Antiferromagnetic ordering in the absence of a structural distortion in Ba(Fe{1-x}Mn{x})2As2

M. G. Kim; A. Kreyssig; A. Thaler; D. K. Pratt; W. Tian; J. L. Zarestky; M. A. Green; S. L. Bud'ko; P. C. Canfield; R. J. McQueeney; A. I. Goldman

doi:10.1103/physrevb.82.220503

arXiv · 1011.2816

Antiferromagnetic ordering in the absence of a structural distortion in Ba(Fe{1-x}Mn{x})2As2

M. G. Kim·A. Kreyssig·A. Thaler·D. K. Pratt·W. Tian·J. L. Zarestky·M. A. Green·S. L. Bud'ko·P. C. Canfield·R. J. McQueeney·A. I. Goldman

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Abstract

Neutron and x-ray diffraction studies of Ba(Fe{1-x}Mn{x})2As2 for low doping concentrations (x <= 0.176) reveal that at a critical concentration, 0.102 < x < 0.118, the tetragonal-to-orthorhombic transition abruptly disappears whereas magnetic ordering with a propagation vector of (1/2 1/2 1) persists. Among all of the iron arsenides this observation is unique to Mn-doping, and unexpected because all models for "stripe-like" antiferromagnetic order anticipate an attendant orthorhombic distortion due to magnetoelastic effects. We discuss these observations and their consequences in terms of previous studies of Ba(Fe{1-x}TM{x})2As2 compounds (TM = Transition Metal), and models for magnetic ordering in the iron arsenide compounds.

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M. G. Kim, A. Kreyssig, A. Thaler, D. K. Pratt, W. Tian, J. L. Zarestky, M. A. Green, S. L. Bud'ko, P. C. Canfield, R. J. McQueeney, A. I. Goldman. 2010-11-12. Antiferromagnetic ordering in the absence of a structural distortion in Ba(Fe{1-x}Mn{x})2As2. https://doi.org/10.1103/physrevb.82.220503

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