This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.34734/FZJ-2023-04486 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.108.094412 in citations.
Magnetic structure of the magnetoelectric material Ba$_2$MnGe$_2$O$_7$
Magnetic structure of the magnetoelectric material Ba$_2$MnGe$_2$O$_7$
Detailed investigation of Ba$_2$MnGe$_2$O$_7$ was performed in its low-temperature magnetoelectric state combining neutron diffraction with magnetization measurements on single crystals. In the paramagnetic state at 10 K, polarized neutron diffraction was applied to reveal the components of the susc...
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Personal Name(s): | Sazonov, A. |
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Thoma, H. (Corresponding author) / Dutta, R. / Meven, Martin / Gukasov, A. / Fittipaldi, R. / Granata, V. / Masuda, T. / Náfrádi, B. / Hutanu, V. | |
Contributing Institute: |
JCNS-4; JCNS-4 Heinz Maier-Leibnitz Zentrum; MLZ JARA-FIT; JARA-FIT Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Physical review / B, 108 (2023) 9, S. 094412 |
Imprint: |
Woodbury, NY
Inst.
2023
|
DOI: |
10.34734/FZJ-2023-04486 |
DOI: |
10.1103/PhysRevB.108.094412 |
Document Type: |
Journal Article |
Research Program: |
Materials – Quantum, Complex and Functional Materials Jülich Centre for Neutron Research (JCNS) (FZJ) |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.108.094412 in citations.
Detailed investigation of Ba$_2$MnGe$_2$O$_7$ was performed in its low-temperature magnetoelectric state combining neutron diffraction with magnetization measurements on single crystals. In the paramagnetic state at 10 K, polarized neutron diffraction was applied to reveal the components of the susceptibility tensor. The crystal and magnetic structures below the antiferromagnetic transition temperature of $T_N$ ≈ 4K were determined using unpolarized neutron diffraction. This data implies no structural phase transition from 10K down to 2.5K and is well described within the tetragonal space group $P\overline{4}2_1m$. We found that in zero magnetic field the magnetic space group is either $C_cmc2_1$ or $P_c2_12_12_1$ with antiferromagnetic order along the [110] or [100] directions, respectively, while neighboring spins along the [001] axis are ordered antiferromagnetically. A non-collinear spin arrangement due to small canting within the ab plane is allowed by symmetry and observed experimentally. The ordered moment is found to be 3.24(3) μB/Mn$^{2+}$ at 2.5K and the temperaturefield dependent magnetic phase diagram is mapped out by macroscopic magnetization. Distinct differences between the magnetic structure of Ba$_2$MnGe$_2$O$_7$ as compared to those of Ba$_2$CoGe$_2$O$_7$ and Ca$_2$CoSi$_2$O$_7$ are discussed. |