Anticollinear magnetic order induced by impurities in the frustrated Heisenberg model of pnictides

  title={Anticollinear magnetic order induced by impurities in the frustrated Heisenberg model of pnictides},
  author={Cedric Weber and Fr{\'e}d{\'e}ric Mila},
  journal={Physical Review B},
We present Monte Carlo simulations for a classical antiferromagnetic Heisenberg model with both nearest (J(1)) and next-nearest (J(2)) exchange couplings on the square lattice in the presence of nonmagnetic impurities. We show that the order-by-disorder entropy selection, associated with the Ising-like phase transition that appears for J(2)/J(1) > 1/2 in the pure spin model, is quenched at low temperature due to the presence of nonmagnetic impurities. Evidence that a new competing order is… 

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