Magnon dispersion in field-induced magnetically ordered phases

Matsumoto, Masashige; Normand, Bruce; Rice, T. M.; Sigrist, Manfred

doi:10.1016/j.jmmm.2003.12.1238

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Journal article

Magnon dispersion in field-induced magnetically ordered phases

Matsumoto, Masashige Theoretische Physik, ETH-Hönggerberg, Zürich, Switzerland
Normand, Bruce Physics Department, University of Fribourg, Switzerland
Rice, T. M. Theoretische Physik, ETH-Hönggerberg, Zürich, Switzerland
Sigrist, Manfred Theoretische Physik, ETH-Hönggerberg, Zürich, Switzerland

20.01.2004

Published in:

Journal of Magnetism and Magnetic Materials. - 2004, vol. 272-276, no. 1, p. 267-268

pressure-induced magnetic order

English 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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language