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

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Neutron diffraction with static and pulsed magnetic fields is used to directly probe the magnetic structures in LiNiPO4 up to 25T and 42T, respectively. By combining these results with magnetometry and electric polarization measurements under pulsed fields, the magnetic and magnetoelectric phases are investigated up to 56T 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 54T. Ordering vectors are identified with QVI=(0,13,0) in the interval 37.6-39.4T and QVII=(0,0,0) in the interval 39.4-54T. 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
Publication statusPublished - 2020 Jan 7


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