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arXiv:cond-mat/9603082 · Physical Review Letters

Critical Behavior of the S=3/2 Antiferromagnetic Heisenberg Chain

K. Hallberg, X. Q. G. Wang, Peter Horsch, Adriana Moreo

Published Jun 24, 1996• 88 citations
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Abstract

Using the density-matrix renormalization-group technique we study the long-wavelength properties of the spin $S\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3/2$ nearest-neighbor Heisenberg chain. We obtain an accurate value for the spin velocity $v\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3.87\ifmmode\pm\else\textpm\fi{}0.02$, in agreement with experiment. Our results show conclusively that the model belongs to the same universality class as the $S\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1/2$ Heisenberg chain, with a conformal central charge $c\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ and critical exponent $\ensuremath{\eta}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$.

DOI
10.1103/physrevlett.76.4955

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