Volume 111, Number 5, September 2015
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||14 September 2015|
Muon spin rotation study of the magnetic structure in the tetragonal antiferromagnetic state of weakly underdoped Ba1−xKxFe2As2
1 University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials Chemin du Musée 3, CH-1700 Fribourg, Switzerland
2 O. O. Galkin Donetsk Institute for Physics and Engineering NAS of Ukraine - 03680 Kyiv, Ukraine
3 Institute of Solid State Physics, Karlsruhe Institute of Technology - Postfach 3640, Karlsruhe 76021, Germany
Received: 20 August 2015
Accepted: 26 August 2015
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.
PACS: 76.75.+i – Muon spin rotation and relaxation / 74.25.Ha – Magnetic properties including vortex structures and related phenomena / 74.70.Xa – Pnictides and chalcogenides
© EPLA, 2015
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