Magnetic structure of the two-dimensional XY antiferromagnet Sr2CoSi2O7 studied using single-crystal neutron diffraction

  • We report a combined polarized and unpolarized neutron diffraction study on a multiferroic Sr2CoSi2O7 (SCSO) single crystal below and above the antiferromagnetic ordering temperature TN = 6.5 K. Unpolarized neutron diffraction measurements at 15 K confirm the melilite-type tetragonal P¯421m 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 P212′12′ magnetic space groups being equally possible. In these Cmm′2′ and P212′12′ magnetic space groups we obtain a very similar ordered magnetic moment about 2.86 and 2.94μB/Co2+, 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 TN.

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Author:Rajesh Dutta, Henrik Thoma, Andrew Sazonov, Bálint Náfrádi, Martin Meven, Arsen Gukasov, Vilmos Kocsis, Uli Zeitler, Alessandro Puri, Yusuke Tokunaga, Yasujiro Taguchi, Yoshinori Tokura, Sándor Bordács, István KézsmárkiORCiDGND, Vladimir Hutanu
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Parent Title (English):Physical Review B
Publisher:American Physical Society (APS)
Place of publication:College Park, MD
Year of first Publication:2023
Publishing Institution:Universität Augsburg
Release Date:2023/04/11
First Page:014420
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik V
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):Deutsches Urheberrecht