Answers are grounded in this paper and cite their sources.
A pedagogically useful method of obtaining a Heisenberg spin–spin interaction from a familiar many-electron Hamiltonian by means of ordinary degenerate perturbation theory is presented.
No takes yet. Share an insight, caveat, or question.
Cleveland et al. (1976) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: