Heisenberg exchange in heavy rare-earth alloys

It is shown that the highest ordering temperatures of heavy rare earths and alloys among the heavy rare earths follow the Heisenberg spin dependence $S(S+1\mathrm{})\mathrm{}$. The so-called anomalous behavior of alloys of heavy rare earths with Sc and Y is explained in terms of a combination of enhanced conduction-electron polarization and conduction-electron scattering by solute atoms.