Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering

Abstract

We explored by electronic Raman scattering the superconducting state of Bi-2212 single crystal by performing a fine tuned doping study. We found three distinct energy scales in A1g, B1g and B2g symmetries which show three distinct doping dependencies. Above p=0.22 the three energies merge, below p=0.12, the A1g scale is no more detectable while the B1g and B2g scales become constant in energy. In between, the A1g and B1g scales increase monotonically with under-doping while the B2g one exhibits a maximum at p=0.16. The three superconducting energy scales appear to be an universal feature of hole-doped cuprates. We propose that the non trivial doping dependence of the three scales originates from Fermi surface topology changes and reveals competing orders inside the superconducting dome.

6 pages, 5 figures

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Cited by in corpus (9)

• Superconducting fluctuations probed by the Higgs mode in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$ thin films
• Charge orders, magnetism and pairings in the cuprate superconductors
• Effective SU(2) theory for the pseudogap state
• $\eta$ collective mode as A${}_{1g}$ Raman resonance in cuprate superconductors
• Universal relationship between the energy scales of the pseudogap phase, the superconducting state and the charge density wave order in copper oxide superconductors
• Exploration of the Hg-based cuprate superconductors by Raman spectroscopy under hydrostatic pressure
• A model for the neutron resonance in HgBa${}_2$CuO${}_{4+\delta }$
• Long-wavelength phonon dynamics in incommensurate Bi2Sr2CaCu2O(8+delta) crystals by Brillouin light scattering spectroscopy
• Spin singlet and quasiparticles excitations in cuprate superconductors