Journal Article

FZJ-2020-04705

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe2As2

Liu, P. ; Klemm, M. L. ; Tian, L. ; Lu, X. (Corresponding author)Extern* ; Song, Y. ; Tam, D. W.Extern* ; Schmalzl, K.FZJ* ; Park, J. T.MLZ* ; Li, Y. ; Tan, G.Extern* ; Su, Y.FZJ* ; Bourdarot, F.Extern* ; Zhao, Y.Extern* ; Lynn, J. W.Extern* ; Birgeneau, R. J.Extern* ; Dai, P. (Corresponding author)

2020
Nature Publishing Group UK [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/26283  doi:10.1038/s41467-020-19421-5

Abstract: 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

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. JCNS-ILL (JCNS-ILL)
3. Heinz Maier-Leibnitz Zentrum (MLZ)
4. Streumethoden (JCNS-2)
5. Streumethoden (PGI-4)
6. JARA-FIT (JARA-FIT)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 144 - Controlling Collective States (POF3-144) (POF3-144)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2020

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