%0 Journal Article
%A Liu, Panpan
%A Klemm, Mason L.
%A Tian, Long
%A Lu, Xingye
%A Song, Yu
%A Tam, David W.
%A Schmalzl, Karin
%A Park, J. T.
%A Li, Yu
%A Tan, Guotai
%A Su, Yixi
%A Bourdarot, Frédéric
%A Zhao, Yang
%A Lynn, Jeffery W.
%A Birgeneau, Robert J.
%A Dai, Pengcheng
%T In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe2As2
%J Nature Communications
%V 11
%N 1
%@ 2041-1723
%C [London]
%I Nature Publishing Group UK
%M FZJ-2020-04705
%P 5728
%D 2020
%X A small in-plane external uniaxial pressure has been widely used as an effective method to acquire single domain iron pnictide BaFe2As2, which exhibits twin-domains without uniaxial strain below the tetragonal-to-orthorhombic structural (nematic) transition temperature Ts. Although it is generally assumed that such a pressure will not affect the intrinsic electronic/magnetic properties of the system, it is known to enhance the antiferromagnetic (AF) ordering temperature TN ( < Ts) and create in-plane resistivity anisotropy above Ts. Here we use neutron polarization analysis to show that such a strain on BaFe2As2 also induces a static or quasi-static out-of-plane (c-axis) AF order and its associated critical spin fluctuations near TN/Ts. Therefore, uniaxial pressure necessary to detwin single crystals of BaFe2As2 actually rotates the easy axis of the collinear AF order near TN/Ts, and such effects due to spin-orbit coupling must be taken into account to unveil the intrinsic electronic/magnetic properties of the system
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 33184278
%U <Go to ISI:>//WOS:000593979700001
%R 10.1038/s41467-020-19421-5
%U https://juser.fz-juelich.de/record/888131