We calculate the optical and Raman response within a phenomenological model of fermion quasiparticles coupled to nearly critical collective modes. We find that, whereas critical scaling properties might be masked in optical spectra due to charge conservation, distinct critical signatures of charge and spin fluctuations can be detected in Raman spectra exploiting specific symmetry properties. We compare our results with recent experiments on the cuprates. (C) 2008 Elsevier Ltd. All rights reserved.
Low-energy signatures of charge and spin fluctuations in Raman and optical spectra of the cuprates / Caprara, Sergio; DI CASTRO, Carlo; T., Enss; Grilli, Marco. - In: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS. - ISSN 0022-3697. - 69:9(2008), pp. 2155-2159. (Intervento presentato al convegno 4th International Conference on Study of Matter at Extreme Conditions tenutosi a Miami Beach, FL nel APR 15-20, 2007) [10.1016/j.jpcs.2008.03.038].
Low-energy signatures of charge and spin fluctuations in Raman and optical spectra of the cuprates
CAPRARA, SERGIO;DI CASTRO, Carlo;GRILLI, Marco
2008
Abstract
We calculate the optical and Raman response within a phenomenological model of fermion quasiparticles coupled to nearly critical collective modes. We find that, whereas critical scaling properties might be masked in optical spectra due to charge conservation, distinct critical signatures of charge and spin fluctuations can be detected in Raman spectra exploiting specific symmetry properties. We compare our results with recent experiments on the cuprates. (C) 2008 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
