Ni<sub>3</sub>TeO<sub>6</sub>—a collinear antiferromagnet with ferromagnetic honeycomb planes

Živković, Ivica; Prša, Krunoslav; Zaharko, O.; Berger, H.

doi:10.1088/0953-8984/22/5/056002

Cited by 62 publications

(86 citation statements)

References 14 publications

(23 reference statements)

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“…Ni ions have the outer shell electronic configuration t 6 2g e 2 g and spin S = 1, whereas Te is non-magnetic. 1,4 This system thus provides an opportunity to examine (i) magnetoelectric and magnetoelastic coupling when magnetic order develops in a polar lattice and (ii) how transition metal centers mix with non-magnetic ions that have large spin-orbit coupling. The complex magnetism also provides a framework that motivates the search for new high field phases.…”

Section: Introductionmentioning

confidence: 99%

“…The complex magnetism also provides a framework that motivates the search for new high field phases. Antiferromagnetic ordering sets in at T N = 53 K, with Ni spins along the hexagonal c-axis having ↑↑↓↓↓↑ ordering in the doubled rhombohedral unit cell (AFM-I) 4 . At the magnetic field of 9 T, applied along the hexagonal c-axis, the spins flop into the ab-plane (AFM-II phase).…”

Section: Introductionmentioning

confidence: 99%

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Tracking the continuous spin-flop transition inNi3TeO6by infrared spectroscopy

et al. 2015

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Easy axis antiferromagnets usually exhibit a first order spin-flop transition when the magnetic field is applied along the easy axis. Recently a colossal magnetoelectric effect was discovered in Ni3TeO6, suggesting a continuous spin-flop transition across a narrow phase in this material [Y. S. Oh, et al., Nature Comm. 5, 3201 (2014)]. Additional evidence is, however, desirable to verify this mechanism. Here we measure the infrared vibrational properties of Ni3TeO6 in high magnetic fields and demonstrate that the phonon anomalies are consistent with a second-order mechanism.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tracking the continuous spin-flop transition inNi3TeO6by infrared spectroscopy

et al. 2015

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“…In zero magnetic field (H), below the Neél temperature T N ¼ 52 K, NTO has a collinear -(e) Schematic spin structure along a c-axis chain at different magnetic fields applied along the c axis. The spins in the buckled honeycomb planes are aligned ferromagnetically in zero magnetic field [13]. J i stands for the five nearestneighbor exchange constants considered in the text.…”

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confidence: 99%

“…antiferromagnetic (AFM) order, ↑↑↑↓↓↓ in the rhombohedral unit cell with spins aligned along the c axis [13]. The spatial inversion symmetry is broken and the electric polarization points along the c axis, as in Ca 3 ðCo; MnÞO 6 [10,14].…”

mentioning

confidence: 99%

“…The ME coefficient (α ≡ dP=dH) is as high as 1300 ps=m at H c1 , without any magnetic hysteresis. However, a phenomenological model with only two magnetic sublattices was implemented to describe the polarization change at the SF transition [15], whereas a full description of NTO requires a model with six different magnetic sublattices and several competing exchange interactions between them [13].…”

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confidence: 99%

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Successive Magnetic-Field-Induced Transitions and Colossal Magnetoelectric Effect inNi3TeO6

