  On directed Barabasi-Albert networks with two and seven neighbours selected
by each added site, the Ising model was seen not to show a spontaneous
magnetisation. Instead, the decay time for flipping of the magnetisation
followed an Arrhenius law for Metropolis and Glauber algorithms, but for Wolff
cluster flipping the magnetisation decayed exponentially with time. On these
networks the Majority-vote model with noise is now studied through Monte Carlo
simulations. However, in this model, the order-disorder phase transition of the
order parameter is well defined in this system. We calculate the value of the
critical noise parameter q_c for several values of connectivity z of the
directed Barabasi-Albert network. The critical exponents beta/nu., gamma/nu and
1/nu were calculated for several values of z.
