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We check the existence of a spontaneous magnetisation of Ising and Potts spins on semi-directed Barabasi-Albert networks by Monte Carlo simulations. We verify that the magnetisation for different temperatures T decays after a characteristic time τ(T), which we extrapolate to diverge at positive temperatures T  c (N) by a Vogel-Fulcher law, with T  c (N) increasing logarithmically with network size N.

Unusual ferromagnetism in Ising and Potts model on semi-directed Barabási-Albert networks