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Excitation spectrum gap and spin-wave velocity of XXZ Heisenberg chains: global renormalization-group calculation
The anisotropic XXZ spin-1/2 Heisenberg chain is studied using renormalization-group theory. The specific heats and nearest-neighbor spin-spin correlations are calculated throughout the entire temperature and anisotropy ranges in both ferromagnetic and antiferromagnetic regions, obtaining a global d
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