Unconventional high-energy-state contribution to the Cooper pairing in under-doped copper-oxide superconductor HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$

Abstract

We study the temperature-dependent electronic B1g Raman response of a slightly under-doped single crystal HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ 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.

arXiv comment7 pages 4 figures

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• Multilayer Effects in Bi2Sr2Ca2Cu3O10+z Superconductors
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• Spin singlet and quasiparticles excitations in cuprate superconductors