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Autori: S D Wilson, Z Yamani, C R Rotundu, B Freelon, P N Valdivia, E Bourret-Courchesne, J W Lynn, Songxue Chi, Tao Hong, and R J Birgeneau
Editorial: APS, Physical Review B, 82, p.144502, 2010.
Magnetic correlations near the magnetostructural phase transition in the bilayer iron-pnictide parent compound, BaFe2As2, are measured. In close proximity to the antiferromagnetic phase transition in BaFe2As2, a crossover to three-dimensional critical behavior is anticipated and has been preliminarily observed. Here we report complementary measurements of two-dimensional magnetic fluctuations over a broad temperature range about TN. The potential role of two-dimensional critical fluctuations in the magnetic phase behavior of BaFe2As2 and their evolution near the anticipated crossover to three-dimensional critical behavior and long-range order are discussed.
Cuvinte cheie: BaFe2As2