Resonance induced divalent Eu states in EuF3 ultrathin layer

Szade, J.; Burian, W.; Celiński, Z.; O’Keevan, T.; Zangrando, Marco; Bondino, Federica; Magnano, Elena

doi:10.1016/j.susc.2005.02.020

Cited by 6 publications

(4 citation statements)

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“…The resonant photoemission signal of the europium ion is measured at the 4d and 3d absorption edges where the spectroscopic signals coming from the two oxidation states are well separated. [26][27][28][29][30][31][32][33] The results obtained at the Eu 3d -4f transition (M 4,5 absorption edge) are reported in Fig. 3.…”

Section: Resonant Photoemission Signalmentioning

confidence: 95%

“…The first one located at a binding energy of 2 eV is normally induced by Eu 2+ states and the second one located at around 7.5 eV is commonly associated with Eu 3+ states. 29,[31][32][33] Similar to 3d -4f transitions, the resonant signals at 4d -4f are described by a two-step excitation/de-excitation process according to the following equation: Eu 4d 10 4f n + hn-(Eu 4d 9 4f n+1 )* -Eu 4d 10 4f nÀ1 + e À with ''*'' designating an excited state, n corresponding to the number of electrons filling the 4f level equal to, respectively, n = 6 or 7 for Eu 2+ or Eu 3+ states. The observed final states are equivalent to those that would result from a direct photoemission process of electrons coming from 4f levels.…”

Section: Resonant Photoemission Signalmentioning

confidence: 99%

“…charge transfer processes. 32,33 Usually, the NEXAFS experiment needs a spectroscopic reference to properly assign the electronic properties and chemical composition of a material. 12,31,34 Here it is shown that the use of the combination of HRPES, NEXAFS and RESPES overcomes this limitation and provides a powerful method to determine both the composition as well as the distribution of various oxides at the surface.…”

Section: Introductionmentioning

confidence: 99%

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The electronic properties of mixed valence hydrated europium chloride thin film

Charra

Lux

Lemercier

et al. 2015

Phys. Chem. Chem. Phys.

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We investigate the electronic properties of a model mixed-valence hydrated chloride europium salt by means of high resolution photoemission spectroscopy (HRPES) and resonant photoemission spectroscopy (RESPES) at the Eu 3d → 4f and 4d → 4f transitions. From the HRPES spectra, we have determined that the two europium oxidation states are homogeneously distributed in the bulk and that the hydrated salt film is exempt from surface mixed valence transition. From the RESPES spectra, the well separated resonant contributions characteristic of divalent and trivalent europium species (4f(6) and 4f(7) final states, respectively) are accurately extracted and quantitatively determined from the resonant features measured at the two edges. The partial absorption yield spectra, obtained by integrating the photoemission intensity in the valence-band region, can be well reproduced by atomic multiplet calculation at the M(4,5) (3d-4f) absorption edge and by an asymmetric Fano-like shape profile at the N(4,5) (4d-4f) absorption edge. The ratio of Eu(2+) and Eu(3+) species measured at the two absorption edges matches with the composition of the mixed valence europium salt as determined chemically. We have demonstrated that the observed spectroscopic features of the mixed valence salt are attributed to the mixed-valence ground state rather than surface valence transition. HRPES and RESPES spectra provide reference spectra for the study of europium salts and their derivatives.

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Section: Resonant Photoemission Signalmentioning

confidence: 95%

Section: Resonant Photoemission Signalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The electronic properties of mixed valence hydrated europium chloride thin film

Charra

Lux

Lemercier

et al. 2015

Phys. Chem. Chem. Phys.

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“…Resonant photoemission spectroscopy (RESPES) has for example successfully been used to quantitatively extract the amount of the various valences present in mixed valence compounds [40] and bring information onto charge transfer processes. [41] It consists in scanning the photon energy of a soft-X ray beam in the range of a specific absorption edge and measuring the valence band spectra for these scanned energies. The advantage of this technique is to selectively enhance the valence band signal of a specific element.…”

Section: Resultsmentioning

confidence: 99%

Nonmonotonous temperature fluctuations of the orbital moment and spin-orbit coupling in multiferroic gallium ferrite thin films

et al. 2022

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