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

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

2010-09-10

arxiv.org/abs/1009.2116v1

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures; Accepted for publication in Physical Review B

Scientific paper

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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