# Exact value of the ground state energy of the linear antiferromagnetic Heisenberg chain with nearest and next-nearest neighbour interactions

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- Elsevier Science
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## Abstract

It is shown that the ground state energy of the hamiltonian H = Σ Si · Si+1 + γΣSi · Si+2 for the linear antiferromagnetic Heisenberg chain with nearest and next-nearest neighbour interactions is equal to -3/2 if γ = 1/2.

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