Gyromagnetic Ratios of Metallic Samarium Compounds

In metallic rare-earth compounds the exchange interaction between the $4f$ shell and the conduction electrons causes a portion of the conduction-electron magnetization to be added to the magnetization of each rare-earth atom. Because these two magnetization components will, in general, have different gyromagnetic ratios, it follows that the gyromagnetic ratio of the whole material will differ from that of the rare-earth ions alone, which is given by the Landé factor. For the rare-earth metals apart from samarium, the resulting gyromagnetic ratio shifts are estimated to be of the order of 1%, too small to be detected by present experimental methods. However, an exploratory calculation suggests that the shift might be very large, perhaps of the order of 100%, in a samarium compound in which the interactions were of a strength comparable to those which are found in elemental samarium metal.