<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>α</mml:mi><mml:mtext>−</mml:mtext><mml:mi>γ</mml:mi></mml:mrow></mml:math>transition in metallic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi></mml:mrow></mml:math>studied by resonant x-ray spectroscopies

Dallera, C.; Grioni, M.; Palenzona, A.; Taguchi, M.; Annese, E.; Ghiringhelli, G.; Tagliaferri, Alberto; Brookes, N. B.; Neisius, Thomas; Braicovich, L.

doi:10.1103/physrevb.70.085112

Cited by 45 publications

(48 citation statements)

References 46 publications

(42 reference statements)

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“…It is customary to relate the deviation from n 4f = 1 to the formal Ce valence V via the relation V = 3 + (1 − n 4f ). As in photoemission, its presence manifests itself through the appearance of additional spectral signatures in XA spectra 6,[55][56][57][58][59] , whose intensities vary proportionally to the magnitude of the f 0 admixture to first order. In the Ce M 4,5 XA spectra of Fig.…”

Section: B Electronic and Magnetic Propertiesmentioning

confidence: 99%

Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice:CePt5/Pt(111)

et al. 2015

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We present an extensive study of structure, composition, electronic and magnetic properties of Ce-Pt surface intermetallic phases on Pt(111) as a function of their thickness. The sequence of structural phases appearing in low energy electron diffraction (LEED) may invariably be attributed to a single underlying intermetallic atomic lattice. Findings from both microscopic and spectroscopic methods, respectively, prove compatible with CePt5 formation when their characteristic probing depth is adequately taken into account. The intermetallic film thickness serves as an effective tuning parameter which brings about characteristic variations of the Cerium valence and related properties. Soft x-ray absorption (XAS) and magnetic circular dichroism (XMCD) prove well suited to trace the changing Ce valence and to assess relevant aspects of Kondo physics in the CePt5 surface intermetallic. We find characteristic Kondo scales of the order of 10 2 K and evidence for considerable magnetic Kondo screening of the local Ce 4f moments. CePt5/Pt(111) and related systems therefore appear to be promising candidates for further studies of low-dimensional Kondo lattices at surfaces.

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Section: B Electronic and Magnetic Propertiesmentioning

confidence: 99%

Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice:CePt5/Pt(111)

et al. 2015

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“…In addition, since 5f orbitals are generally more delocalized than 4f orbitals, the ability of the 5f orbital to screen the core hole can vary from sample to sample, further confusing the interpretation of actinide L 3 -edge XANES spectra. Here, we demonstrate the use of the resonant x-ray emission spectroscopy (RXES) technique from the L 3 edge, which has been used successfully on a range of intermediate-valent lanthanide intermetallics [12,13,14,15], to help overcome these limitations in plutonium intermetallic compounds. Figure 1: Schematic of the RXES process.…”

Section: Introductionmentioning

confidence: 99%

Delocalization and occupancy effects of 5f orbitals in plutonium intermetallics using L3-edge resonant X-ray emission spectroscopy

Booth

Medling

Jiang

et al. 2014

Journal of Electron Spectroscopy and Related Phenomena

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Although actinide (An) L 3 -edge x-ray absorption near-edge structure (XANES) spectroscopy has been very effective in determining An oxidation states in insulating, ionically-bonded materials, such as in certain coordination compounds and mineral systems, the technique fails in systems featuring more delocalized 5f orbitals, especially in metals. Recently, actinide L 3 -edge resonant x-ray emission spectroscopy (RXES) has been shown to be an effective alternative. This technique is further demonstrated here using a parametrized partial unoccupied density of states method to quantify both occupancy and delocalization of the 5f orbital in α-Pu, δ-Pu, PuCoGa 5 , PuCoIn 5 , and PuSb 2 . These new results, supported by FEFF calculations, highlight the effects of strong correlations on RXES spectra and the technique's ability to differentiate between f -orbital occupation and delocalization.

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“…A well-known example is Ce metal, which undergoes an isostructural volume collapse under pressure that changes its valence and suppresses the Curie-Weiss paramagnetic response [42]. Both metallic and insulating Kondo lattice compounds can be described by a periodic Anderson model, a fact exploited in the classification of topological Kondo insulators [2].…”

mentioning

confidence: 99%

Pressure-Resistant Intermediate Valence in the Kondo InsulatorSmB6

et al. 2016

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Resonant x-ray emission spectroscopy (RXES) was used to determine the pressure dependence of the f-electron occupancy in the Kondo insulator SmB6. Applied pressure reduces the f-occupancy, but surprisingly, the material maintains a significant divalent character up to a pressure of at least 35 GPa. Thus, the closure of the resistive activation energy gap and onset of magnetic order are not driven by stabilization of an integer valent state. Over the entire pressure range, the material maintains a remarkably stable intermediate valence that can in principle support a nontrivial band structure.

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α−γtransition in metallicCestudied by resonant x-ray spectroscopies

Cited by 45 publications

References 46 publications

Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice:CePt5/Pt(111)

Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice:CePt5/Pt(111)

Delocalization and occupancy effects of 5f orbitals in plutonium intermetallics using L3-edge resonant X-ray emission spectroscopy

Pressure-Resistant Intermediate Valence in the Kondo InsulatorSmB6

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