Orbital effects in rare earth magnetism

Abstract Rare earth materials show a fascinating variety of magnetic behavior. This is true for the elemental metals, their alloys, and compounds. These lectures will emphasize those aspects of rare earth magnetic behavior in which the crystallattice acting through the large orbital contribution to the rare earth moments significantly affects the nature of the magnetic behavior. In addition to the rare earth elemental metals, certain rare earth intermetallic compounds where the cry s t al-ele c t ric-field profoundly alters the magnetic behavior will be discussed.