Unravelling the glue and the competing order in superconducting cuprates

2010/10/01 by S. Caprara, Caprara, S., C. Di Castro +15
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.1010.0180

10 pages, 7 figures, Table position corrected, abstract and references extended

arxiv created 2010/10/06 · arxiv updated 2010/10/07

Abstract

We present Raman scattering experiments in \rm La_2-xSr_xCuO₄ single crystals at various doping levels x and compare the results with theoretical predictions obtained assuming an interaction mediated by spin and charge fluctuations. The light-scattering selection rules allow us to disentangle their respective contributions. We find that the glue spectral function is spin-dominated at low doping while the contribution of charge fluctuations becomes dominant around optimal doping. This indicates that the fluctuations of a nearly ordered state with coexisting spin and charge order support the superconducting pairing.

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