Low-temperature Raman scaterring of PMN-PT close to the morphotropic   phase boundary
  This paper has been withdrawn by the author due to a crucial sign error in equation. 
J.A. Lima Jr., W. Paraguassub, P. T. C. Freirea, A. G. Souza Filhoa,   F. E. A. Meloa, J. Mendes Filhoa, M.H. Lentec, D. Gar...