Antiferromagnetic Critical Fluctuations in BaFe2As2
Abstract
Magnetic correlations near the magneto-structural 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.
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