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

MPS-Authors
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Le Tacon,  M.
Solid State Spectroscopy, Max Planck Institute for Solid State Research, Max Planck Society;

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Boris,  A. V.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Loew,  T.
Solid State Spectroscopy, Max Planck Institute for Solid State Research, Max Planck Society;

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Lin,  C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Chen,  L.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer,  B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Li, Y., Le Tacon, M., Matiks, Y., Boris, A. V., Loew, T., Lin, C. T., et al. (2013). Doping-Dependent Photon Scattering Resonance in the Model High-Temperature Superconductor HgBa2CuO4+δ Revealed by Raman Scattering and Optical Ellipsometry. Physical Review Letters, 111(18): 187001.


Cite as: https://hdl.handle.net/21.11116/0000-000E-C6F1-2
Abstract
We study the model high-temperature superconductor HgBa2CuO4+delta 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.