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Using the recently proposed density matrix renormalization group technique we show that the magnons in the S=1 antiferromagnetic Heisenberg chain effectively behave as bosons that condense at a critical field h₂. We determine the spin-wave velocity, v=2. 49 (1), as well as the gap =0. 4107 (1) J.
Sørensen et al. (Mon,) studied this question.
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