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Some recent local spin density electronic structure calculations for a number of ferromagnetic rare-earth systems are reviewed. A simplified model of the level densities for rare-earth (R) transition metal (M) intermetallic compounds, R(m)M(n), is used to describe in a simple way the main features of their basic electronic structure. Explicit calculations for LuFe(2) and RFe(2) (where R = Gd-Yb) are presented from which the K(RM) exchange coupling constant can be calculated. An induced 4f itinerant magnetism is predicted from the electronic structure of the anomalous ferromagnets CeFe(2) and CeCo(5). In cerium metal, the 4f electrons on one side of the gamma-alpha transition are found to be non-bonding whereas on the other side of the transition they contribute to the metallic bonding. This leads to a 10% collapse in volume. Other recent calculations also support the view that the 4f electrons in alpha-cerium are itinerant. This suggests that the gamma-alpha phase transformation is caused by a Mott transition of the 4f electrons.

Additional information

Authors: JOHANSSON B, Uppsala University, Physics Department (SE);NORDSTRÖM L, Uppsala University, Physics Department (SE);ERIKSSON O, Uppsala University, Physics Department (SE);BROOKS M S S, JRC Karlsruhe (DE);NORDSTROM L, Uppsala University, Physics Department (SE)
Bibliographic Reference: Article: Physica Scripta, Vol. T39 (1991) pp. 100-109
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