Abstract
The great variety of unusual phenomena exhibited by the rare earth metals has made them a subject of much interest to experimentalists and theorists alike. In addition to their somewhat exotic magnetic structures, they also possess unusual (often “anomalous”) electrical and optical behavior, as is clear from other chapters in this book, which is associated with and related to their magnetic ordering properties. The response of theory to the challenge posed by this wealth of experimental results has been slow and late in coming. In the absence of any detailed knowledge about the electronic band structure of these metals, theoretical workers focused their efforts within the framework of a free-electron model.(1, 2) From this early work there emerged a body of fundamental ideas regarding the origin of magnetic ordering in these systems and the basic interactions responsible for the anomalous properties observed below the magnetic ordering temperature. That these theories were so successful in providing a qualitative understanding of some of the fundamental properties of the rare earth metals is due mostly to the ingenuity of the physical methods employed, and to some degree, as we shall see, to fortuitous circumstances.
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Freeman, A.J. (1972). Energy Band Structure, Indirect Exchange Interactions and Magnetic Ordering. In: Elliott, R.J. (eds) Magnetic Properties of Rare Earth Metals. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-5691-3_6
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