Unconventional high-energy-state contribution to the Cooper pairing in under-doped copper-oxide superconductor HgBa$_2$Ca$_2$Cu$_3$O$_{8+\delta}$
| Autor: | Loret, B., Sakai, S., Gallais, Y., Cazayous, M., Méasson, M. -A., Forget, A., Colson, D., Civelli, M., Sacuto, A. |
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| Rok vydání: | 2016 |
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| Zdroj: | Phys. Rev. Lett. 116, 197001 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.197001 |
| Popis: | 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. Comment: 7 pages 4 figures |
| Databáze: | arXiv |
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