GROUND-STATE OF THE ANTI-FERROMAGNETIC HEISENBERG CHAIN WITH NEAREST-NEIGHBOR AND NEXT-NEAREST-NEIGHBOR INTERACTIONS
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Improved upper bounds to the ground-state energy are reported for the linear-chain antiferromagnetic spin- 1 2 Heisenberg model with both first- and second-nearest-neighbor interactions. In addition estimates of a ground-state long-range-order parameter relevant to spin-Peierls transitions are given. 1982.