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Wick and Goldstone Theorems for General Spin; Antiferromagnetic Spin Waves. II
Phys. Rev. 148, 433 – Published 5 August, 1966
DOI: https://doi.org/10.1103/PhysRev.148.433
Abstract
The analogs of Wick's theorem and of Goldstone's theorem, proved in a previous paper for spin ½, are generalized to arbitrary spin. The proof is based on the Schwinger coupled-boson representation of spin operators. Quantum corrections to the spin-wave modes in antiferromagnets are again considered, and it is shown that these corrections can be expanded in powers of , where is the number of nearest neighbors. For large the factor presumably provides convergence, as assumed by Oguchi, whereas for the expansion parameter reduces to , as discussed in the preceding paper.
References (8)
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