NiO as a test case for high resolution resonant inelastic soft x-ray scattering

Ghiringhelli, G.; Matsubara, Masahiko; Dallera, C.; Fracassi, Francesca Luciana; Gusmeroli, R.; Piazzalunga, A.; Tagliaferri, Alberto; Brookes, N. B.; Kotani, Akio; Braicovich, L.

doi:10.1088/0953-8984/17/35/007

Cited by 78 publications

(111 citation statements)

References 42 publications

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“…The principle electronic excitations observed in Xray absorption spectroscopy (XAS) and RIXS with p-symmetry core holes on Co [7,16], Ni [6,8,14,15,17,18,36], and Cu [8,9] are closely identified with excitation matrix elements obtained from AM based calculations for a high-spin 2+ valence atomic state perturbed by the crystal field of surrounding oxygen atoms. The compounds CoO and NiO have a rock salt crystal structure, with an octahedral crystal field on the transition metal site, and strong antiferromagnetic superexchange interactions through σ -bonded oxygen atoms.…”

Section: Methodsmentioning

confidence: 82%

“…Previous experimental studies performed with soft X-rays at the transition metal L-edge (700-900 eV) have noted that charge transfer features from these materials have significant intensity at 4-7 eV energy loss [14,[16][17][18]. M-edge studies have noted that charge transfer excitations are weak, but stopped short of presenting data that covered the Mott gap feature [15,16].…”

Section: Looking For Charge Transfer Excitations Outside the Am Windowmentioning

confidence: 99%

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Extending resonant inelastic X-ray scattering to the extreme ultraviolet

et al. 2015

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In resonant inelastic X-ray scattering (RIXS), core hole resonance modes are used to enhance coupling between photons and low energy electronic degrees of freedom. Resonating with shallow core holes accessed in the extreme ultraviolet (EUV) can provide greatly improved energy resolution at standard resolving power, but has been found to often yield qualitatively different spectra than similar measurements performed with higher energy X-rays. This paper uses experimental data and multiplet-based numerical simulations for the M-edges of Co-, Ni-, and Cu-based Mott insulators to review the properties that distinguish EUV RIXS from more commonly performed higher energy measurements. Key factors such as the origin of the strong EUV elastic line and advantages of EUV spectral functions over soft X-ray RIXS for identifying intrinsic excitation line shapes are discussed.

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Section: Methodsmentioning

confidence: 82%

Section: Looking For Charge Transfer Excitations Outside the Am Windowmentioning

confidence: 99%

Extending resonant inelastic X-ray scattering to the extreme ultraviolet

et al. 2015

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“…44,60 In the first step, a V 2p 3/2 core electron is excited by a photon with E in to the open 3d shell. In the second step, an electron relaxes to the 2p shell, leaving the system either in .…”

Section: Resultsmentioning

confidence: 99%

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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“…[31][32][33] Also quite recently, d-d excitations in NiO, which is a prototypical Mott insulator with a large charge transfer gap of about 4 eV, has been observed in INS using a spallation neutron source that can provide high-energy neutrons. 34) The results obtained by INS were compared with those of the experiments by RIXS with soft x-rays 35,36) and hard x-rays, 37) and NIXS, 38) which were performed to detect d-d excitations in NiO. Such a comparison shed light on understanding excitations in the same energy range observed with probes that rely on different spectroscopic mechanisms.…”

Section: Complementary Aspect To Neutron Scatteringmentioning

confidence: 99%

Inelastic X-ray Scattering Studies of Electronic Excitations

2013

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Inelastic x-ray scattering (IXS) has developed into one of the most powerful momentum-resolved spectroscopies. Especially in the last decade, it has achieved significant progress utilizing brilliant x-rays from third-generation synchrotron radiation facilities. Simultaneously, theoretical efforts have been made to predict or interpret the experimental spectra. One of the scientific fields studied intensively by IXS is strongly correlated electron systems, where the interplay of charge, spin, and orbital degrees of freedom determines their physical properties. IXS can provide a new insight into the electron dynamics of the systems through the observation of charge, spin, and orbital excitations. Focusing on the momentum-resolved electronic excitations in strongly correlated electron systems, we review IXS studies and the present capabilities of IXS for the study of the dynamics of materials. With nonresonant inelastic x-ray scattering (NIXS), one can directly obtain dynamical charge correlation and we discuss its complementary aspects with inelastic neutron scattering. NIXS also has a unique capability of measuring higher multipole transitions, which are usually forbidden in conventional optical absorption. Resonant inelastic x-ray scattering (RIXS) is now established as a valuable tool for measuring charge, spin, and orbital excitations in a momentum-resolved manner. We describe RIXS works on cuprates in detail and show what kind of electronic excitations have been observed. We also discuss RIXS studies on other transition-metal compounds. Finally, we conclude with an outlook on IXS using next-generation x-ray sources.

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NiO as a test case for high resolution resonant inelastic soft x-ray scattering

Cited by 78 publications

References 42 publications

Extending resonant inelastic X-ray scattering to the extreme ultraviolet

Extending resonant inelastic X-ray scattering to the extreme ultraviolet

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

Inelastic X-ray Scattering Studies of Electronic Excitations

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