Resonant inelastic x-ray scattering study of the spin and charge excitations in the overdoped superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>1.77</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>0.23</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Monney, Claude; Schmitt, Thorsten; Matt, C. E.; Mesot, J.; Strocov, Vladimir N.; Lipscombe, O. J.; Hayden, Stephen M; Chang, J.

doi:10.1103/physrevb.93.075103

Cited by 43 publications

(53 citation statements)

References 53 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: 50%

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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: 50%

“…A second-order polynomial function is used to mimic the background. Finally, to analyze the spin excitations we adopted the response function of a damped harmonic oscillator [4,26,27]: vector spectra of LSCO x = 0.145 where charge order is absent.…”

Section: Resultsmentioning

confidence: 99%

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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“…2(a) In recent years, RIXS has received a lot of attention due to the huge instrumental improvements in terms of both energy resolution and flux 58,59 permitting the detection of magnetic excitations in high temperature superconductors such as cuprates and Fe pnictides [40][41][42][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95] .…”

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confidence: 99%

Local and collective magnetism ofEuFe2As2

et al. 2017

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We present an experimental study of the local and collective magnetism of EuFe 2 As 2 , that is isostructural with the high temperature superconductor parent compound BaFe 2 As 2 . In contrast to BaFe 2 As 2 , where only Fe spins order, EuFe 2 As 2 has an additional magnetic transition below 20 K due to the ordering of the Eu 2+ spins (J = 7/2, with L = 0 and S = 7/2) in an A-type antiferromagnetic texture (ferromagnetic layers stacked antiferromagnetically). This may potentially affect the FeAs layer and its local and correlated magnetism. Fe-K β x-ray emission experiments on EuFe 2 As 2 single crystals reveal a local magnetic moment of 1.3±0.15 µ B at 15 K that slightly increases to 1.45±0.15 µ B at 300 K. Resonant inelastic x-ray scattering (RIXS) experiments performed on the same crystals show dispersive broad (in energy) magnetic excitations along (0, 0) → (1, 0) and (0, 0) → (1, 1) with a bandwidth on the order of 170-180 meV. These results on local and collective magnetism are in line with other parent compounds of the AFe 2 As 2 series (A = Ba, Ca, and Sr), especially the well characterized BaFe 2 As 2 . Thus, our experiments lead us to the conclusion that the effect of the high magnetic moment of Eu on the magnitude of both Fe local magnetic moment and spin excitations is small and confined to low energy excitations.2

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Resonant inelastic x-ray scattering study of the spin and charge excitations in the overdoped superconductorLa1.77Sr0.23CuO4

Cited by 43 publications

References 53 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

Local and collective magnetism ofEuFe2As2

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