Charge-fluctuation contribution to the Raman response in superconducting cuprates

Details Charge-fluctuation contribution to the Raman response in superconducting cuprates Charge-fluctuation contribution to the Raman response in superconducting cuprates

2005-01-27

arxiv.org/abs/cond-mat/0501671v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.117004

We calculate the Raman response contribution due to collective modes, finding a strong dependence on the photon polarizations and on the characteristic wavevectors of the modes. We compare our results with recent Raman spectroscopy experiments in underdoped cuprates, $La_{2-x}Sr_xCuO_4$ and $(Y_{1.97}Ca_{0.3})Ba_2CuO_{6.05}$, where anomalous low-energy peaks are observed, which soften upon lowering the temperature. We show that the specific dependence on doping and on photon polarizations of these peaks is only compatible with charge collective excitations at finite wavelength.

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