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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

By B. Loret, S. Sakai, Y. Gallais, M. Cazayous, A. Méasson, A. Forget, D. Colson, M. Civelli and A. Sacuto

Abstract

International audienceWe study the temperature-dependent electronic B1g Raman response of a slightly under-dopedsingle crystal HgBa2Ca2Cu3O8+δ with a superconducting critical temperature Tc =122 K. Our mainfinding is that the superconducting pair-breaking peak is associated with a dip on its higher-energyside, disappearing together at Tc . This result hints at an unconventional pairing mechanism, whereasspectral weight lost in the dip is transferred to the pair-breaking peak at lower energies. Thisconclusion is supported by cellular dynamical mean-field theory on the Hubbard model, which isable to reproduce all the main features of the B1g Raman response and explain the peak-dip behaviorin terms of a nontrivial relationship between the superconducting and the pseudo gaps

Topics: [ PHYS ] Physics [physics]
Publisher: American Physical Society
Year: 2016
DOI identifier: 10.1103/PhysRevLett.116.197001
OAI identifier: oai:HAL:cea-01484035v1
Provided by: Hal-Diderot
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