DOI: 10.1103/physrevb.73.054430
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Abstract: Accurate results are obtained for the low temperature magnetization versus magnetic field of Heisenberg spin rings consisting of an even number N of intrinsic spins s = 1/2, 1, 3/2, 2, 5/2, 3, 7/2 with nearest-neighbor antiferromagnetic (AF) exchange by employing a numerically exact quantum Monte Carlo method. A straightforward analysis of this data, in particular the values of the levelcrossing fields, provides accurate results for the lowest energy eigenvalue EN (S, s) for each value of the total spin quant…

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