We present Raman scattering experiments in La2−xSrxCuO4 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.
@article{arxiv.1010.0180,
title = {Unravelling the glue and the competing order in superconducting cuprates},
author = {S. Caprara and C. Di Castro and B. Muschler and R. Hackl and M. Lambacher and A. Erb and S. Komiya and Y. Ando and M. Grilli},
journal= {arXiv preprint arXiv:1010.0180},
year = {2010}
}
Comments
10 pages, 7 figures, Table position corrected, abstract and references extended