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.
Charge-fluctuation contribution to the Raman response in superconducting cuprates / Caprara, Sergio; DI CASTRO, Carlo; Grilli, Marco; D., Suppa. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 95:11(2005), pp. 117004-1-117004-4. [10.1103/physrevlett.95.117004]
Charge-fluctuation contribution to the Raman response in superconducting cuprates
CAPRARA, SERGIO;DI CASTRO, Carlo;GRILLI, Marco;
2005
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
