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S D Wilson, C R Rotundu, Z Yamani, P N Valdivia, B Freelon, E Bourret-Courchesne and R J Birgeneau. Universal magnetic and structural behaviors in the iron pnictides. Physical Review B, 81, p. 014501, 2010.

Abstract: Commonalities among the order parameters of the ubiquitous antiferromagnetism present in the parent
compounds of the iron arsenide high-temperature superconductors are explored. Additionally, comparison is
made between the well established two-dimensional Heisenberg-Ising magnet, K2NiF4 , and iron arsenide
systems residing at a critical point whose structural and magnetic phase transitions coincide. In particular,
analysis is presented regarding two distinct classes of phase-transition behavior reflected in the development of
antiferromagnetic and structural order in the three main classes of iron arsenide superconductors. Two distinct
universality classes are mirrored in their magnetic phase transitions which empirically are determined by the
proximity of the coupled structural and magnetic phase transitions in these materials.

Keywords: iron pnictide superconductors

URL: http://prb.aps.org/abstract/PRB/v81/i1/e014501

Posted by Costel R Rotundu

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