| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|
|---|---|---|
| Page(s) | C8-293 - C8-294 | |
| DOI | https://doi.org/10.1051/jphyscol:19888131 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-293-C8-294
DOI: 10.1051/jphyscol:19888131
Theoretische Physik, Universität Duisburg and SFB 166, Postfach 101629 D-4100 Duisburg 1/F.R.G
J. Phys. Colloques 49 (1988) C8-293-C8-294
DOI: 10.1051/jphyscol:19888131
LANDAU DESCRIPTION OF VOLUME INSTABILITIES IN ITINERANT MAGNETIC SYSTEMS
P. Entel et M. SchröterTheoretische Physik, Universität Duisburg and SFB 166, Postfach 101629 D-4100 Duisburg 1/F.R.G
Abstract
Long lasting discussions about the INVAR effect involve a two-spin-state model. Recent measurements [1] and band-structure calculations [2] seem to confirm low-spin and high-spin phases in Fe-INVAR alloys. We interpret the results of the band structure calculations in terms of an effective Ginzburg-Landau model. We obtain the temperature dependence of magnetization and thermal expansion by applying the functional integral method to this statistical model.