Successive magnetic field-induced transitions and colossal magnetoelectric effect in Ni${}_3$TeO${}_6$

Abstract

We report the discovery of a metamagnetic phase transition in a polar antiferromagnet Ni${}_3$TeO${}_6$ that occurs at 52 T. The new phase transition accompanies a colossal magnetoelectric effect, with a magnetic-field-induced polarization change of 0.3 $\mu$C/cm${}^2$, a value that is 4 times larger than for the spin-flop transition at 9 T in the same material, and also comparable to the largest magnetically-induced polarization changes observed to date. Via density-functional calculations we construct a full microscopic model that describes the data. We model the spin structures in all fields and clarify the physics behind the 52 T transition. The high-field transition involves a competition between multiple different exchange interactions which drives the polarization change through the exchange-striction mechanism. The resultant spin structure is rather counter-intuitive and complex, thus providing new insights on design principles for materials with strong magnetoelectric coupling.

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• Partially disordered antiferromagnetism and multiferroic behavior in a frustrated Ising system, CoCl${}_2$-2SC(NH${}_2$)${}_2$
• Giant X-ray circular dichroism in a time-reversal invariant altermagnet
• High-field magnetoelectric coupling and successive magnetic transitions in Mn-doped polar antiferromagnet Ni3TeO6
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• Spin-lattice and electron-phonon coupling in 3$d$/5$d$ hybrid Sr${}_3$NiIrO${}_6$
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• Spin Excitation in Coupled Honeycomb Lattice Ni${}_2$InSbO${}_6$
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• Chirality Transfer to the Magnetic Sublattice in the Hybrid Perovskite (R)-/(S)-3-Fluoropyrrolidinium Copper(II) Chloride
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