Abstract
The ground-state wave function for an antiferromagnetic spin array, corresponding to the Hamiltonian H = Jσ (neighbors) S i . S j , has been approximated by a simple linear combination of those basis vectors that can be derived from the idealized Néel ground state by transferring a few spin deviations between neighboring spins. The resulting wave function is very nearly an eigenfunction of H, the corresponding energy is λ 0=−[1+(2ZS−1) −1] JZNS 2 2 ,and the fractional spin alignment is θ= {1−ZS (2Z−1) 2 . The energy is very close to that given by the spin-wave approximation, but the fractional spin alignment lies about halfway between the spin-wave value and unity.
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