Virtual phonon exchange between Kramers ions in a field theoretic formalism
- 14 December 1979
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 12 (23) , 5061-5075
- https://doi.org/10.1088/0022-3719/12/23/015
Abstract
The spectrum of a system of two ions interacting with each other through a boson reservoir is derived in a field theoretic formalism. The symmetries imposed by time reversal are investigated when the ions are of Kramers type. Virtual phonon exchange is found to give a natural explanation for the strong crystal-field dependence and for the anisotropy of the non-dipolar exchange interaction observed for Ce3+ ions in the lanthanide ethyl sulphates.Keywords
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