Journal article
Magnetic structure of the magnetoelectric material Ba2MnGe2O7
Physical review. B, v 108(9), 094412
07 Sep 2023
Abstract
A detailed investigation of Ba2MnGe2O7 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 TN approximate to 4 K were determined using unpolarized neutron diffraction. These data imply no structural phase transition from 10 K down to 2.5 K and are well described within the tetragonal space group P4 over bar 21m. We found that in zero magnetic field the magnetic space group is either Ccmc21 or Pc212121 with antiferromagnetic order along the [110] or [100] direction, respectively, while neighboring spins along the [001] axis are ordered antiferromagnetically. A noncollinear 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) mu B/Mn2+ at 2.5 K and the temperature-field dependent magnetic phase diagram is mapped out by macroscopic magnetization. Distinct differences between the magnetic structure of Ba2MnGe2O7 as compared to those of Ba2CoGe2O7 and Ca2CoSi2O7 are discussed.
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Details
- Title
- Magnetic structure of the magnetoelectric material Ba2MnGe2O7
- Creators
- A. Sazonov - European Spallation SourceH. Thoma - Heinz Maier-Leibnitz ZentrumR. Dutta - Heinz Maier-Leibnitz ZentrumM. Meven - RWTH Aachen UniversityA. Gukasov - Laboratoire Léon BrillouinR. Fittipaldi - University of SalernoV. Granata - University of SalernoT. Masuda - The University of TokyoB. Nafradi - École Polytechnique Fédérale de LausanneV. Hutanu - Heinz Maier-Leibnitz Zentrum
- Publication Details
- Physical review. B, v 108(9), 094412
- Publisher
- Amer Physical Soc
- Number of pages
- 8
- Grant note
- 05K13PA3 / German Federal Ministry of Education and Research (BMBF); Federal Ministry of Education & Research (BMBF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:001075130700003
- Scopus ID
- 2-s2.0-85172663539
- Other Identifier
- 991022004636304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Industry collaboration
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter