Magnetic structures and quadratic magnetoelectric effect in LiNiPO${}_4$ beyond 30T

Abstract

Neutron diffraction with static and pulsed magnetic fields is used to directly probe the magnetic structures in LiNiPO${}_4$ 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 ${\mathbf{Q}}_{\mathrm{VI}}$ = (0, 1/3, 0) in the interval 37.6--39.4T and ${\mathbf{Q}}_{\mathrm{VII}}$ = (0, 0, 0) in the interval 39.4-54T. A quadratic magnetoelectric effect is discovered in the ${\mathbf{Q}}_{\mathrm{VII}}$ = (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.

References in corpus (11)

• Spin current and magneto-electric effect in non-collinear magnets
• Mantid - Data Analysis and Visualization Package for Neutron Scattering and $\mu SR$ Experiments
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Switching the Ferroelectric Polarization by External Magnetic Fields in the Spin = 1/2 Chain Cuprate LiCuVO4
• Field-induced magnetic phases and electric polarization in LiNiPO4
• Anomalous spin-waves and the commensurate-incommensurate magnetic phase transition in LiNiPO4
• Multiferroic properties of an åkermanite Sr${}_2$CoSi${}_2$O${}_7$ single crystal in high magnetic fields
• Dzyaloshinskii-Moriya interaction and the magnetic ground state in magnetoelectric LiCoPO${}_4$
• Magnetic order, hysteresis and phase coexistence in magnetoelectric LiCoPO${}_4$
• Spin excitations of magnetoelectric LiNiPO${}_4$ in multiple magnetic phases
• Magnetoelectric spectroscopy of spin excitations in LiCoPO4

Cited by in corpus (6)

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• Investigating field-induced magnetic order in Han Purple by neutron scattering up to 25.9 T
• Anti-symmetric Compton scattering in LiNiPO${}_4$: Towards a direct probe of the magneto-electric multipole moment
• Quadratic magnetoelectric effect during field cooling in sputter grown Cr${}_2$O${}_3$ films
• Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures