Magnon Contribution to the Low‐Temperature Specific Heat of UO2
- 1 January 1967
- journal article
- research article
- Published by Wiley in Physica Status Solidi (b)
- Vol. 19 (1) , 77-88
- https://doi.org/10.1002/pssb.19670190108
Abstract
The contribution of acoustical phonons to the low‐temperature specific heat of UO2, as calculated from the single crystal elastic constants, is much too small to account for the observed heat capacity. It is shown here that this data can however be explained in terms of antiferromagnetic magnons. An expression for the heat capacity due to spin waves is derived, firstly for a simple antiferromagnet having a spherically symmetric dispersion relation, and secondly for UO2, where the dispersion relation is cylindrically symmetrie. For UO2 it is found that the next nearest neighbour interactions must be included in order to obtain a meaningful dispersion relation.Keywords
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