Publication year
2006Source
Journal of Physics : Condensed Matter, 18, 31, (2006), pp. 7209-7225ISSN
Publication type
Article / Letter to editor

Display more detailsDisplay less details
Organization
Theory of Condensed Matter
Journal title
Journal of Physics : Condensed Matter
Volume
vol. 18
Issue
iss. 31
Page start
p. 7209
Page end
p. 7225
Subject
Theory of Condensed MatterAbstract
Ferromagnetism with high Curie temperature T-c, well above room temperature, and very small saturation moment has been reported in various carbon and boron systems. It is argued that the magnetization must be very inhomogeneous with only a small fraction of the sample ferromagnetically ordered. It is shown that a possible source of high T-c within the ferromagnetic regions is itinerant electrons occupying a narrow impurity band. Correlation effects do not reduce the effective interaction which enters the Stoner criterion in the same way as in a bulk band. It is also shown how, in the impurity band case, spin wave excitations may not be effective in lowering T-c below its value given by Stoner theory. These ideas are applied to CaB6 and a thorough review of the experimental situation in this material is given. It is suggested that the intrinsic magnetism of the B-2 and O-2 dimers might be exploited in suitable structures containing these elements.
This item appears in the following Collection(s)
- Academic publications [205104]
- Electronic publications [103316]
- Faculty of Science [32347]
- Open Access publications [71823]
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.