Induced magnetic ordering transition in RCo5 type materials

• A numerical calculations scheme, that simulates induced transition magnetic ordering in R1−yYyCo3B2 and R(Co1−xNix)5 type materials, is set up.
• The observed ordered magnetic moment of the R sub-lattice, as function of the magnetic exchange field, and as function of temperature, is shown to agree with induced transition theory, and not with Curie–Weiss theory.
• In R1−yYyCo3B2, the relative magnitudes of the crystalline electric field and the magnetic exchange field are just above the critical threshold for induced transition ordering, making them the best experimental ‘realization’ found so far.

The magnetism in several materials of the RCo5 type is studied. A numerical calculation scheme, based on an induced magnetic ordering transition, is set up. Using this scheme, and previously reported crystalline electric and magnetic exchange fields parameters, the magnetic structure in R1−yYyCo3B2 and R(Co1−xNix)5 materials (R=Tb and Ho), and its temperature evolution, is calculated, and compared with the corresponding observed results. It is proposed that the magnetic order in the materials of the RCo5 type, with R3+ of integral J, is driven by an induced transition.