2005/01/01 by S. Caprara, C. Di Castro, M. Grilli +3
Business, Management and Accounting · Environmental Science · Materials Science · Physics and Astronomy · Social Sciences · #Advanced Condensed Matter Physics #Finance, Taxation, and Governance #Magnetic and transport properties of perovskites and related materials #Organizational Management and Innovation #Physics of Superconductivity and Magnetism #Regional Development and Innovation #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.95.117004
5 pages, 3 figures
openalex publication_date 2005/01/01 · arxiv created 2005/01/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/04/28
We calculate the Raman response contribution due to soft collective modes, finding a strong dependence on the photon polarizations and on the characteristic wave vectors of the modes. We compare our results with recent Raman spectroscopy experiments in underdoped cuprates, La2-xSrxCuO4 and (Y1.97Ca0.3)Ba2CuO6.05, 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 can naturally arise from charge collective excitations at finite wavelength.