E. Dartyge

ADIR Association

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A. Fontaine

Institut Bergonié

F. Baudelet

Synchrotron soleil

S. Pizzini

Institut Néel

G. Tourillon

Institut de Recherches sur la Catalyse et l'Environnement de Lyon

G. Krill

Centre National de la Recherche Scientifique

C. Giorgetti

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

A. Fontaine

Federal Agency for Food Chain Safety

J.P. Kappler

Synchrotron soleil

Christian Brouder

Institut de minéralogie, de physique des matériaux et de cosmochimie

H. Tolentino

Brazilian Synchrotron Light Laboratory

Cooperative Institutions

Centre National de la Recherche Scientifique

166

Université Paris-Sud

Université Paris Cité

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Sorbonne Université

Laboratoire de Physique du Rayonnement et de la Lumière

Université Paris-Saclay

Synchrotron soleil

ADIR Association

Campus France

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From the as-quenched to the annealed state in icosahedral AlCuFe. effect of phasons on the local order

Phase Transitions (1991)

A. Sadoc E. Dartyge F. Baudelet Y. Calvayrac

Abstract Rapidly solidified Al63Cu25Fe12 icosahedral alloys have been studied by extended X-ray absorption fine structure (EXAFS) in the as-quenched state and after annealing. Moreover, the temperature dependence of the EXAFS spectra have been studied in detail for the two types of states during in-situ time resolved experiments.

Local structure

10.1080/01411599108219164

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Citations (3)

Effects of spin-dependent spectral weight on magnetic circular x-ray dichroism: Applications toR(NixCo

Physical review. B, Condensed matter (1995)

R.M. Galéra S. Pizzini J.A. Blanco Jean‐Pascal Rueff A. Fontaine

This systematic study of R(${\mathrm{Ni}}_{\mathit{x}}$${\mathrm{Co}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${)}_{5}$ compounds (R=La, Gd, and Tb) has allowed us to investigate the combined effects of the 3d-5d hybridization and 4f-5d exchange on the rare-earth ${\mathit{L}}_{2,3}$-edge magnetic circular x-ray dichroism (MCXD) signal. In La compounds, where the 5d polarization results only from the magnetic transition metals via the hybridization of 5d and 3d bands, the MCXD signal scales with the 5d moment and can be explained by a one-particle model for the absorption process. When the 4f-5d exchange intervenes, like in the Gd and Tb compounds, its effects on the MCXD sign, amplitude, and the amplitude variations are very important. A description of the ${\mathit{L}}_{2,3}$-edge MCXD spectra taking into account the spin-dependence of the radial matrix elements explains qualitatively the results of this study.

Exchange interaction

10.1103/physrevb.51.15957

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Citations (11)

Pressure-induced spin-state crossovers in six-coordinate cobalt(II) complexes: a near-edge x-ray absorption study

Inorganic Chemistry (1991)

Claude Roux Jacqueline Zarembowitch J. P. Itié M. Verdaguer E. Dartyge

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure-induced spin-state crossovers in six-coordinate cobalt(II) complexes: a near-edge x-ray absorption studyC. Roux, J. Zarembowitch, J. P. Itie, M. Verdaguer, E. Dartyge, A. Fontaine, and H. TolentinoCite this: Inorg. Chem. 1991, 30, 16, 3174–3179Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://doi.org/10.1021/ic00016a014RIGHTS & PERMISSIONSArticle Views280Altmetric-Citations31LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (691 KB) Get e-Alerts Get e-Alerts

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10.1021/ic00016a014

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Citations (40)

X-ray absorption spectroscopy of the 90K superconductor YBa2Cu3O7??

