Figure 9.


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Poisson’s ratio for the hexagonal lattice with repelling magnets (a) and with attracting nearest neighbors (b) for values of k τ that allow changes in to change the sign of ν. k τ /k τo  = 10−0.1 (blue circles), k τ /k τo  = 10−0.2 (red squares), k τ /k τo  = 10−0.3 (black –), k τ /k τo  = 10−0.4 (red – –), k τ /k τo  = 10−0.5 (blue – ·), and k τ/k τo  = 10−0.6 (black diamonds).

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