Anisotropic exchange and spin-wave damping in pure and electron-doped 
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Pincini, D.; Vale, J. G.; Donnerer, C.; Torre, A. de la; Hunter, Emily C.; Perry, Robin; Sala, M. Moretti; Baumberger, F.; McMorrow, D. F.

doi:10.1103/physrevb.96.075162

Cited by 36 publications

(62 citation statements)

References 31 publications

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“…The large magnon gap (∼90 meV) in Sr 3 Ir 2 O 7 was explained to be driven by the strong magnetic anisotropy associated with SOC [17,18]. The smaller magnon gap in Sr 2 IrO 4 (∼40 meV) is consistent with an Ir L 3 RIXS report [16] and was described by including an XY anisotropic term [45,46] into the Heisenberg model described in Ref. [15].…”

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confidence: 59%

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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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“…The black curve in (a) is a theoretical fit of the magnon dispersion using a Heisenberg model reported in Refs. [45,46]. The black and red curves in (b) are transverse and longitudinal magnon dispersions for Sr 3 Ir 2 O 7 using the quantum-dimer model reported in Ref.…”

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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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“…In perovskite manganites, the parent antiferromagnetic (AFM) order develops into a ferromagnetic (FM) phase hosting giant magnetoresistance [2]. On the other hand, in both S = 1/2 cuprates [1] and J eff = 1/2 iridates [3][4][5][6], doping suppresses long-range AFM order leading to the formation of incommensurate spin-density wave order [7][8][9][10] with a conventional paramagnetic (PM) metal eventually emerging.…”

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Persistence of antiferromagnetic order upon La substitution in the 4d4 Mott insulator Ca2RuO4

et al. 2018

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The chemical and magnetic structures of the series of compounds Ca 2−x La x RuO 4 [x = 0, 0.05(1), 0.07(1), 0.12(1)] have been investigated using neutron diffraction and resonant elastic x-ray scattering. Upon La doping, the low-temperature S-P bca space group of the parent compound is retained in all insulating samples [x 0.07(1)], but with significant changes to the atomic positions within the unit cell. These changes can be characterized in terms of the local RuO 6 octahedral coordination: with increasing doping, the structure, crudely speaking, evolves from an orthorhombic unit cell with compressed octahedra to a quasitetragonal unit cell with elongated ones. The magnetic structure on the other hand, is found to be robust, with the basic k = (0,0,0), b-axis antiferromagnetic order of the parent compound preserved below the critical La doping concentration of x ≈ 0.11. The only effects of La doping on the magnetic structure are to suppress the A-centred mode, favoring the B mode instead, and to reduce the Néel temperature somewhat. Our results are discussed with reference to previous experimental reports on the effects of cation substitution on the d 4 Mott insulator Ca 2 RuO 4 , as well as with regard to theoretical studies on the evolution of its electronic and magnetic structure. In particular, our results rule out the presence of a proposed ferromagnetic phase, and suggest that the structural effects associated with La substitution play an important role in the physics of the system.

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“…13. While we have not calculated it explicitly at the Os L 3 edge, we expect the momentum resolution of the spectrometer to be of the same order as that determined for the Ir L 3 edge [58,76]. Using the experimental value of the spin-wave gap, and taking Q = 0.17Å −1 , then we find that = 0.5(3) meV [ Fig.…”

Section: Discussion and Summarymentioning

confidence: 99%

“…[22] is likely to be an overestimate. This is a direct result of the finite momentum resolution of the RIXS spectrometer, which most prominently affects the magnetic excitations at the Brillouin zone center, where the dispersion is steepest [58]. We estimate the inplane momentum resolution Q ≈ 0.17Å −1 (at FWHM).…”

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Crossover from itinerant to localized magnetic excitations through the metal-insulator transition inNaOsO3

et al. 2018

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NaOsO 3 undergoes a metal-insulator transition (MIT) at 410 K, concomitant with the onset of antiferromagnetic order. The excitation spectra have been investigated through the MIT by resonant inelastic x-ray scattering (RIXS) at the Os L 3 edge. Low resolution ( E ∼ 300 meV) measurements over a wide range of energies reveal that local electronic excitations do not change appreciably through the MIT. This is consistent with a picture in which structural distortions do not drive the MIT. In contrast, high resolution ( E ∼ 56 meV) measurements show that the well-defined, low-energy magnons in the insulating state weaken and dampen upon approaching the metallic state. Concomitantly, a broad continuum of excitations develops which is well described by the magnetic fluctuations of a nearly antiferromagnetic Fermi liquid. By revealing the continuous evolution of the magnetic quasiparticle spectrum as it changes its character from itinerant to localized, our results provide unprecedented insight into the nature of the MIT in NaOsO 3 . In particular, the presence of weak correlations in the paramagnetic phase implies a degree of departure from the ideal Slater limit.

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Anisotropic exchange and spin-wave damping in pure and electron-doped Sr2IrO4

Cited by 36 publications

References 31 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

Persistence of antiferromagnetic order upon La substitution in the 4d4 Mott insulator Ca2RuO4

Crossover from itinerant to localized magnetic excitations through the metal-insulator transition inNaOsO3

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