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00925njm 22002777a 4500 dc Manjón, F. J. author Marí, B. author Romero, A. H. author Serrano Gutiérrez, Jorge author 2005 Anomalous Raman modes have been reported in several recent papers dealing with doped- and undoped-ZnO layers grown by different methods. Most of these anomalous Raman modes have been attributed to local vibrational modes of impurities or defects. However, we will show that most of the observed modes correspond to wurtzite-ZnO silent modes allowed by the breakdown of the translational crystal symmetry induced by defects and impurities. J. Appl. Phys. 97, 053516 (2005) 0021-8979 https://uvadoc.uva.es/handle/10324/65330 10.1063/1.1856222 5 Journal of Applied Physics 97 1089-7550 Silent Raman modes in zinc oxide and related nitrides