Unconventional High-Energy-State Contribution to the Cooper Pairing in the Underdoped Copper-Oxide Superconductor HgBa_{2}Ca_{2}Cu_{3}O_{8+δ}.

@article{Loret2016UnconventionalHC,
  title={Unconventional High-Energy-State Contribution to the Cooper Pairing in the Underdoped Copper-Oxide Superconductor HgBa\_\{2\}Ca\_\{2\}Cu\_\{3\}O\_\{8+$\delta$\}.},
  author={Bastien Loret and Shiro Sakai and Yann Gallais and Maximilien Cazayous and M.-A. Measson and Anne Forget and Doroth{\'e}e Colson and Marcello Civelli and Alain Sacuto},
  journal={Physical review letters},
  year={2016},
  volume={116 19},
  pages={
          197001
        }
}
We study the temperature-dependent electronic B_{1g} Raman response of a slightly underdoped single crystal HgBa_{2}Ca_{2}Cu_{3}O_{8+δ} with a superconducting critical temperature T_{c}=122  K. Our main finding is that the superconducting pair-breaking peak is associated with a dip on its higher-energy side, disappearing together at T_{c}. 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… 
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