Journal article · Preprint article
Magnetic structures and quadratic magnetoelectric effect in LiNiPO4 beyond 30 T
Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark1
Paul Scherrer Institute2
Department of Physics, Technical University of Denmark3
Tohoku University4
Helmholtz Centre Berlin for Materials and Energy5
The University of Tokyo6
Japan Atomic Energy Agency7
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark8
Department of Energy Conversion and Storage, Technical University of Denmark9
Technical University of Denmark10
...and 0 moreNeutron diffraction with static and pulsed magnetic fields is used to directly probe the magnetic structures in LiNiPO4 up to 25 T and 42 T, respectively. By combining these results with magnetometry and electric polarization measurements under pulsed fields, the magnetic and magnetoelectric phases are investigated up to 56 T applied along the easy c axis.
In addition to the already known transitions at lower fields, three new ones are reported at 37.6, 39.4, and 54 T. Ordering vectors are identified with Q VI = (0, 1/3, 0) in the interval 37.6 - 39.4 T and Q VII = (0, 0, 0) in the interval 39.4 - 54 T. A quadratic magnetoelectric effect is discovered in the Q VII = (0, 0, 0) phase and the field dependence of the induced electric polarization is described using a simple mean-field model.
The observed magnetic structure and magnetoelectric tensor elements point to a change in the lattice symmetry in this phase. We speculate on the possible physical mechanism responsible for the magnetoelectric effect in LiNiPO4.
Language: | English |
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Year: | 2020 |
ISSN: | 1550235x , 10980121 , 24699969 and 24699950 |
Types: | Journal article and Preprint article |
DOI: | 10.1103/physrevb.101.024403 |
ORCIDs: | Fogh, Ellen , Toft-Petersen, Rasmus , Sørensen, Michael Korning , Christensen, Niels Bech , 0000-0003-1974-1493 , 0000-0003-4913-626X and 0000-0002-6435-6095 |