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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