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Learmonth, Timothy; McGuinness, Cormac; Glans, Per‐Anders; Kennedy, Brian; John, J. St.; Guo, Jinghua; Greenblatt, Martha; Smith, Kevin

doi:10.1103/physrevb.79.035110

Cited by 11 publications

(11 citation statements)

References 30 publications

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“…As the oxygen ratio increased, the O 2p peak at ca 5 eV evolved by hybridization with Cu 3d. These values are 4.5, and ~6 eV below the Fermi level [23]. The increase of the partial density of state at 5 eV indicates Cu was oxidized.…”

Section: Resultsmentioning

confidence: 96%

Spectroscopic and Morphological Investigation of Copper Oxide Thin Films Prepared by Magnetron Sputtering at Various Oxygen Ratios

Park¹,

Lim²,

Ramsier³

et al. 2011

Bulletin of the Korean Chemical Society

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Copper oxide thin films were synthesized by reactive radio frequency magnetron sputtering at different oxygen gas ratios. The chemical and physical properties of the thin films were investigated by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffraction (XRD). XPS results revealed that the dominant oxidation states of Cu were Cu 0 and Cu + at 0% oxygen ratio. When the oxygen ratios increased above 5%, Cu was oxidized as CuO as detected by X-ray induced Auger electron spectroscopy and the Cu(OH) 2 phase was confirmed independent of the oxygen ratio. The valence band maxima were 1.19 ± 0.09 eV and an increase in the density of states was confirmed after formation of CuO. The thickness and roughness of copper oxide thin films decreased with increasing oxygen ratio. The crystallinity of the copper oxide films changed from cubic Cu through cubic Cu 2 O to monoclinic CuO with mean crystallite sizes of 8.8 nm (Cu) and 16.9 nm (CuO) at the 10% oxygen ratio level.

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Section: Resultsmentioning

confidence: 96%

Spectroscopic and Morphological Investigation of Copper Oxide Thin Films Prepared by Magnetron Sputtering at Various Oxygen Ratios

Park¹,

Lim²,

Ramsier³

et al. 2011

Bulletin of the Korean Chemical Society

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“…21,27,28,47,65 In order for the incident-beam polarization to have a large c-axis component ͑as in Ref. 35͒ while maintaining a ϳ90°scatter-ing angle, the measurements were carried out at the Q positions of ͑3.5 0 6͒, ͑3.5 0.25 6͒, ͑3.5,0.5,6͒, and ͑3 0 8.5͒ for reduced momentum q of ͑ 0͒, ͑ / 2͒, ͑ ͒, and ͑0 0͒, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The scattering plane was horizontal, with the incident polarization parallel to the scattering plane (π-polarization) and the scattering angle was set to nearly 90 degrees, thereby suppressing the background from the elastic peak. 21,27,28,47,65 In order for the incident beam polarization to have a large c-axis component (as in Ref. 35) while maintaining a ∼90 degree scattering angle, the measurements were carried out at the Q-positions of (3.5 0 6), (3.5 0.25 6), (3.5,0.5,6) and (3 0 8.5) for reduced momentum q of (π 0), (π π/2), (π π) and (0 0), respectively.…”

Section: Methodsmentioning

confidence: 99%

Magnetic nature of the 500 meV peak inLa2−xSrxCuO4observed with resonant inelastic x-ray scattering at t

et al. 2010

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We present a comprehensive study of the temperature and doping dependence of the 500 meV peak observed at q = ͑ ,0͒ in resonant inelastic x-ray scattering ͑RIXS͒ experiments on La 2 CuO 4 . The intensity of this peak persists above the Néel temperature ͑T N = 320 K͒, but decreases gradually with increasing temperature, reaching zero at around T = 500 K. The peak energy decreases with temperature in close quantitative accord with the behavior of the two-magnon B 1g Raman peak in La 2 CuO 4 and, with suitable rescaling, agrees with the Raman peak shifts in EuBa 2 Cu 3 O 6 and K 2 NiF 4 . The overall dispersion of this excitation in the Brillouin zone is found to be in agreement with theoretical calculations for a two-magnon excitation. Upon doping, the peak intensity decreases analogous to the Raman mode intensity and appears to track the doping dependence of the spincorrelation length. Taken together, these observations strongly suggest that the 500 meV mode is magnetic in character and is likely a two-magnon excitation.

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“…The possibility of measuring momentum dependence at the Oxygen K edge has also been suggested (Okada and Kotani, 2007). Learmonth et al (2009) used oxygen K-edge RIXS to probe the electronic structure of the band insulator α-MoO 3 and observe that when the incident energy is resonantly tuned to the π states at the Fermi level, momentum selectivity allows the observation of states only near certain symmetry points reflecting the highly anisotropic electronic structure of α-MoO 3 .…”

Section: Early Workmentioning

confidence: 99%

Resonant inelastic x-ray scattering studies of elementary excitations

et al. 2011

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In the past decade, Resonant Inelastic X-ray Scattering (RIXS) has made remarkable progress as a spectroscopic technique. This is a direct result of the availability of highbrilliance synchrotron X-ray radiation sources and of advanced photon detection instrumentation. The technique's unique capability to probe elementary excitations in complex materials by measuring their energy-, momentum-, and polarization-dependence has brought RIXS to the forefront of experimental photon science. We review both the experimental and theoretical RIXS investigations of the past decade, focusing on those determining the low-energy charge, spin, orbital and lattice excitations of solids. We present the fundamentals of RIXS as an experimental method and then review the theoretical state of affairs, its recent developments and discuss the different (approximate) methods to compute the dynamical RIXS response. The last decade's body of experimental RIXS data and its interpretation is surveyed, with an emphasis on RIXS studies of correlated electron systems, especially transition metal compounds. Finally, we discuss the promise that RIXS holds for the near future, particularly in view of the advent of x-ray laser photon sources.

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Resonant soft x-ray inelastic scattering and soft x-ray emission study of the electronic structure ofα-MoO3

Cited by 11 publications

References 30 publications

Spectroscopic and Morphological Investigation of Copper Oxide Thin Films Prepared by Magnetron Sputtering at Various Oxygen Ratios

Spectroscopic and Morphological Investigation of Copper Oxide Thin Films Prepared by Magnetron Sputtering at Various Oxygen Ratios

Magnetic nature of the 500 meV peak inLa2−xSrxCuO4observed with resonant inelastic x-ray scattering at t

Resonant inelastic x-ray scattering studies of elementary excitations

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