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5f derived bands of light actinide metals have a width of several volts and a self-consistent band structure. Density functional techniques have been used to calculate trends in lattice constant and cohesive energy. It has become clear that relativistic effects, in particular spin-orbit coupling, do affect the cohesive properties by raising the lattice parameter and lowering the bulk modulus. However, the actinide metals are paramagnets, and it is their compounds that must be used to examine the effects of spin-orbit coupling upon magnetism. For UN it was shown that both the shape of the magnetic form factor and the presence of very large magnetic anisotropy could be explained within an itinerant electron theory. The calculated total moment was, however, only 0.5 microB, compared with an experimental value of 0.75 microB. Since the discrepancy could have been due to the assumed ferromagnetic ground state, similar calculations have since been made for the ferromagnets US to UTe. In all cases the calculated orbital moment is larger than, and parallel to, the spin component of the moment.

Additional information

Authors: BROOKS M S S, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: Many Body Effects in Strongly Correlated Ground States, Cambridge (GB), Feb. 28 - March 1, 1991
Availability: Available from (1) as Paper EN 36379 ORA
Record Number: 199111351 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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