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

Abstract

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.

arXiv comment6 pages, 4 figures; Accepted for publication in Physical Review B

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• On infrared pseudogap in cuprate and pnictide high-temperature superconductors
• Short-range nematic fluctuations in Sr1-xNaxFe2As2 superconductors
• From Ising resonant fluctuations to static uniaxial order in antiferromagnetic and weakly superconducting CeCo(In${}_{1-x}$Hg${}_x$)${}_5$ ($x$=0.01)
• Widespread orthorhombic fluctuations in the (Sr,Na)Fe${}_2$As${}_2$ family of superconductors
• Tuning magnetism in FeAs-based materials via tetrahedral structure
• In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe${}_2$As${}_2$
• Magnetism of the Fe${}^{2+}$ and Ce${}^{3+}$ sublattices in Ce${}_2$O${}_2$FeSe${}_2$: a combined neutron powder diffraction, inelastic neutron scattering and density functional study
• Optical observation of spin-density-wave fluctuations in Ba122 iron-based superconductors
• Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2 As2
• Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet
• Competition of three-dimensional magnetic phases in Ca${}_2$Ru${}_{1-x}$Fe${}_x$O${}_4$: A structural perspective