Phasons, amplitude modes, and spin waves in the amplitude-modulated magnetic phase of PrNi2Si2

J. A. Blanco,1 B. Fåk,2 J. Jensen,3 M. Rotter,4 A. Hiess,5,* D. Schmitt,6 and P. Lejay7 1Departamento de Fı́sica, Universidad de Oviedo, E-33007 Oviedo, Spain 2SPSMS, UMR-E CEA/UJF-Grenoble-1, INAC, 38054 Grenoble Cedex 9, France 3Niels Bohr Institute, Universitetsparken 5, DK-2100 Copenhagen, Denmark 4Max-Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany 5Institut Laue Langevin, 156X, 38042 Grenoble cedex 9, France 6ISTerre, CNRS, Université de Grenoble 1, F-38041 Grenoble, France 7Institut Néel, CNRS, BP 166, 38042 Grenoble Cedex 9, France (Received 18 December 2012; revised manuscript received 18 January 2013; published 20 March 2013)