Zeitschrift für Physik B Condensed Matter (1987)

F. Baudelet G. Collin E. Dartyge A. Fontaine J.P. Kappler

X-ray absorption spectroscopy

10.1007/bf01307269

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Citations (71)

XMCD at theLII,IIIedges of Er inErMn2,Physical Review B (2004)

C. Giorgetti E. Dartyge F. Baudelet R.M. Galéra

X-ray magnetic circular dichroism (XMCD) measurements have been performed at the ${\mathit{L}}_{\text{II},\text{III}}$ edges of Er in the intermetallic compounds ${\text{ErMn}}_{2}$, ${\text{ErFe}}_{2}$, ${\text{ErCo}}_{2}$, ${\text{ErNi}}_{2}$, and ${\text{ErAl}}_{2}$, as well as in the ionic compound ${\text{Er}}_{2}{({\text{SO}}_{4})}_{3},8{\mathrm{H}}_{2}0$, in order to study the evolution of the XMCD spectra as a function of the $5d$ states filling and∕or their hybridization with magnetic or nonmagnetic electronic states. Almost all the spectra present the same general features, confirming that the $4f\text{\ensuremath{-}}5d$ intra-atomic coupling is a key point to explain XMCD spectra. Thus, we analyze the models based on this interaction, proposed to account for the unexpected sign of $\mathit{E}1\text{\ensuremath{-}}\text{XMCD}$ measurements, as well as the nonstatistical branching ratio between XMCD at the ${\mathit{L}}_{\text{II}}$ and ${\mathit{L}}_{\text{III}}$ edges. We underline the impossibilities of reproducing our measurements using these models. Moreover, we point out the special role played by Fe which leads, at the ${\mathit{L}}_{\text{II}}$ edge of Er, to a significant modification of the shape of XMCD spectrum and an unexpected temperature dependence. The XMCD revealed an unexpected behavior of the $5d$ magnetic polarization in these compounds which is not visible in macroscopic measurements. This also demonstrates the non-negligible role played by the $5d\text{\ensuremath{-}}3d$ hybridization.

10.1103/physrevb.70.035105

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Citations (24)

Rare-earth contributions to the x-ray magnetic circular dichroism at the CoKedge in rare-earth–cobalt compounds investigated by multiple-scattering calculations

Physical review. B, Condensed matter (1998)

Jean‐Pascal Rueff R.M. Galéra Ch. Giorgetti E. Dartyge Christian Brouder

The X-ray magnetic circular dichroism (XMCD) has been measured at the Co K edge in Co-hcp and R-Co compounds (R=La, Tb, Dy). The structure of the experimental XMCD spectra in the near-edge region has been observed to be highly sensitive to the magnetic environment of the absorbing site. Calculations of the XMCD have been carried out at the Co K edge in Co metal, LaCo$_5$ and TbCo$_5$ within the multiple-scattering framework including the spin-orbit coupling. In the three systems, the XMCD spectra in the near-edge region are well reproduced. The possibility to separate and quantitatively estimate the local effects from those due to the neighboring atoms in the XMCD cross section makes possible a more physical understanding of the spectra. The present results emphasize the major role played by the $d$ states of the Tb ions in the XMCD spectrum at the Co K edge in the TbCo$_5$ compound.

10.1103/physrevb.58.12271

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Citations (41)

Magnetic dichroism with synchrotron radiation

Physica Scripta (1993)

G. Krill Jean-Philippe Schillé Philippe Sainctavit Christian Brouder C. Giorgetti

Magnetic X-ray Dichroism (MXD) is related to the dependence of the absorption cross-section of a given atom (with well-defined angular momentum) with the state of polarization of light. Synchrotron Radiation (SR) sources, because of their well-defined states of polarization, their highflux and high brilliance, are thus ideal to perform MXD experiments even in those cases where the total number of absorbing atoms does not exceed 1015 which is interesting in the case of surface magnetism. We consider how the magnetic absorption cross-section may be directly related to the local magnetic properties of the absorbing atom via spin-orbit coupling and exchange interactions. Taking benefit of selection rules, the ability to separate the contributions to the total angular momentum (i.e. the magnetic moment) of individual electronic shells (s, p, d, f) is shown. Moreover, the possibility to separate the orbital and spin contribution is addressed. The high selectivity explains why MXD appears to be a unique tool for the study of magnetism.

