Bimagnon studies in cuprates with resonant inelastic x-ray scattering at the O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>edge. I. Assessment on La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>CuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>and comparison with the excita

Bisogni, Valentina; Simonelli, Laura; Ament, L. J. P.; Forte, Filomena; Sala, M. Moretti; Minola, M.; Huotari, Simo; Brink, Jeroen van den; Ghiringhelli, G.; Brookes, N. B.; Braicovich, L.

doi:10.1103/physrevb.85.214527

Cited by 61 publications

(82 citation statements)

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“…This feature can be attributed to bimagnons, because (1) their energy scales are consistent with the bimagnons (160 meV for Sr 2 IrO 4 and 185 meV for Sr 3 Ir 2 O 7 ) measured by Raman scattering [47] and (2) their dispersions are in agreement with those measured by Ir L 3 RIXS [16][17][18]. Note that the bimagnons of cuprates measured by O K RIXS are nondispersive [35,36]. The presence of both single magnons and bimagnons indicates that O K RIXS is a powerful spectroscopic method for studying the magnetic dynamics of iridates.…”

supporting

confidence: 72%

“…Therefore, soft x-ray RIXS is a promising method for studying artificial two-dimensional samples [7,8]. However, given that SOC is absent in the O 1s level, O K RIXS is expected to be insensitive to single spin-flip excitations [31,35,36]. This would severely limit the applicability of O K RIXS on iridates and related 5d TM oxides, especially thin films and heterostructures fabricated by these materials, where magnetic excitations need to be studied for probing the low-energy Hamiltonian [15][16][17][18].…”

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confidence: 99%

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Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering

Olalde-Velasco

Huang

et al. 2018

Phys. Rev. B

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Resonant inelastic x-ray scattering (RIXS) experiments performed at the oxygen K edge on the iridate perovskites Sr 2 IrO 4 and Sr 3 Ir 2 O 7 reveal a sequence of well-defined dispersive modes over the energy range up to ∼0.8 eV. The momentum dependence of these modes and their variation with the experimental geometry allows us to assign each of them to specific collective magnetic and/or electronic excitation processes, including single and bimagnons, and spin-orbit and electron-hole excitons. We thus demonstrate that dispersive magnetic and electronic excitations are observable at the O K edge in the presence of the strong spin-orbit coupling in the 5d shell of iridium and strong hybridization between Ir 5d and O 2p orbitals, which confirm and expand theoretical expectations. More generally, our results establish the utility of O K-edge RIXS for studying the collective excitations in a range of 5d materials that are attracting increasing attention due to their novel magnetic and electronic properties. Especially, the strong RIXS response at O K edge opens up the opportunity for investigating collective excitations in thin films and heterostructures fabricated from these materials. DOI: 10.1103/PhysRevB.97.041102 Characterizing the elementary excitations in correlated electron systems is an essential prerequisite for obtaining a complete understanding of the underlying electronic interactions and therefore crucial for revealing the origin of emergent phases [1,2]. Resonant inelastic x-ray scattering (RIXS) has become established in the past decade as a powerful tool for studying the momentum dependence of electronic and magnetic excitations [2]

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supporting

confidence: 72%

mentioning

confidence: 99%

Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering

Olalde-Velasco

Huang

et al. 2018

Phys. Rev. B

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“…76,78,79 Similar to our case, the two-magnon feature in the cuprates can be revealed by comparison of RIXS at the Cu L 3 edge and the O K edge. 78,79 In the optical data, a peak at 0. • (middle) and 130…”

Section: Two-orbiton Peak At the O K Edgementioning

confidence: 57%

“…It is known to be sensitive to both orbital (or d-d) excitations and to intersite charge-transfer excitations. 40,44,[75][76][77][78][79][80] To the best of our knowledge, this is the first report on the observation of Mott-Hubbard excitations in RIXS at the O K edge. The differences between the RIXS data from the O K edge and from the V L 3 edge originate from the different microscopic excitation processes.…”

Section: Two-orbiton Peak At the O K Edgementioning

confidence: 92%

Orbital superexchange and crystal field simultaneously at play in YVO3: Resonant inelastic x-ray scattering at the VLedge and the OKedge

et al. 2013

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Orbital superexchange and crystal field simultaneously at play in YVO3Benckiser, E.; Fels, L.; Ghiringhelli, G.; Sala, M. Moretti; Schmitt, T.; Schlappa, J.; Strocov, V. N.; Mufti, N.; Blake, G. R.; Nugroho, A. A. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. We report on the observation of orbital excitations in YVO 3 by means of resonant inelastic x-ray scattering (RIXS) at energies across the vanadium L 3 and oxygen K absorption edges. At the V L 3 edge, we are able to resolve the full spectrum of orbital excitations up to 5 eV. In order to unravel the effect of superexchange interactions and the crystal field on the orbital excitations, we analyzed the energy and temperature dependence of the intra-t 2g excitations at 0.1-0.2 eV in detail. While these results suggest a dominant influence of the crystal field, peak shifts of about 13-20 meV observed as a function of the transferred momentum q a reflect a finite dispersion of the orbital excitations. This is puzzling since theoretical models based on superexchange interactions predict a dispersion only for q c. Furthermore, we demonstrate that RIXS at the O K edge is very sensitive to intersite excitations. At the O K edge, we observe excitations across the Mott-Hubbard gap and an additional feature at 0.4 eV, which we attribute to two-orbiton scattering, i.e., an exchange of orbitals between adjacent sites. Altogether, our results indicate that both superexchange interactions and the crystal field are important for a quantitative understanding of the orbital excitations in YVO 3 .

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“…The fast collision approximation [28][29][30] and the effective operator approach [31] suggested that only single magnon excitations or Sðq; ωÞ should be measured by RIXS at the Cu L edge [27,31,32]. More sophisticated treatments-the ultrashort core-hole lifetime (UCL) expansion [33][34][35] and the UCL-inspired ansatz [36]-highlighted that RIXS should also be sensitive to bimagnon excitations. A further extension of UCL also pointed out the importance of three-magnon excitations [37].…”

Section: When ∼10mentioning

confidence: 99%

Using RIXS to Uncover Elementary Charge and Spin Excitations

et al. 2016

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Despite significant progress in resonant inelastic x-ray scattering (RIXS) experiments on cuprates at the Cu L-edge, a theoretical understanding of the cross section remains incomplete in terms of elementary excitations and the connection to both charge and spin structure factors. Here, we use state-of-the-art, unbiased numerical calculations to study the low-energy excitations probed by RIXS in the Hubbard model, relevant to the cuprates. The results highlight the importance of scattering geometry, in particular, both the incident and scattered x-ray photon polarization, and they demonstrate that on a qualitative level the RIXS spectral shape in the cross-polarized channel approximates that of the spin dynamical structure factor. However, in the parallel-polarized channel, the complexity of the RIXS process beyond a simple two-particle response complicates the analysis and demonstrates that approximations and expansions that attempt to relate RIXS to less complex correlation functions cannot reproduce the full diversity of RIXS spectral features.

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Bimagnon studies in cuprates with resonant inelastic x-ray scattering at the OKedge. I. Assessment on La2CuO4and comparison with the excita

Cited by 61 publications

References 43 publications

Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering

Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering

Orbital superexchange and crystal field simultaneously at play in YVO3: Resonant inelastic x-ray scattering at the VLedge and the OKedge

Using RIXS to Uncover Elementary Charge and Spin Excitations

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