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Muon spin rotation study of the magnetic structure in the tetragonal antiferromagnetic state of weakly underdoped Ba1−xKxFe2As2

With muon spin rotation (μSR) we studied the transition between the orthorhombic antiferromagnetic (o-AF) and the tetragonal antiferromagnetic (t-AF) states of a weakly underdoped Ba1−xKxFe2As2 single crystal. We observed some characteristic changes of the magnitude and the orientation of the magnet...

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Bibliographic Details
Published in:Europhysics letters 2015-09, Vol.111 (5), p.57001
Main Authors: Mallett, B. P. P., Pashkevich, Yu. G., Gusev, A., Wolf, Th, Bernhard, C.
Format: Article
Language:English
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Summary:With muon spin rotation (μSR) we studied the transition between the orthorhombic antiferromagnetic (o-AF) and the tetragonal antiferromagnetic (t-AF) states of a weakly underdoped Ba1−xKxFe2As2 single crystal. We observed some characteristic changes of the magnitude and the orientation of the magnetic field at the muon site which, due to the fairly high point symmetry of the latter, allow us to identify the magnetic structure of the t-AF state. It is the so-called, inhomogeneous double-Q magnetic structure with c-axis-oriented moments which has a vanishing magnetic moment on half of the Fe sites.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/111/57001