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Physical review B
The Mermin-Wagner theorem prevents the stabilization of long-range magnetic order in two-dimensional layered materials, such as the pnictide superconductors, unless the magnetism is associated with a discrete symmetry breaking. A typical known example is the discrete row and column collinear magnetic state that emerges in doped iron pnictide materials due to an order-by-disorder mechanism. In these compounds, the magnetic state competes with superconductivity and the mechanism that stabilizesdoi:10.1103/physrevb.99.214439 fatcat:t7a6ih7vzrdnzmaxiaqzf6as2q