Doping-dependent photon scattering resonance in the model high-temperature superconductor HgBa2CuO4+δ revealed by Raman scattering and optical ellipsometry

Yuan Li, M. Le Tacon, Y. Matiks, A. V. Boris, T. Loew, C. T. Lin, Lu Chen, M. K. Chan, C. Dorow, L. Ji, N. Barišić, X. Zhao, M. Greven, B. Keimer

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Abstract

We study the model high-temperature superconductor HgBa2CuO 4+δ with electronic Raman scattering and optical ellipsometry over a wide doping range. The dependence of the resonant Raman cross section on the incident photon energy changes drastically as a function of doping, in a manner that corresponds to a rearrangement of the interband optical transitions seen with ellipsometry. This doping-dependent Raman resonance allows us to reconcile the apparent discrepancy between Raman and x-ray detection of magnetic fluctuations in superconducting cuprates. Intriguingly, the strongest variation occurs across the doping level where the antinodal superconducting gap appears to reach its maximum.

Original languageEnglish (US)
Article number187001
JournalPhysical review letters
Volume111
Issue number18
DOIs
StatePublished - Oct 30 2013

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