Antiferromagnetic ordering in the absence of structural distortion in Ba(Fe1-xMnx)2As2

被引:81
|
作者
Kim, M. G. [1 ,2 ]
Kreyssig, A. [1 ,2 ]
Thaler, A. [1 ,2 ]
Pratt, D. K. [1 ,2 ]
Tian, W. [1 ,2 ]
Zarestky, J. L. [1 ,2 ]
Green, M. A. [3 ,4 ]
Bud'ko, S. L. [1 ,2 ]
Canfield, P. C. [1 ,2 ]
McQueeney, R. J. [1 ,2 ]
Goldman, A. I. [1 ,2 ]
机构
[1] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[3] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA
关键词
D O I
10.1103/PhysRevB.82.220503
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Neutron and x-ray diffraction studies of Ba(Fe1-xMnx)(2)As-2 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 "stripelike" 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(Fe1-xTMx)(2)As-2 compounds (TM = transition metal ), and models for magnetic ordering in the iron arsenide compounds.
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页数:4
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