Strong antiferromagnetic interaction owing to a large trigonal distortion in the spin-orbit-coupled honeycomb lattice iridate 
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Haraguchi, Yuya; Katori, Hiroko Aruga

doi:10.1103/physrevmaterials.4.044401

Cited by 23 publications

(32 citation statements)

References 29 publications

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“…3b), oxygen vacancies ( Supplementary Fig. 4) and possible inter-diffusion can be the source of local structural distortions that destroy Kitaev-type interactions via the non-ideal splitting of Ir 5d orbitals 20 . Nevertheless, the suppression of the strong antiferromagnetic order in the Mn sublattice is promising for demonstrating the feasibility of controlling spin interactions by artificially engineered ilmenite-type oxides.…”

Section: Resultsmentioning

confidence: 99%

“…This is because their volatile and/or diffusible nature requires the precise control of stoichiometry and the suppression of inter-diffusion to reproduce the bulk properties. Inspired by these problems in known Kitaev candidate materials, we aim to determine a new crystal system that is suitable for thin-film research and focus on ilmenite-type ABO 3 compounds (where A and B are metal cations) containing Ir 19,20 . Recently, Haraguchi et al proposed a method for the bulk synthesis of ilmenite-type ZnIrO 3 and MgIrO 3 with honeycomb lattices of edge-sharing IrO 6 octahedra in the ab plane 19 (e.g., see Fig.…”

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confidence: 99%

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Stabilization of a honeycomb lattice of IrO6 octahedra by formation of ilmenite-type superlattices in MnTiO3

Miura¹,

Fujiwara

Nakayama

et al. 2020

Commun Mater

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In quantum spin liquid research, thin films are an attractive arena that enables the control of magnetic interactions via epitaxial strain and two-dimensionality, which are absent in bulk crystals. Here, as a promising candidate for the development of quantum spin liquids in thin films, we propose a robust ilmenite-type oxide with a honeycomb lattice of edge-sharing IrO 6 octahedra artificially stabilised by superlattice formation using the ilmenite-type antiferromagnetic oxide MnTiO 3. Stabilised sub-unit-cell-thick Mn-Ir-O layers are isostructural to MnTiO 3 and have an atomic arrangement corresponding to ilmenite-type MnIrO 3. By performing spin Hall magnetoresistance measurements, we observe that antiferromagnetic ordering in the ilmenite Mn sublattice is suppressed by modified magnetic interactions in the MnO 6 planes via the IrO 6 planes. These findings contribute to the development of twodimensional Kitaev candidate materials, accelerating the discovery of exotic physics and applications specific to quantum spin liquids.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Stabilization of a honeycomb lattice of IrO6 octahedra by formation of ilmenite-type superlattices in MnTiO3

Miura¹,

Fujiwara

Nakayama

et al. 2020

Commun Mater

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“…Note that van der Waals heterostructures of atomically thin α-RuCl 3 and graphene have been fabricated [36][37][38][39], which would be extended to the current situation. Besides, a superstructure of an ilmenite MnTiO 3 including IrO 6 honeycomb layers [40,41] could be such a platform, where the antiferromagnetic moment in MnTiO 3 can be regarded as a staggered internal magnetic field acting on the possible Kitaev spin liquid in the IrO 6 honeycomb layers [42][43][44]. In such situations, however, the magnon excitations in the antiferromagnet can contribute to the thermal transport.…”

Section: Contributions From Magnonsmentioning

confidence: 99%

Asymmetric modulation of Majorana excitation spectra and nonreciprocal thermal transport in the Kitaev spin liquid under a staggered magnetic field

Nakazawa,

Kato,

Motome

2022

Preprint

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We present the theoretical results for the Majorana band structure and thermal transport properties in the Kitaev honeycomb model under a staggered magnetic field in addition to a uniform one. The Majorana band structure is asymmetrically modulated in momentum space, and the valley degree of freedom is activated and controlled by the magnitudes and directions of the uniform and staggered magnetic fields; as a result, the Majorana excitation is either gapped or gapless, the latter of which in general has Majorana Fermi surfaces, in contrast to the point nodes in the absence of the fields. We show that the asymmetric deformation of the Majorana band induces a nonlinear (nonreciprocal) thermal transport, in addition to the linear one. The field dependence of the linear thermal current is correlated with the magnitude of the Majorana gap, while that of the nonlinear thermal current is associated with the asymmetry of the Majorana excitation spectra. We show the estimates of the thermal currents and discuss that the linear response is experimentally measurable, whereas future improvement is required for the observation of the nonlinear one. We also discuss how the thermal currents are modulated by other additional effects of the magnetic field and contributions from conventional magnons, latter of which are expected in heterostructures to realize an internal staggered magnetic field.

