Magnon dispersion in field-induced magnetically ordered phases
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Matsumoto, Masashige
Theoretische Physik, ETH-Hönggerberg, Zürich, Switzerland
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Normand, Bruce
Physics Department, University of Fribourg, Switzerland
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Rice, T. M.
Theoretische Physik, ETH-Hönggerberg, Zürich, Switzerland
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Sigrist, Manfred
Theoretische Physik, ETH-Hönggerberg, Zürich, Switzerland
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Published in:
- Journal of Magnetism and Magnetic Materials. - 2004, vol. 272-276, no. 1, p. 267-268
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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/299798
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