Charge transfer instability in a mixed Ir/Rh honeycomb lattice in Li2Ir1−xRhxO3 solid solution

Kumari, L. Sandhya; Wallace, M. K.; Barnes, Justin; Tong, B.; Ramirez, A. P.; Subramanian, M. A.

doi:10.1016/j.solidstatesciences.2016.10.001

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…Disorder among Li-M sites is commonly reported for honeycomb layered metal oxides since all corresponding crystallographic sites are octahedral and similar in size 4,9,11,17,18,26–28 . The presence of stacking faults associated with a shift between successive LiM 2 layers will cause the peaks in the region from 19° to 33° to further broaden asymmetrically 7–9,18,30 . Thus, with the existence of Li-M site disorder and stacking faults, it is difficult to distinguish between the corresponding space groups using powder X-ray diffraction.…”

Section: Resultsmentioning

confidence: 97%

“…Whereas magnetic honeycomb-containing compounds have been extensively investigated in 3d and 4d metal oxides 3–11 , the strong interaction anisotropy required by Kitaev’s theory has placed a focus on 5d metal oxides, for which strong spin-orbit coupling (SOC), the origin of spatial anisotropy, can be expected 12–18 . In the A 2 MO 3 honeycomb structure, where A is an alkali element and M a 4d or 5d element, the AM 2 layers form a hexagonal network of edge sharing MO 6 octahedra with a single A + ion at the centers of the hexagons (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Local Moment Instability of Os in Honeycomb Li2.15Os0.85O3

Wallace

LaBarre

et al. 2018

Sci Rep

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Compounds with honeycomb structures occupied by strong spin orbit coupled (SOC) moments are considered to be candidate Kitaev quantum spin liquids. Here we present the first example of Os on a honeycomb structure, Li2.15(3)Os0.85(3)O3 (C2/c, a = 5.09 Å, b = 8.81 Å, c = 9.83 Å, β = 99.3°). Neutron diffraction shows large site disorder in the honeycomb layer and X-ray absorption spectroscopy indicates a valence state of Os (4.7 ± 0.2), consistent with the nominal concentration. We observe a transport band gap of Δ = 243 ± 23 meV, a large van Vleck susceptibility, and an effective moment of 0.85 μB, much lower than expected from 70% Os(+5). No evidence of long range order is found above 0.10 K but a spin glass-like peak in ac-susceptibility is observed at 0.5 K. The specific heat displays an impurity spin contribution in addition to a power law ∝T(0.63±0.06). Applied density functional theory (DFT) leads to a reduced moment, suggesting incipient itineracy of the valence electrons, and finding evidence that Li over stoichiometry leads to Os(4+)−Os(5+) mixed valence. This local picture is discussed in light of the site disorder and a possible underlying quantum spin liquid state.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Local Moment Instability of Os in Honeycomb Li2.15Os0.85O3

Wallace

LaBarre

et al. 2018

Sci Rep

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“…The isoelectronic doping of α-Li 2 IrO 3 with rhodium gives rise to a similar dilution effect, because non-magnetic Rh 3+ is formed, triggering the oxidation of iridium toward Ir 5+ , which is also non-magnetic. 127 Ru 4+ doping is also possible and introduces holes into the system, but all doped samples remain robust insulators. 128 Similar to the Ti-doped case, glassy behavior is observed at low temperatures.…”

Section: Methodsmentioning

confidence: 99%

“…Non-magnetic dilution via Ti 4+ doping [122,123] leads to the percolation thresholds of 50% in α-Li 2 IrO 3 and only 30% in Na 2 IrO 3 . The isoelectronic doping of α-Li 2 IrO 3 with rhodium gives rise to a similar dilution effect, because non-magnetic Rh 3+ is formed, triggering the oxidation of iridium toward Ir 5+ , which is also non-magnetic [124].…”

Section: Doping Experimentsmentioning

confidence: 99%

Models and materials for generalized Kitaev magnetism

Winter

Tsirlin

Daghofer

et al. 2017

J. Phys.: Condens. Matter

550

522

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The exactly solvable Kitaev model on the honeycomb lattice has recently received enormous attention linked to the hope of achieving novel spin-liquid states with fractionalized Majorana-like excitations.In this review, we analyze the mechanism proposed by G. Jackeli and G. Khaliullin to identify Kitaev materials based on spin-orbital dependent bond interactions and provide a comprehensive overview of its implications in real materials. We set the focus on experimental results and current theoretical understanding of planar honeycomb systems (Na2IrO3, α-Li2IrO3, and α-RuCl3), three-dimensional Kitaev materials (β-and γ-Li2IrO3), and other potential candidates, completing the review with the list of open questions awaiting new insights.

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Honeycomb Li2Ru1-Rh O3 solid solution: Structure and electronic properties

Pathirana

LaBarre

et al. 2020

Journal of Solid State Chemistry

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Charge transfer instability in a mixed Ir/Rh honeycomb lattice in Li2Ir1−xRhxO3 solid solution

Cited by 4 publications

References 27 publications

Local Moment Instability of Os in Honeycomb Li2.15Os0.85O3

Local Moment Instability of Os in Honeycomb Li2.15Os0.85O3

Models and materials for generalized Kitaev magnetism

Honeycomb Li2Ru1-Rh O3 solid solution: Structure and electronic properties

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