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“…Since the iridium ilmenites have a similar honeycomb network, they potentially serve as another candidates for the Kitaev spin liquid. Powder samples of these compounds, however, were shown to exhibit magnetic phase transitions at 31.8 K for MgIrO 3 , 46.6 K for ZnIrO 3 [19], and 90.9 K in CdIrO 3 [20], which are higher than ∼ 15 K for AIrO 3 [22,23,[37][38][39]. The susceptibility measurements for the A = Mg and Zn indicate that they have in-plane magnetic anisotropy, while Na 2 IrO 3 and Li 2 IrO 3 show the out-of-plane and in-plane anisotropy, respectively [22,28].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a new series of ilmenite with B=Ir has been synthesized as MgIrO 3 , ZnIrO 3 , and CdIrO 3 [19,20]. These compounds are of particular interest from a different perspective than ATiO 3 : they have a honeycomb network of edge-sharing IrO 6 octahedra similar to monoclinic A 2 IrO 3 with A = Na and Li which have been intensively studied as candidates for realizing a quantum spin liquid in the honeycomb Kitaev model [21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Electronic and magnetic properties of iridium ilmenites $A$IrO$_3$ ($A=$ Mg, Zn, and Mn)

Jang,

Motome

2021

Preprint

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We theoretically investigate the electronic band structures and magnetic properties of ilmenites with edge-sharing IrO6 honeycomb layers, AIrO3 with A = Mg, Zn, and Mn, in comparison with a collinear antiferromagnet MnTiO3. The compounds with A = Mg and Zn were recently reported in Y. Haraguchi et al., Phys. Rev. Materials 2, 054411 (2018), while MnIrO3 has not been synthesized yet but the honeycomb stacking structure was elaborated in a superlattice with MnTiO3 in K. Miura et al., Commun. Mater. 1, 55 (2020). We find that, in contrast to MnTiO3, where an energy gap opens in the Ti 3d bands by antiferromagnetic ordering of the high-spin S = 5/2 moments, MgIrO3 and ZnIrO3 have a gap in the Ir 5d bands under the influence of both spin-orbit coupling and electron correlation. Their electronic structures are similar to those in the spin-orbit coupled Mott insulators with the j eff = 1/2 pseudospin degree of freedom, as found in monoclinic A2IrO3 with A = Na and Li which have been studied as candidates for the Kitaev spin liquid. Indeed, we find that the effective exchange interactions between the j eff = 1/2 pseudospins are dominated by the Kitaev-type bond-dependent interaction and the symmetric off-diagonal interactions. On the other hand, for MnIrO3, we show that the local lattice structure is largely deformed, and both Mn 3d and Ir 5d bands appear near the Fermi level in a complicated manner, which makes the electronic and magnetic properties qualitatively different from MgIrO3 and ZnIrO3. Our results indicate that the IrO6 honeycomb network in the ilmenites AIrO3 with A = Mg and Zn would offer a good platform for exotic magnetism by the spin-orbital entangled moments like the Kitaev spin liquid.

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Strong antiferromagnetic interaction owing to a large trigonal distortion in the spin-orbit-coupled honeycomb lattice iridate CdIrO3

Cited by 23 publications

References 29 publications

Stabilization of a honeycomb lattice of IrO6 octahedra by formation of ilmenite-type superlattices in MnTiO3

Stabilization of a honeycomb lattice of IrO6 octahedra by formation of ilmenite-type superlattices in MnTiO3

Asymmetric modulation of Majorana excitation spectra and nonreciprocal thermal transport in the Kitaev spin liquid under a staggered magnetic field

Electronic and magnetic properties of iridium ilmenites $A$IrO$_3$ ($A=$ Mg, Zn, and Mn)

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