C-axis electronic Raman scattering in Bi2Sr2CaCu2O8+δ
Abstract
We report a c-axis-polarized electronic Raman scattering study of Bi2Sr2CaCu2O8+δ single crystals. In the normal state, a resonant electronic continuum extends to 1.5 eV and gains significant intensity as the incoming photon energy increases. In the superconducting state, a coherence 2 peak appears around 50 meV, with a suppression of the scattering intensity at frequencies below the peak position. The peak energy, which is higher than that seen with in-plane polarizations, signifies distinctly different dynamics of quasiparticle excitations created with out-of-plane polarization.
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