Tunable-excitation soft X-ray fluorescence spectroscopy of high-Tc superconductors: an inequivalent-site seeing story

Butorin, Sergei M.; Guo, Jinghua; Wassdahl, N.; Nordgren, E.J.

doi:10.1016/s0368-2048(00)00167-5

Cited by 40 publications

(37 citation statements)

References 111 publications

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“…The difference of the Kα X-ray emission spectral profiles of UO 3 observed at 530.6 eV and 533.7 eV excitation energies can then be attributed to the significant difference in O-U hybridization between the equatorial and axial sites in this oxide. The asymmetric shape in the O Kα spectrum excited at 530.6 eV is a signature of high contribution from the O sites with strong O-U hybridization with the shortest axial (1.79 Å) bonds [6]. On the contrary, the symmetric shape of the O Kα spectrum excited at 533.7 eV is a signature of high contribution of the other oxygen site with weaker hybridization between oxygen and uranium states, forming longer equatorial O-U bonds (2.30 Å) [4,8].…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, we present the results of a resonant X-ray emission investigation at the O 1s edges of a series of uranium oxides; UO 2 , U 3 O 8 and UO 3 . Since the uranium-oxygen systems are relatively complex, the inequivalent site selectivity of the X-ray emission technique makes it particularly useful [6]. We discuss in detail the excitation energy dependence of oxygen Kα emission spectra and the electronic structures of these oxides.…”

Section: Introductionmentioning

confidence: 99%

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Uranium oxides investigated by X-ray absorption and emission spectroscopies

Magnuson

Butorin

Werme

et al. 2006

Applied Surface Science

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X-ray absorption and resonant X-ray emission measurements at the O 1s edge of the uranium oxides UO 2 , U 3 O 8 and UO 3 are presented. The spectral shapes of the O Kα X-ray emission spectra of UO 3 exhibit significant excitation energy dependence, from an asymmetric to a symmetric form, which differs from those of UO 2 and U 3 O 8 . This energy dependence is attributed to a significant difference in the oxygen-uranium hybridization between two different sites in the crystal structure of UO 3 . The spectral shapes of UO 2 and U 3 O 8 are also found to be different but without significant energy dependence. The experimental spectra of the valence and conduction bands of the uranium oxides are compared to the results of electronic structure calculations available in the literature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Uranium oxides investigated by X-ray absorption and emission spectroscopies

Magnuson

Butorin

Werme

et al. 2006

Applied Surface Science

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“…Thus, measurements of XES and x-ray absorption spectra ͑XAS͒ at the Mn L edge give information about the local partial density of states ͑DOS͒ of the Mn 3d states, and measurements at the carbon and oxygen K edges provide similar information on the 2p states for both occupied and unoccupied levels. Local partial DOSs for each nonequivalent site occupied by the same chemical species ͑for instance, by nonequivalent carbon and oxygen atoms in Mn 12 ͒ can be distinguished by the measurements of RIXS using both energy 25 and angular 26 selection. Soft x-ray emission and absorption spectra of Mn 12 acetate are presented in Figs.…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

Electronic structure of aMn12molecular magnet: Theory and experiment

et al. 2007

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We used site-selective and element-specific resonant inelastic x-ray scattering ͑RIXS͒ to study the electronic structure and the electron interaction effects in the molecular magnet ͓Mn 12 O 12 ͑CH 3 COO͒ 16 ͑H 2 O͒ 4 ͔ · 2CH 3 COOH · 4H 2 O, and compared the experimental data with the results of local spin density approximation +U electron structure calculations which include the on-site Coulomb interactions. We found a good agreement between theory and experiment for the Coulomb repulsion parameter U = 4 eV. In particular, the p-d band separation of 1.8 eV has been found from the RIXS spectra, which is in accordance with the calculations. Similarly, the positions of the peaks in the XPS spectra agree with the calculated densities of p and d states. Using the results of the electronic structure calculations, we determined the intramolecular exchange parameters, and used them for diagonalization of the Mn 12 spin Hamiltonian. The calculated exchanges gave the correct ground state with the total spin S = 10.

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“…2b. As it is known most of the intensity belongs to the resonant fluorescence 34,35 which covers the range between about 3 eV and 10 eV energy loss when the sample is excited as in Fig. 2.…”

Section: The Bimagnon At O K Edgementioning

confidence: 99%

Bimagnon studies in cuprates with resonant inelastic x-ray scattering at the OKedge. I. Assessment on La2CuO4and comparison with the excita

et al. 2012

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We assess the capabilities of magnetic Resonant Inelastic X-ray Scattering (RIXS) at the O K edge in undoped cuprates by taking La2CuO4 as a benchmark case, based on a series of RIXS measurements that we present here. By combining the experimental results with basic theory we point out the fingerprints of bimagnon in the O K edge RIXS spectra. These are a dominant peak around 450 meV, the almost complete absence of dispersion both with π and σ polarization and the almost constant intensity vs. the transferred momentum with σ polarization. This behavior is quite different from Cu L3 edge RIXS giving a strongly dispersing bimagnon tending to zero at the center of the Brillouin zone. This is clearly shown by RIXS measurements at the Cu L3 edge that we present. The Cu L3 bimagnon spectra and those at Cu K edge -both from the literature and from our data -however, have the same shape. These similarities and differences are understood in terms of different sampling of the bimagnon continuum. This panorama points out the unique possibilities offered by O K RIXS in the study of magnetic excitations in cuprates near the center of the BZ.

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Tunable-excitation soft X-ray fluorescence spectroscopy of high-Tc superconductors: an inequivalent-site seeing story

Cited by 40 publications

References 111 publications

Uranium oxides investigated by X-ray absorption and emission spectroscopies

Uranium oxides investigated by X-ray absorption and emission spectroscopies

Electronic structure of aMn12molecular magnet: Theory and experiment

Bimagnon studies in cuprates with resonant inelastic x-ray scattering at the OKedge. I. Assessment on La2CuO4and comparison with the excita

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