Matsumoto, Masashige Normand, Bruce Rice, T. M. Sigrist, Manfred 2004-01-20 The magnon dispersion in the field-induced and pressure-induced antiferromagnetically (AF) ordered phase in TlCuCl₃ are studied. In the pressure-induced AF phase, there are two transverse phase (Goldstone) modes and one gapped longitudinal amplitude mode. A magnetic field lifts the degeneracy, and it gives rise to three separated magnon branches in the field-induced AF phase, where the lowest lying mode corresponds to a Goldstone mode. A model consisting of three distinct dimer sublattices is proposed to account for the plateaus which appear in magnetization curves of NH₄CuCl₃. application/pdf https://folia.unifr.ch/global/documents/299798 https://folia.unifr.ch/documents/299798/files/1_normand_mdf.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmmm.2003.12.1238 info:eu-repo/semantics/openAccess License undefined Journal of Magnetism and Magnetic Materials. - 2004, vol. 272-276, no. 1, p. 267-268 magnon quantum phase transition field-induced magnetic order pressure-induced magnetic order magnetization plateau info:eu-repo/classification/udc/53 Magnon dispersion in field-induced magnetically ordered phases http://purl.org/coar/resource_type/c_6501