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

Abstract

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 non-magnetic 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 non-magnetic impurities. Evidences that a new competing order is stabilized around the impurities, and in turn induces a re-entrance phase transition are reported. Implications for local magnetic measurement of the parent compound of iron pnictides are briefly discussed.

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Cited by in corpus (14)

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• Triangular antiferromagnet with nonmagnetic impurities
• Possible realization of an antiferromagnetic Griffiths phase in Ba[Fe(1-x)Mn(x)](2)As(2)
• Order from structural disorder in $XY$ pyrochlore antiferromagnet $\mathrm{E}{\mathrm{r}}_2\mathrm{T}{\mathrm{i}}_2{\mathrm{O}}_7$
• Emergent Potts order in the kagomé $J_1-J_3$ Heisenberg model
• Highly Dispersive Scattering From Defects In Non-Collinear Magnets
• The phase diagram of a frustrated Heisenberg model: from disorder to order and back again
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Protection against Spin Gap in 2-d Insulating Antiferromagnets with a Chern-Simons Term
• Random-bond disorder in two-dimensional non-collinear XY antiferromagnets: From quasi-long-range order to spin glass
• Chiral order emergence driven by quenched disorder
• Defect-induced spin textures in magnetic solids
• Stripe order in quasicrystals
• Emergence of novel magnetic order at finite temperature in overdoped pnictides