Spectral signatures of critical charge and spin fluctuations in cuprates

Details Spectral signatures of critical charge and spin fluctuations in cuprates Spectral signatures of critical charge and spin fluctuations in cuprates

2009-03-14

arxiv.org/abs/0903.2588v1

Physics

Condensed Matter

Superconductivity

6 pages and 3 figures, invited paper to the conference SCES 08, Buzios/Rio, Brazil

Scientific paper

We discuss how Raman spectra of high temperature superconducting cuprates are affected by nearly-critical spin and charge collective modes, which are coupled to charge carriers near a stripe quantum critical point. We find that specific fingerprints of nearly-critical collective modes can be observed and that the selectivity of Raman spectroscopy in momentum space may be exploited to distinguish the spin and charge contribution. We apply our results to discuss the spectra of high-T_c superconducting cuprates finding that the collective modes should have masses with substantial temperature dependence in agreement with their nearly critical character. Moreover spin modes have larger masses and are more diffusive than charge modes indicating that in stripes the charge is nearly ordered, while spin modes are strongly overdamped and fluctuating with high frequency.

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