et al. 2015

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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 magneticfield-induced polarization change of 0.3 μC=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 counterintuitive and complex, thus providing new insights on design principles for materials with strong magnetoelectric coupling. Magnetoelectric (ME) multiferroics have been extensively studied recently to understand the mechanisms responsible for cross-coupling between magnetism and ferroelectricity, which is at the heart of their promise for applications in multifunctional devices [1][2][3][4][5][6]. In this class of materials, at least three mechanisms are known to induce ferroelectric polarization (P) upon magnetic order: (1) the spin current or inverse Dzyaloshinskii-Moriya (DM) interaction in a spin-cycloidal structure which is mediated by antisymmetric exchange [7][8][9], (2) the symmetric exchange-striction mechanism in collinear magnets [10], and (3) the hybridization between metal d and ligand p orbitals that is modulated by spin direction [11]. A majority of ME couplings that have been studied to date involve mechanisms (1) and (3). However, the symmetric exchange mechanism (2) can, in principle, also lead to large ME effects.Another route to a large ME effect is to consider magnetic systems that have a polar structure. This condition meets the prerequisites for the ME effect; i.e., the coexistence of broken spatial-inversion symmetry and timereversal symmetry. Often, these systems exhibit a nonpolar to polar structural transition at high temperatures and magnetic ordering at lower temperatures. A well-known example is BiFeO 3 , with ferroelectric and antiferromagnetic transition temperatures at 1100 K and 653 K, respectively [12]. However, its ME effect is small compared to those of spin-driven ME materials.Recently, a ME effect has been observed in the corundum-related compound Ni 3 TeO 6 (NTO). It crystallizes in a polar R3 space group with three Ni 2þ ions (3d 8 , S ¼ 1) and a nonmagnetic Te ion arranged along the c axis in a unit cell [ Fig. 1(a)] to form a linear chain with broken spatialinversion symmetry. This material is not ferroelectric but pyroelectric; i.e., the electric polarization cannot be switched by an external electric field. However, in addition to its nonswitchable electric polarization component due to the polar structure, it also shows a...

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Giant X‐Ray Circular Dichroism in a Time‐Reversal Invariant Antiferromagnet

Okamoto,

Wang,

Chu

et al. 2024

Advanced Materials

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X‐ray circular dichroism, arising from the contrast in X‐ray absorption between opposite photon helicities, serves as a spectroscopic tool to measure the magnetization of ferromagnetic materials and identify the handedness of chiral crystals. Antiferromagnets with crystallographic chirality typically lack X‐ray magnetic circular dichroism because of time‐reversal symmetry, yet exhibit weak X‐ray natural circular dichroism. Here, we report the observation of giant natural circular dichroism in the Ni L3‐edge X‐ray absorption of Ni3TeO6, a polar and chiral antiferromagnet with effective time‐reversal symmetry. To unravel this intriguing phenomenon, we propose a phenomenological model that classifies the movement of photons in a chiral crystal within the same symmetry class as that of a magnetic field. The coupling of X‐ray polarization with the induced magnetization yields giant X‐ray natural circular dichroism, revealing typical ferromagnetic behaviors allowed by the symmetry in an antiferromagnet, i.e., the altermagnetism of Ni3TeO6. Our findings provide evidence for the interplay between magnetism and crystal chirality in natural optical activity. Additionally, we establish the first example of a new class of magnetic materials exhibiting circular dichroism with time‐reversal symmetry.This article is protected by copyright. All rights reserved

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Ni₃TeO₆—a collinear antiferromagnet with ferromagnetic honeycomb planes

Cited by 62 publications

References 14 publications

Tracking the continuous spin-flop transition inNi3TeO6by infrared spectroscopy

Tracking the continuous spin-flop transition inNi3TeO6by infrared spectroscopy

Successive Magnetic-Field-Induced Transitions and Colossal Magnetoelectric Effect inNi3TeO6

Giant X‐Ray Circular Dichroism in a Time‐Reversal Invariant Antiferromagnet

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Ni3TeO6—a collinear antiferromagnet with ferromagnetic honeycomb planes

Cited by 62 publications

References 14 publications

Tracking the continuous spin-flop transition inNi3TeO6by infrared spectroscopy

Tracking the continuous spin-flop transition inNi3TeO6by infrared spectroscopy

Successive Magnetic-Field-Induced Transitions and Colossal Magnetoelectric Effect inNi3TeO6

Giant X‐Ray Circular Dichroism in a Time‐Reversal Invariant Antiferromagnet

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Ni₃TeO₆—a collinear antiferromagnet with ferromagnetic honeycomb planes