Nature of the Magnetic Order in BaMn2As2

Details Nature of the Magnetic Order in BaMn2As2 Nature of the Magnetic Order in BaMn2As2

2009-07-23

arxiv.org/abs/0907.4094v2

Phys. Rev. B 80, 100403(R) (2009); 4 pages

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, 1 table; v2: additional discussion of Mn-Mn interactions; accepted for publication as a Rapid Communicatio

Scientific paper

10.1103/PhysRevB.80.100403

Neutron diffraction measurements have been performed on a powder sample of BaMn2As2 over the temperature T range from 10 K to 675 K. These measurements demonstrate that this compound exhibits collinear antiferromagnetic ordering below the Neel temperature T_N = 625(1) K. The ordered moment mu = 3.88(4) mu_B/Mn at T = 10 K is oriented along the c axis and the magnetic structure is G-type, with all nearest-neighbor Mn moments antiferromagnetically aligned. The value of the ordered moment indicates that the oxidation state of Mn is Mn^{2+} with a high spin S = 5/2. The T dependence of mu suggests that the magnetic transition is second-order in nature. In contrast to the closely related AFe2As2 (A = Ca, Sr, Ba, Eu) compounds, no structural distortion is observed in the magnetically ordered state of BaMn2As2.

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