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Doping-Dependent Photon Scattering Resonance in the Model High-Temperature Superconductor HgBa2CuO4+δ Revealed by Raman Scattering and Optical Ellipsometry

We study the model high-temperature superconductor HgBa2CuO4+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.

PACS: 74.25.nd; 74.40.-n; 74.72.Gh; 74.72.Kf

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