Drones, quasi-spin or iso-spin? A comparison of many-body techniques for general spin
- 1 February 1976
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 9 (2) , 187-195
- https://doi.org/10.1088/0305-4470/9/2/001
Abstract
For an effective-spin system with 2S+1 levels there are a number of possible mappings of spin onto pseudo-fermion operators. The relative merits of three of these methods are investigated by calculating to second order the dispersion relation for coupled spin-phonon modes in crystals containing S=1 effective spin impurities. The drone formalism quickly becomes intractable at higher spin values, as does the related quasi-spin formalism, in contrast with the iso-spin (or Abrikosov projection) formalism.Keywords
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