Magnetic structures and quadratic magnetoelectric effect in LiNiPO4 beyond 30 T

Ellen Fogh*, Takumi Kihara, Rasmus Toft-Petersen, Maciej Bartkowiak, Yasuo Narumi, Oleksandr Prokhnenko, Atsushi Miyake, Masashi Tokunaga, Kenichi Oikawa, Michael Korning Sørensen, Julia Cathrine Dyrnum, Hans Grimmer, Hiroyuki Nojiri, Niels Bech Christensen

*Corresponding author for this work

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Neutron 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 QVI = (0, 1/3, 0) in the interval 37.6 - 39.4 T and QVII = (0, 0, 0) in the interval 39.4 - 54 T. A quadratic magnetoelectric effect is discovered in the QVII = (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.
Original languageEnglish
Article number024403
JournalPhysical Review B
Issue number2
Number of pages12
Publication statusPublished - 2020


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