Pair breaking versus symmetry breaking: Origin of the Raman modes in superconducting cuprates

2009/01/22 by N. Munnikes, Munnikes, N., B. Muschler +23
Physics and Astronomy · #Physics of Superconductivity and Magnetism #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.0901.3448

arxiv created 2009/01/22 · arxiv updated 2009/12/01

Abstract

We performed Raman experiments on superconducting \rm Bi₂ Sr₂ (Ca_1-x Y_x) Cu₂ O_8+δ (Bi-2212) and \rm YBa₂ Cu₃O_6+x (Y-123) single crystals. These results in combination with earlier ones enable us to analyze systematically the spectral features in the doping range 0.07 ≤ p ≤ 0.23. In B_2g (xy) symmetry we find universal spectra and the maximal gap energy Δ₀ to follow the superconducting transition temperature T_c. The B_1g (x²-y²) spectra in Bi-2212 show an anomalous increase of the intensity towards overdoping, indicating that the corresponding energy scale is neither related to the pairing energy nor to the pseudogap, but possibly stems from a symmetry breaking transition at the onset point of superconductivity at p_{\rm sc2} ≃ 0.27.

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