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Antiferromagnetic Critical Fluctuations in BaFe$_2$As$_2$

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.

preprint2010arXivOpen access
Stephen D. WilsonZ. YamaniC. R. RotunduB. FreelonP. N. ValdiviaE. Bourret-CourchesneJ. W. LynnSongxue ChiTao HongR. J. Birgeneau
cond-mat.supr-concond-mat.str-el
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Open access10 authors2 topics
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Stephen D. WilsonZ. YamaniC. R. RotunduB. FreelonP. N. ValdiviaE. Bourret-CourchesneJ. W. LynnSongxue ChiTao HongR. J. Birgeneau

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