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.
@article{arxiv.1011.2816,
title = {Antiferromagnetic ordering in the absence of a structural distortion in Ba(Fe{1-x}Mn{x})2As2},
author = {M. G. Kim and A. Kreyssig and A. Thaler and D. K. Pratt and W. Tian and J. L. Zarestky and M. A. Green and S. L. Bud'ko and P. C. Canfield and R. J. McQueeney and A. I. Goldman},
journal= {arXiv preprint arXiv:1011.2816},
year = {2010}
}
Comments
5 pages, 4 figures; accepted for publication in Phys. Rev. B Rapid Comm