Magnetism

Dichroism

10.1088/0031-8949/1993/t49a/052

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Citations (4)

X-ray magnetic circular dichroism at the GdL2,3absorption edges in GdN layers: The influence of lattice expansion

Physical Review B (2006)

F. Leuenberger Anne Parge W. Felsch F. Baudelet C. Giorgetti

We have measured core-level x-ray-absorption spectra and x-ray magnetic circular dichroism (XMCD) at the $\mathrm{Gd}\text{\ensuremath{-}}{L}_{2,3}$ edges to characterize the low-lying $\mathrm{Gd}\text{\ensuremath{-}}5d$ derived conduction-band states in thin films of the $4f$ ferromagnet GdN with a unit-cell volume 8.6% above that of bulklike layers. The nonequilibrium structure is obtained by ${\mathrm{N}}^{+}$ plasma-assisted reactive sputter deposition at room temperature. The Curie temperature ${T}_{C}$, a key quantity for magnetism, amounts to only half the bulk value of $\ensuremath{\sim}60\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ indicating a significant reduction of the effective exchange interaction between the $4f$ states. An intricate observation is that the ratio of the dichroic signal amplitudes in the lattice-expanded layers, $\ensuremath{\mid}{L}_{3}∕{L}_{2}\ensuremath{\mid}$, is up to three times higher than the value expected from the degeneracy of the $2{p}_{3∕2}$ and $2{p}_{1∕2}$ core states, which is observed for the bulklike layers. This is mainly due to a reduced ${L}_{2}$ XMCD amplitude. We suggest that the effect may be related to the different weight the crystal-field split $\mathrm{Gd}\text{\ensuremath{-}}5d$ final states (${t}_{2\mathrm{g}}$ and ${e}_{\mathrm{g}}$) have in the absorption process at the ${L}_{2}$ and ${L}_{3}$ edges, and to the special electronic band structure of this strongly correlated material and its modification upon lattice expansion. This hypothesis is supported by the observation that the ${L}_{2}$ absorption edge is shifted to lower energies upon ferromagnetic ordering while the ${L}_{3}$-edge position remains inert.

10.1103/physrevb.73.214430

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Citations (46)

Electronic and structural modifications of organic molecules under very high pressure: A dispersive x ray absorption study

High Pressure Research (1991)

Daniel Guay J. P. Itié G. Tourillon E. Dartyge A. Fontaine

Abstract 3-ethyl selenophene has been invest igated by x-ray absorption spectroscopy (XAS) up to 32 GPa at the Se K edge. A solidification of the material is observed at the beginning of the pressure cycle, while the aromatic ring is broken at pressure above 16 GPa. The compound recovered after the pressure cycle reacts with the environment and is insoluble and infusible. On the basis of the radial distribution function surrounding the Se atoms, it is thought to have a R-Se-Se-R structure, where R could be C, O or H atoms. Le 3-ethyl sélénophéne a été étudié sous pression jusqu' à 32 CPa par spectroscopie d'absorption X en mode dispersif au seuil K du sélénium au début de la compression, une solidification du composé est observée, alors que le cyle aromatique est détruit pour des pressions supérieures à 16 GPa. Le produit récuphré aprés le cycle de pression réagit avec I'environment et est insoluble et infusible. Sur la base de la fonction de distribution radial de I'atome de sélénium, une st ruc t ure du type R-Se-Se-R est proposée pour I'environnement immédiat du sélénium, avec R pouvant ětre C, O ou H.

X-ray absorption spectroscopy

10.1080/08957959108245534

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High-pressure phase transition in gallium phosphide: An x-ray-absorption spectroscopy study

Physical review. B, Condensed matter (1989)

J. P. Itié A. Polian C Jauberthie-Carillon E. Dartyge A. Fontaine

High-pressure behavior of GaP has been studied by x-ray-absorption spectroscopy in a diamond-anvil cell up to 36 GPa. The room-temperature equation of state of phase I has been determined. The transition from a fourfold (zinc-blende) to a sixfold (\ensuremath{\beta}-tin) coordination scheme is observed near 26 GPa. Analysis of the data obtained on a sample quickly depressurized from 36 GPa shows that the transition is not reversible and the recovered sample is mainly amorphous.

Gallium phosphide

Diamond anvil cell

Phosphide

X-ray absorption spectroscopy

10.1103/physrevb.40.9709

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Citations (50)