TY - JOUR
T1 - Magnetic structures and quadratic magnetoelectric effect in LiNiPO4 beyond 30 T
AU - Fogh, Ellen
AU - Kihara, Takumi
AU - Toft-Petersen, Rasmus
AU - Bartkowiak, Maciej
AU - Narumi, Yasuo
AU - Prokhnenko, Oleksandr
AU - Miyake, Atsushi
AU - Tokunaga, Masashi
AU - Oikawa, Kenichi
AU - Sørensen, Michael Korning
AU - Dyrnum, Julia Cathrine
AU - Grimmer, Hans
AU - Nojiri, Hiroyuki
AU - Christensen, Niels Bech
N1 - Funding Information:
This work was supported by the Danish Agency for Science and Higher Education under DANSCATT. Neutron experiments were performed at the BER II research reactor at the Helmholtz-Zentrum Berlin, Germany, and at the Materials and Life Science Experimental Facility at J-PARC, Japan (Proposal No. 2015A0122). We would like to extend our gratitude to the great team running the High Magnet Facility at the Helmholtz-Zentrum Berlin: Many thanks to S. Gerischer and R. Wahle for taking care of the cryostat and to S. Kempfer and P. Smeibidl for making sure the magnet was delivering its . Magnetization and electric polarization measurements were performed at the Institute for Solid State Physics, Japan. We are grateful to Y. Matsuda and H. Suto for assisting with the NOBORU experiment and we thank D. Vaknin from Ames Lab for providing crystals for all experiments. E.F., R.T.-P., and N.B.C. reminisce numerous enjoyable discussions with N. H. Andersen on topics in condensed-matter physics, including the lithium orthophosphates. H. Nojiri acknowledges support under KAKENHI 23224009, 16H01060, and 16H04005.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/1/7
Y1 - 2020/1/7
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.101.024403
DO - 10.1103/PhysRevB.101.024403
M3 - Article
AN - SCOPUS:85078421104
SN - 2469-9950
VL - 101
JO - Physical Review B
JF - Physical Review B
IS - 2
M1 - 024403
ER -