Abstract:
Antiferromagnetic Heisenberg spin chains with various spin values (S=1/2,1,3/2,2,5/2) are studied numerically with the quantum Monte-Carlo method. Effective spin S chains are realized by ferromagnetically coupling n=2S antiferromagnetic spin chains with S=1/2. The temperature dependence of the uniform susceptibility, the staggered susceptibility, and the static structure factor peak intensity are computed down to very low temperatures, . The correlation length at each temperature is deduced from numerical measurements of the instantaneous spin-spin correlation function. At high temperatures, very good agreement with exact results for the classical spin chain is obtained independent of the value of S. For the S=2 chain which has a gap , the correlation length and the uniform susceptibility in the temperature range are well predicted by the semi-classical theory of Damle and Sachdev.
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Received: 23 December 1997 / Revised and Accepted: 11 March 1998
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Kim, Y., Greven, M., Wiese, UJ. et al. Monte-Carlo study of correlations in quantum spin chains at non-zero temperature. Eur. Phys. J. B 4, 291–297 (1998). https://doi.org/10.1007/s100510050382
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DOI: https://doi.org/10.1007/s100510050382