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We present a number of arguments in favour of the suggestion that the Marshall-Peierls sign rule survives the frustration in the square-lattice Heisenberg antiferromagnet with frustrating next-nearest-neighbour (diagonal) bonds ( J 1 - J 2 model) for relatively large values of the parameter J 2 / J 1 . Both the spin-wave analysis and the exact-diagonalization data concerning the weight of Marshall states support the above suggestion.
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Richter et al. (1994) studied this question.
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