2008/05/28 by S. Caprara, C. Di Castro, Tilman Enss +2
Engineering · Physics and Astronomy · #Charge (physics) #Charge carrier #Condensed matter physics #Critical point (mathematics) #Cuprate #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Raman spectroscopy #Spectral line #Spin (aerodynamics) #Superconducting Materials and Applications #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1016/j.jmmm.2008.11.025
5 pages, 3 figures
arxiv created 2008/05/28 · openalex publication_date 2008/11/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We discuss how Raman spectra are affected by nearly-critical spin and charge collective modes, which are coupled to charge carriers near a stripe quantum critical point. We show that specific fingerprints of nearly-critical collective modes can indeed be observed in Raman spectra and that the selectivity of Raman spectroscopy in momentum space may also be exploited to distinguish the spin and charge contribution. We apply our results to discuss the spectra of high-Tc superconducting cuprates finding that the collective modes should have masses with substantial temperature dependence in agreement with their nearly critical character. Moreover spin modes should be more diffusive than charge modes indicating that in stripes the charge is nearly ordered, while spin modes are strongly overdamped and fluctuate with high frequency.