Chapter 3 Formation of 3d-moments and spin fluctuations in some rare-earth-cobalt compounds

Abstract

Publisher Summary This chapter discusses the formation of 3D-moments and spin fluctuations in some rare-earth-cobalt compounds. In combination with large magnetovolume effects, these compounds exhibit a number of characteristic properties that make them suitable for checking various physical theories. The chapter focuses on Co-based Laves phase compounds and describes the itinerant-electron metamagnetism (IEMM) in various materials. The chapter discusses the magnetic properties of the systems consisting of both itinerant electrons and localized spins are formulated based on the s–d model. The effects of spin fluctuations on the magnetic behavior, heat capacity, and magnetoresistance are also reviewed in the chapter. The 4f–3d exchange interaction and its effect on the induced Co-metamagnetic behavior is presented for the magnetic rare-earth-Co 2 compounds. The role of the magnetic R-atom and the influence of the 3d electrons affecting the character of the magnetic phase transitions and spin fluctuation scattering are discussed.