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| Home > Publications database > Magnetic structure of the two-dimensional XY antiferromagnet Sr$_2$CoSi$_2$O$_7$ studied using single-crystal neutron diffraction > print |
| Home > Publications database > Magnetic structure of the two-dimensional XY antiferromagnet Sr$_2$CoSi$_2$O$_7$ studied using single-crystal neutron diffraction > print |
| 001 | 1018017 | ||
| 005 | 20240319203611.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevB.107.014420 |2 doi |
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| 100 | 1 | _ | |a Dutta, Rajesh |0 0000-0002-6009-5158 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Magnetic structure of the two-dimensional XY antiferromagnet Sr$_2$CoSi$_2$O$_7$ studied using single-crystal neutron diffraction |
| 260 | _ | _ | |a Woodbury, NY |c 2023 |b Inst. |
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| 520 | _ | _ | |a 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 $T_N$. |
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