Antiferromagnetic critical fluctuations in ${\text{BaFe}}_{2}{\text{As}}_{2}$

Antiferromagnetic critical fluctuations in ${BaFe}_{2} {As}_{2}$

Stephen D. Wilson, Z. Yamani, C. R. Rotundu, B. Freelon, P. N. Valdivia, E. Bourret-Courchesne, J. W. Lynn, Songxue Chi, Tao Hong, and R. J. Birgeneau

Phys. Rev. B 82, 144502 – Published 6 October 2010

Abstract

Magnetic correlations near the magnetostructural 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.

Received 18 May 2010

DOI:https://doi.org/10.1103/PhysRevB.82.144502

Authors & Affiliations

Stephen D. Wilson^1,2,*, Z. Yamani³, C. R. Rotundu¹, B. Freelon⁴, P. N. Valdivia⁵, E. Bourret-Courchesne¹, J. W. Lynn⁶, Songxue Chi^6,7, Tao Hong⁸, and R. J. Birgeneau^1,4,5

¹Materials Science Division, Lawrence Berkeley National Lab, Berkeley, Caifornia 94720, USA
²Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
³Chalk River Laboratories, Canadian Neutron Beam Centre, National Research Council, Chalk River, Ontario, Canada K0J 1P0
⁴Physics Department, University of California, Berkeley, California 94720, USA
⁵Materials Science Department, University of California, Berkeley, California 94720, USA
⁶NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
⁷Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
⁸Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA

^*stephen.wilson@bc.edu

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Vol. 82, Iss. 14 — 1 October 2010

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Physical Review B

covering condensed matter and materials physics

Antiferromagnetic critical fluctuations in ${BaFe}_{2} {As}_{2}$

Stephen D. Wilson, Z. Yamani, C. R. Rotundu, B. Freelon, P. N. Valdivia, E. Bourret-Courchesne, J. W. Lynn, Songxue Chi, Tao Hong, and R. J. Birgeneau

Phys. Rev. B 82, 144502 – Published 6 October 2010

Abstract

Authors & Affiliations

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Physical Review B

covering condensed matter and materials physics

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, Tao Hong, and R. J. Birgeneau

Phys. Rev. B 82, 144502 – Published 6 October 2010

Abstract

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Antiferromagnetic critical fluctuations in ${BaFe}_{2} {As}_{2}$