Magnon dispersion in field-induced magnetically ordered phases

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:272

Article; Proceedings Paper

Matsumoto, M ; Normand, B ; Rice, TM ; Sigrist, M

关键词: magnon;    quantum phase transition;    field-induced magnetic order;    pressure-induced magnetic order;    magnetization plateau;   

DOI  :  10.1016/j.jmmm.2003.12.1238

来源: Elsevier

【 摘 要 】

The magnon dispersion in the field-induced and pressure-induced antiferromagnctically (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. (C) 2003 Published by Elsevier B.V.

【 授权许可】

Free