002-6394-4987 |
| Resumo: | 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. |
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