Soft modes in singlet ground state ferromagnets
- 26 June 1972
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 5 (12) , L157-L161
- https://doi.org/10.1088/0022-3719/5/12/006
Abstract
The behaviour of magnetic excitons as a function of temperature is studied in cubic systems which have a ferromagnetic phase transition due to the exchange coupling between a singlet ground state and a triply degenerate excited state. The nature of the soft mode is discussed and found to be a zero-frequency electronic mode. It is shown that the singlet-triplet excitons do not exhibit full soft mode behaviour at Tc, and that the theory accounts qualitatively for the measurements of Birgeneau et al (1971) on Pr3Tl and FCC Pr.Keywords
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