The Two-Dimensional S=1 Quantum Heisenberg Antiferromagnet at Finite Temperatures

Details The Two-Dimensional S=1 Quantum Heisenberg Antiferromagnet at Finite Temperatures The Two-Dimensional S=1 Quantum Heisenberg Antiferromagnet at Finite Temperatures

1997-12-25

arxiv.org/abs/cond-mat/9712292v3

J. Phys. Soc. Jpn. 67 (1998) 1130

Physics

Condensed Matter

Statistical Mechanics

4 Pages, 1 table, 4 figures

Scientific paper

10.1143/JPSJ.67.1130

The temperature dependence of the correlation length, susceptibilities and the magnetic structure factor of the two-dimensional spin-1 square lattice quantum Heisenberg antiferromagnet are computed by the quantum Monte Carlo loop algorithm (QMC). In the experimentally relevant temperature regime the theoretically predicted asymptotic low temperature behavior is found to be not valid. The QMC results however, agree reasonably well with the experimental measurements of La2NiO4 even without considering anisotropies in the exchange interactions.

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