Unconventional High-Energy-State Contribution to the Cooper Pairing in the Underdoped Copper-Oxide Superconductor HgBa2Ca2Cu3O8+δ

B. Loret, S. Sakai, Y. Gallais, M. Cazayous, M.-A. Méasson, A. Forget, D. Colson, M. Civelli, and A. Sacuto
Phys. Rev. Lett. 116, 197001 – Published 11 May 2016
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Abstract

We study the temperature-dependent electronic B1g Raman response of a slightly underdoped single crystal HgBa2Ca2Cu3O8+δ with a superconducting critical temperature Tc=122K. Our main finding is that the superconducting pair-breaking peak is associated with a dip on its higher-energy side, disappearing together at Tc. This result reveals a key aspect of the unconventional pairing mechanism: spectral weight lost in the dip is transferred to the pair-breaking peak at lower energies. This conclusion is supported by cellular dynamical mean-field theory on the Hubbard model, which is able to reproduce all the main features of the B1g Raman response and explain the peak-dip behavior in terms of a nontrivial relationship between the superconducting gap and the pseudogap.

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  • Received 26 January 2016

DOI:https://doi.org/10.1103/PhysRevLett.116.197001

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

B. Loret1, S. Sakai2,*, Y. Gallais1, M. Cazayous1, M.-A. Méasson1, A. Forget4, D. Colson4, M. Civelli3,†, and A. Sacuto1,‡

  • 1Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, Bâtiment Condorcet, 75205 Paris Cedex 13, France
  • 2Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 3Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
  • 4Service de Physique de l’État Condensé, DSM/IRAMIS/SPEC (UMR 3680 CNRS), CEA Saclay 91191 Gif sur Yvette cedex France

  • *shiro.sakai@riken.jp
  • civelli@u-psud.fr
  • alain.sacuto@univ-paris-diderot.fr

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Issue

Vol. 116, Iss. 19 — 13 May 2016

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