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Order versus disorder in the quantum Heisenberg antiferromagnet on the<b><i>kagomé</i></b>lattice using exact spectra analysis
A group symmetry analysis of the low lying levels of the spin-1/2 kagom\'e Heisenberg antiferromagnet is performed for small samples up to N=27. This approach allows to follow the effect of quantum fluctuations when the sample size increases. The results contradict the scenario of ``order by disorder'' which has been …