Magnetic order in BaMn₂As₂ from neutron diffraction measurements

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Yogesh Singh,¹ M. A. Green,^2,3 Q. Huang,^2,3 A. Kreyssig,¹ R. J. McQueeney,¹ D. C. Johnston,¹ and A. I. Goldman¹
¹Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
²NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
³Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

Received 22 July 2009; published 14 September 2009

Neutrondiffraction measurements have been performed on a powder sample ofBaMn₂As₂ over the temperature T range from 10 to 675K. These measurements demonstrate that this compound exhibits collinear antiferromagneticordering below the Néel temperature T_N=625(1) K. The ordered moment µ=3.88(4)µ_B/Mnat T=10 K is oriented along the c axis and themagnetic structure is G type, with all nearest-neighbor Mn momentsantiferromagnetically aligned. The value of the ordered moment indicates thatthe oxidation state of Mn is Mn²⁺ with a highspin S=5/2. The T dependence of µ suggests that themagnetic transition is second order in nature. In contrast tothe closely related AFe₂As₂ (A=Ca, Sr, Ba, and Eu) compounds,no structural distortion is observed in the magnetically ordered stateof BaMn₂As₂. Our results indicate that while next-nearest-neighbor interactions areimportant in the AFe₂As₂ materials, nearest-neighbor interactions are dominant inBaMn₂As₂.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.100403
DOI:	10.1103/PhysRevB.80.100403
PACS:	75.25.+z; 75.30.Kz; 75.50.Ee 75.25.+z Spin arrangements in magnetically ordered materials 75.30.Kz Magnetic phase boundaries 75.50.Ee Antiferromagnetics YEAR: 2009
KEYWORDS:	antiferromagnetic materials, arsenic alloys, barium alloys, magnetic moments, magnetic structure, magnetic transitions, manganese alloys, Neel temperature, neutron diffraction

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