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Abstract

In this chapter, we will review the knowledge which has been accumulated over the last few years on spin waves in the rare earth metals, and describe the way in which this information may be interpreted to elucidate the magnetic interactions which give rise to their characteristic magnetically ordered structures. Most of the discussion will be concerned with the hcp heavy rare earths, since the magnetic excitations in the light rare earths, which are complicated by strong crystal field effects, have not yet been extensively studied. Recent measurements on praseodymium will, however, be briefly described. The great majority of the information which has been obtained about the dispersion relations for the spin wave quanta, or magnons, has resulted from inelastic neutron scattering experiments since these allow, in principle and often even in practice, the determination of the magnon energy at any point in the Brillouin zone, as well as providing much valuable additional information about magnon interactions. An important supplementary technique is provided by the absorption of electromagnetic waves, which, however, only determines the magnon energies at certain high symmetry points within the zone. In addition, some information may be obtained from the low-temperature thermodynamic and transport properties, although the number of explicit features of the magnon dispersion relations which can be deduced from them is extremely limited. However, they do provide a useful check on the consistency of the measured or calculated magnon spectrum.

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Mackintosh, A.R., Møller, H.B. (1972). Spin Waves. In: Elliott, R.J. (eds) Magnetic Properties of Rare Earth Metals. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-5691-3_5

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  • DOI: https://doi.org/10.1007/978-1-4757-5691-3_5

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