Magnon-spinon dichotomy in the Kitaev hyperhoneycomb 
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Ruiz, Alejandro; Breznay, Nicholas; Li, Mengqun; Rousochatzakis, Ioannis; Allen, Anthony; Zinda, Isaac; Nagarajan, Vikram; Lopez, Gilbert; Islam, Zahirul; Upton, M. H.; Kim, Jungho; Said, Ayman; Huang, Xiaolong; Gög, T.; Casa, D.; Birgeneau, R. J.; Koralek, Jake; Analytis, James; Perkins, Natalia B.; Frañó, Alex

doi:10.1103/physrevb.103.184404

Cited by 22 publications

(24 citation statements)

References 73 publications

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“…Our analysis of the 𝑇 dependence of this continuum and the evolution of its spectral weight, as well as a comparison with theoretical calculations, suggests that this continuum is not associated with the magnon excitations of the low-𝑇 ordered phase. Rather, the continuum is more consistent with spinons of the proximate Kitaev spin liquid phase, thus reinforcing the magnon-spinon dichotomy picture already advocated previously for this material by a resonant inelastic X-ray scattering (RIXS) study [22].…”

supporting

confidence: 83%

“…The majority of these systems order magnetically at sufficiently low temperatures [8,9], consistent with theoretical predictions that the Kitaev quantum spin liquid (QSL) phases, that are stabilized by the so-called Kitaev anisotropy 𝐾, are fragile against weak perturbations [3,[10][11][12]. However, the usual dominance of the Kitaev coupling renders these materials in relative proximaty to the ideal QSL phases, leading to a general expectation that the magnon modes expected at low energies will coexist with a broad continuum associated with the fractional excitations (spinons) of the nearby QSL phases [13][14][15][16][17][18][19][20][21][22].…”

supporting

confidence: 76%

“…Here we explore this picture in the hyperhoneycomb Kitaev material 𝛽-Li 2 IrO 3 with inelastic Raman scattering, which is known to be a sensitive probe to single-and multi-particle excitations over sufficiently wide ranges of temperature and energy [15,18,19,21]. The 𝛽-Li 2 IrO 3 compound features an Fddd orthorombic space group, with a hyperhoneycomb lattice of 𝐼𝑟 4+ ions, each forming an effective 𝐽 eff = 1/2 magnetic moment due to strong spin-orbit coupling (SOC) [22][23][24][25][26][27]. As shown in Fig.…”

mentioning

confidence: 99%

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Signatures of non-Loudon-Fleury Raman scattering in the Kitaev magnet $β$-Li$_2$IrO$_3$

Yang,

Wang,

Rousochatzakis

et al. 2022

Preprint

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We investigate the magnetic excitations of the hyperhoneycomb Kitaev magnet 𝛽-Li 2 IrO 3 by means of inelastic Raman scattering. The spectra exhibits a coexistence of a broad scattering continuum and two sharp low-energy peaks at 2.5 meV and 3 meV, with a distinctive polarization dependence. While the continuum is suggestive of fractional quasi-particles emerging from a proximate quantum spin liquid phase, the sharp peaks provide the first experimental signature of the 'non-Loudon-Fleury' one-magnon scattering processes proposed recently [Phys. Rev. B 104, 144412 (2021)]. The corresponding microscopic mechanism is similar to the one leading to the symmetric off-diagonal exchange interaction Γ (as it involves a combination of both direct and ligand-mediated exchange paths), but is otherwise completely unexpected within the traditional Loudon-Fleury theory of Raman scattering. The present experimental verification therefore calls for a drastic reevaluation of Raman scattering in similar systems with strong spin orbit coupling and multiple exchange paths.

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supporting

confidence: 83%

supporting

confidence: 76%

mentioning

confidence: 99%

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Signatures of non-Loudon-Fleury Raman scattering in the Kitaev magnet $β$-Li$_2$IrO$_3$

Yang,

Wang,

Rousochatzakis

et al. 2022

Preprint

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“…The energy of A, E A loss = 29 meV, is consistent with collective magnetic excitations observed in other iridates [51][52][53][54][55]. We find that the intensity of peak A follows detailed balance; but there is no correlation with the Curie-Weiss temperature (θ CW = −132 K) [19], ruling out a spin wave origin [20].…”

supporting

confidence: 83%

Nearly itinerant electronic groundstate in the intercalated honeycomb iridate Ag$_3$LiIr$_2$O$_6$

de la Torre,

Zager,

Bahrami

et al. 2021

Preprint

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We use x-ray spectroscopy at Ir L3/L2 absorption edge to study powder samples of the intercalated honeycomb magnet Ag3LiIr2O6. Based on x-ray absorption and resonant inelastic x-ray scattering measurements, and exact diagonalization calculations including next-neighbour Ir-Ir electron hoping integrals, we argue that the intercalation of Ag atoms results in a nearly itinerant electronic structure with enhanced Ir-O hybridization. As a result of the departure from the local relativistic j eff = 1/2 state, we find that the relative orbital contribution to the magnetic moment is increased, and the magnetization density is spatially extended and asymmetric. Our results confirm the importance of metal -ligand hybridazation in the magnetism of transition metal oxides and provide empirical guidance for understanding the collective magnetism in intercalated honeycomb iridates.

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“…Incommensurate long‐range order causes complex magnon spectra that were indeed observed in the energy range up to 12 meV in α ‐

{Li}_{2} {IrO}_{3}

[ 71 ] and up to 16 meV in β ‐

{Li}_{2} {IrO}_{3}

. [ 72 ] Despite the strong exchange anisotropy, magnon gaps in zero field are negligible. [ 67,71 ] In the case of β ‐polymorph, field‐induced phase transition opens a gap above

B_{normalc}

, similar to another Kitaev material α ‐

{RuCl}_{3}

where this gap opening has been studied extensively.…”

Section: Parent Compoundsmentioning

confidence: 99%

Kitaev Magnetism through the Prism of Lithium Iridate

Tsirlin

Gegenwart

2021

Physica Status Solidi (b)

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Fifteen years since its inception, the Kitaev model still boasts only a narrow group of material realizations. The progress in studying and understanding one of them, lithium iridate available in three polymorphs that host strong Kitaev interactions on spin lattices of different dimensionality and topology, is reviewed. Feasibility, effectiveness, and repercussions of tuning strategies based on the application of external pressure and chemical substitutions are also discussed.

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Magnon-spinon dichotomy in the Kitaev hyperhoneycomb β−Li2IrO3

Cited by 22 publications

References 73 publications

Signatures of non-Loudon-Fleury Raman scattering in the Kitaev magnet $β$-Li$_2$IrO$_3$

Signatures of non-Loudon-Fleury Raman scattering in the Kitaev magnet $β$-Li$_2$IrO$_3$

Nearly itinerant electronic groundstate in the intercalated honeycomb iridate Ag$_3$LiIr$_2$O$_6$

Kitaev Magnetism through the Prism of Lithium Iridate

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