Journal Article

FZJ-2019-06313

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spin reorientation in FeCrAs revealed by single-crystal neutron diffraction

Jin, W. T. (Corresponding author) ; Meven, M.FZJ*RWTH* ; Deng, H.FZJ*RWTH* ; Su, Y.FZJ* ; Wu, W. ; Julian, S. R. ; Kim, Y.-J. (Corresponding author)

2019
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/23640  doi:10.1103/PhysRevB.100.174421

Abstract: The magnetic structure of the “nonmetallic metal” FeCrAs, a compound with the characters of both metals and insulators, was examined as a function of temperature using single-crystal neutron diffraction. The magnetic propagation vector was found to be k=(1/3,1/3,0), and the magnetic reflections disappeared above TN=116(1)K. In the ground state, the Cr sublattice shows an in-plane spiral antiferromagnetic order. The moment sizes of the Cr ions were found to be small due to strong magnetic frustration in the distorted kagome lattice or the itinerant nature of the Cr magnetism and vary between 0.8 and 1.4μB on different sites as expected for a spin-density-wave- (SDW-) type order. The upper limit of the moment on the Fe sublattice is estimated to be less than 0.1μB. With increasing temperature up to 95 K, the Cr moments cant out of the ab plane gradually with the in-plane components being suppressed and the out-of-plane components increasing in contrast. This spin reorientation of Cr moments can explain the dip in the c-direction magnetic susceptibility and the kink in the magnetic order parameter at TO∼100K, a second magnetic transition which was ignored before. We have also discussed the similarity between FeCrAs and the model itinerant magnet Cr, which exhibits spin-flip transitions and SDW-type antiferromagnetism.

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

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)

Research Program(s):

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

Experiment(s):

1. HEiDi: Single crystal diffractometer on hot source (SR9b)

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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