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Unconventional High-Energy-State Contribution to the Cooper Pairing in the Underdoped Copper-Oxide Superconductor HgBa 2 Ca 2 Cu 3 O 8 + δ

Abstract : We study the temperature-dependent electronic B1g Raman response of a slightly under-doped single crystal HgBa2Ca2Cu3O8+δ with a superconducting critical temperature Tc =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 Tc . This result hints at an unconventional pairing mechanism, whereas 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 and the pseudo gaps.
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B. Loret, S. Sakai, Y. Gallais, M. Cazayous, A. Méasson, et al.. Unconventional High-Energy-State Contribution to the Cooper Pairing in the Underdoped Copper-Oxide Superconductor HgBa 2 Ca 2 Cu 3 O 8 + δ. Physical Review Letters, American Physical Society, 2016, 116 (19), ⟨10.1103/PhysRevLett.116.197001⟩. ⟨cea-01484035⟩

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