Raman-scattering measurements and theory of the energy-momentum spectrum for Underdoped Bi2Sr2CaCuO8+δ Superconductors: Evidence of an s-wave structure for the pseudogap

S. Sakai, S. Blanc, M. Civelli, Y. Gallais, M. Cazayous, M. A. Méasson, J. S. Wen, Z. J. Xu, G. D. Gu, G. Sangiovanni, Y. Motome, K. Held, A. Sacuto, A. Georges, M. Imada

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Abstract

We reveal the full energy-momentum structure of the pseudogap of underdoped high-Tc cuprate superconductors. Our combined theoretical and experimental analysis explains the spectral-weight suppression observed in the B2g Raman response at finite energies in terms of a pseudogap appearing in the single-electron excitation spectra above the Fermi level in the nodal direction of momentum space. This result suggests an s-wave pseudogap (which never closes in the energy-momentum space), distinct from the d-wave superconducting gap. Recent tunneling and photoemission experiments on underdoped cuprates also find a natural explanation within the s-wave pseudogap scenario.

Original languageEnglish
Article number107001
JournalPhysical Review Letters
Volume111
Issue number10
DOIs
Publication statusPublished - 2013 Sep 3

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Sakai, S., Blanc, S., Civelli, M., Gallais, Y., Cazayous, M., Méasson, M. A., Wen, J. S., Xu, Z. J., Gu, G. D., Sangiovanni, G., Motome, Y., Held, K., Sacuto, A., Georges, A., & Imada, M. (2013). Raman-scattering measurements and theory of the energy-momentum spectrum for Underdoped Bi2Sr2CaCuO8+δ Superconductors: Evidence of an s-wave structure for the pseudogap. Physical Review Letters, 111(10), [107001]. https://doi.org/10.1103/PhysRevLett.111.107001