The nature of the magnetic and structural phase transitions in BaFe${}_2$As${}_2$

Abstract

We present the results of an investigation of both the magnetic and structural phase transitions in a high quality single crystalline sample of the undoped, iron pnictide compound BaFe${}_2$As${}_2$. Both phase transitions are characterized via neutron diffraction measurements which reveal simultaneous, continuous magnetic and structural orderings with no evidence of hysteresis, consistent with a single second order phase transition. The onset of long-range antiferromagnetic order can be described by a simple power law dependence $\varphi (T{)}^2\propto (1-\frac{T}{T_N}{)}^{2\beta }$ with $\beta =0.103\pm 0.018$; a value near the $\beta =0.125$ expected for a two-dimensional Ising system. Biquadratic coupling between the structural and magnetic order parameters is also inferred along with evidence of three-dimensional critical scattering in this system.

New figure and discussion added. Length: 11 pages, 7 figures

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