Journal Article

FZJ-2023-04487

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic structure of the two-dimensional XY antiferromagnet Sr$_2$CoSi$_2$O$_7$ studied using single-crystal neutron diffraction

Dutta, R. (Corresponding author) ; Thoma, H. ; Sazonov, A. ; Náfrádi, B. ; Meven, M.FZJ* ; Gukasov, A. ; Kocsis, V. ; Zeitler, U. ; Puri, A. ; Tokunaga, Y. ; Taguchi, Y. ; Tokura, Y. ; Bordács, S. ; Kézsmárki, I. ; Hutanu, V.

2023
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.107.014420  doi:10.34734/FZJ-2023-04487

Abstract: We report a combined polarized and unpolarized neutron diffraction study on a multiferroic Sr$_2$CoSi$_2$O$_7$ (SCSO) single crystal below and above the antiferromagnetic ordering temperature $T_N$ = 6.5 K. Unpolarized neutron diffraction measurements at 15 K confirm the melilite-type tetragonal $P\overline{4}2_1m$ space group as the parent structure of SCSO. The low temperature study at 2.3 K, in contrast, reveals symmetry lowering with the orthorhombic Cmm′2′ and $P2_12′_12′$ magnetic space groups being equally possible. In these $Cmm′2′$ and $P2_12′_12′$ magnetic space groups we obtain a very similar ordered magnetic moment about 2.86 and 2.94μB/Co$^{2+}$, respectively, which lies in the $ab$ plane. Our spin polarized flipping ratio measurements under an applied magnetic field of 6 T in the paramagnetic state support the results of our bulk magnetization data, indicating strong easy-plane spin anisotropy, responsible for the in-plane order below $T_N$.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd) ; Crystallography (2nd)

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Contributing Institute(s):

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

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

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

Appears in the scientific report 2023

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

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