Orbital magnetism in energy bands
Recent work on orbital magnetism in itinerant magnets is reviewed. It is shown that such an orbital contribution to the magnetic moment is particularly important for magnets involving actinide systems and that it is of a size comparable to the spin contribution. The results for the AnFe(2)(An=U, Np and Pu) compounds are discussed and their anomalous properties, as compared to corresponding standard rare-earth systems, are explained in terms of 3d-5f hybridisation and orbital polarisation within the 5f band manifold. CeFe(2) is discussed as an introduction to the AnFe(2) systems, for which 4f band magnetism is predicted in addition to the normal iron magnetism. It is most significant that, in agreement with experiment, the size of the iron moment is found to be reduced in comparison to its value in rare-earth magnets like YFe(2). The alpha-gamma transition in Ce metal is also treated and the calculated volume collapse agrees with experiment. Related calculations for Pr and Nd are also briefly discussed. Finally, the orbital contribution to the magnetism in Fe, Co and Ni is considered, and its maximum for Co is explained as due to the hcp crystal structure.
Bibliographic Reference: Paper presented: Electronic Structure in the 1990s, Bad Honef (DE), July 24-26, 1990
Availability: Available from (1) as Paper EN 35864 ORA
Record Number: 199110139 / Last updated on: 1994-12-02
Original language: en
Available languages: en