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Antiferromagnetic Critical Fluctuations in BaFe₂As₂

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arxiv 1009.2116 v1 pith:USURWXJK submitted 2010-09-10 cond-mat.supr-con cond-mat.str-el

Antiferromagnetic Critical Fluctuations in BaFe₂As₂

Stephen D. Wilson , Z. Yamani , C. R. Rotundu , B. Freelon , P. N. Valdivia , E. Bourret-Courchesne , J. W. Lynn , Songxue Chi
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Tao Hong R. J. Birgeneau
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classification cond-mat.supr-con cond-mat.str-el
keywords bafecriticalbehaviorfluctuationsmagneticphaseanticipatedantiferromagnetic
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Magnetic correlations near the magneto-structural phase transition in the bilayer iron pnictide parent compound, BaFe$_2$As$_2$, are measured. In close proximity to the antiferromagnetic phase transition in BaFe$_2$As$_2$, 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 T$_N$. The potential role of two-dimensional critical fluctuations in the magnetic phase behavior of BaFe$_2$As$_2$ and their evolution near the anticipated crossover to three dimensional critical behavior and long-range order are discussed.

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