Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

Guarise, M.; Piazza, B. Dalla; Berger, H.; Giannini, E.; Schmitt, Thorsten; Rønnow, Henrik M.; Sawatzky, G. A.; Brink, Jeroen van den; Altenfeld, D.; Eremin, I.; Grioni, M.

doi:10.1038/ncomms6760

Cited by 61 publications

(102 citation statements)

References 47 publications

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“…For the nodal ( 1 4 , 1 4 ) direction, the dispersion of the doped compound is, however, strongly softened compared to La 2 CuO 4 . Whereas this effect has been reported for Bi-based [30,31] and overdoped LSCO [26], we demonstrate directly by an azimuthal scan how exactly this softening appears. Notice that the azimuthal dependence is closely related (but not exactly identical) to the scan along the antiferromagnetic zone boundary.…”

Section: Resultscontrasting

confidence: 49%

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Ivashko

Shaik

et al. 2017

Phys. Rev. B

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A resonant inelastic x-ray scattering study of overdamped spin excitations in slightly underdoped La 2−x Sr x CuO 4 (LSCO) with x = 0.12 and 0.145 is presented. Three high-symmetry directions have been investigated: (1) the antinodal (0,0) → ( 1 2 ,0), (2) the nodal (0,0) → ( 1 4 , 1 4 ), and (3) the zone-boundary direction ( 1 2 ,0) → ( 1 4 , 1 4 ) connecting these two. The overdamped excitations exhibit strong dispersions along (1) and (3), whereas a much more modest dispersion is found along (2). This is in strong contrast to the undoped compound La 2 CuO 4 (LCO) for which the strongest dispersions are found along (1) and (2). The t − t − t − U Hubbard model used to explain the excitation spectrum of LCO predicts-for constant U/t-that the dispersion along (3) scales with (t /t) 2 . However, the diagonal hopping t extracted on LSCO using single-band models is low (t /t ∼ −0.16) and decreasing with doping. We therefore invoked a two-orbital (d x 2 −y 2 and d z 2 ) model which implies that t is enhanced. This effect acts to enhance the zone-boundary dispersion within the Hubbard model. We thus conclude that hybridization of d x 2 −y 2 and d z 2 states has a significant impact on the zone-boundary dispersion in LSCO.

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Section: Resultscontrasting

confidence: 49%

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Ivashko

Shaik

et al. 2017

Phys. Rev. B

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“…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]. Of particular interest is RIXS at 2 , 1 2 level of the intermediate state, single spin-flip excitations are directly allowed at TM L 2,3 edges [3][4][5], making TM L 2,3 RIXS especially suited for investigating the magnetic dynamics in 3d (cuprates and iron pnictides) [3][4][5][6][7][8][9][10][11][12][13][14] and 5d (iridates and osmates) systems [15][16][17][18][19].…”

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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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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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“…Although RIXS by nature has the ability to measure elementary excitations for numerous materials, it has shown an especially strong ability for characterizing elementary excitations in transition-metal oxides which manifest strong correlations [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. In particular, RIXS has been shown to be quite useful for the study of high-temperature superconducting materials: As magnetic fluctuations were proposed as candidates for the superconducting pairing glue, obtaining their dispersion relation can be crucial for unraveling the mystery of high T c [22].…”

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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Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

Cited by 61 publications

References 47 publications

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Damped spin excitations in a doped cuprate superconductor with orbital hybridization

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

Using RIXS to Uncover Elementary Charge and Spin Excitations

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