Multiple-scattering theory of magnetic x-ray circular dichroism

Brouder, Christian; Hikam, Muhammad

doi:10.1103/physrevb.43.3809

Cited by 91 publications

(28 citation statements)

References 38 publications

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“…Unfortunately the interpretation of the XMCD signal at the K-edge of transition metals is far from being unanimously agreed upon and no such theory as that mentioned above for the L edges is available. Three different theoretical approaches can be found in the literature: i) a full relativistic multiplescattering approach (Ebert et al, 1988), (Guo, 1996), (Guo, 1997), (Ankudinov & Rehr, 1997), ii) multiple scattering theory with a non-relativistic description of the electrons (Brouder & Hikam, 1991) and iii) band structure calculations using a tight binding approximation (Igarashi & Hirai, 1994), (Igarashi & Hirai, 1996). But up to now, there is still a lack of a theoretical description able to fully describe the experimental data.…”

Section: K-edge Xmcd On 3d Transition Metalsmentioning

confidence: 99%

XMCD under pressure at the FeKedge on the energy-dispersive beamline of the ESRF

Mathon¹,

Baudelet

Itié

et al. 2004

J Synchrotron Rad

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The present paper demonstrates the feasibility of X-ray Absorption Spectroscopy (XAS) and X-ray Magnetic Circular Dichroism (XMCD) at high pressure at the Fe-K edge on the ID24 energy dispersive beamline of the ESRF.In 3d transition metals, performing experiments at the hard X-ray K-edge rather than at the magnetically interesting soft X-ray L-edges represents, the only way to access the high pressure regime obtainable with Diamond Anvil Cells.The simultaneous availability of a local structure (XAS) and of a magnetic (XMCD) probe on the sample in identical thermodynamical conditions is essential to study correlations between local structural and magnetic properties.We briefly summarize the state of the art theoretical understanding of K-edge XMCD data, then illustrate the setup of beamline ID24 for high pressure XMCD experiments and underline the conditions required to perform measurements at the Kedges of 3d transition metals. Finally, we present two examples of recent high pressure results at the Fe-K edge in pure Fe and Fe 3 O 4 powder.

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Section: K-edge Xmcd On 3d Transition Metalsmentioning

confidence: 99%

XMCD under pressure at the FeKedge on the energy-dispersive beamline of the ESRF

Mathon¹,

Baudelet

Itié

et al. 2004

J Synchrotron Rad

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“…During the absorption process the atom undergoes a transition from an initial state to a final state and when the absorption cross section is expressed in the electric dipole approximation the interaction Hamiltonian reads b‚r b, where b is the polarization vector characterizing the photon beam. [9][10][11][12][13] XMCD is performed when the cross section of a magnetic sample is registered for circularly polarized light. The XMCD signal is the difference between the two cross sections for left ( b‚r b ) (x + iy)/ 2) and right ( b‚r b ) (-x + iy)/ 2) circularly polarized light.…”

Section: X-ray Absorption Spectroscopy and X-ray Magnetic Circular DImentioning

confidence: 99%

Measurement of Magnetic Moment at the Atomic Scale in a High T_C Molecular Based Magnet

et al. 1996

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The molecular-based magnet Cs I [Ni II Cr III (CN) 6 ]‚2H 2 O is a ferromagnetic with a Curie temperature T C ) 90 K. Its structure consists of face-centered cubic lattice of Ni II ions connected by Cr(CN) 6 entities. We have recorded X-ray magnetic circular dichroism (XMCD) at nickel L 2,3 edges. It clearly evidences that nickel(II) is in a high-spin configuration and ferromagnetically coupled to the surrounding Cr III . Through ligand field multiplet calculations, we have determined the total magnetic moment carried by Ni II . Special attention has been paid to the magnetic anisotropy that complicates the calculation of the cross section for a powder. By using sum rules derived for XMCD, it has been possible to extract the orbital and spin contributions to the total magnetic moment. A somewhat too small magnetic moment is found on nickel. A complete calculation taking into account the multiplet coupling effect and the covalent hybridization allowed to determine the precise ground state of nickel and showed that hybridization cannot be responsible for the experimental low nickel magnetic moment. The origin of this effect is discussed.

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“…5. The amplitude of the dichroic L 2 , 3 signal is of an order of magnitude larger than that of the Fe K edge due to a much weaker spin-orbit coupling in the final states of the latter [35].…”

Section: B Lutetium L Iiiii -And Ruthenium L Ii -Edge Xanes and Xmcmentioning

confidence: 89%

“…6 reveal a 5d magnetic moment at the Lu sites in Lu 2 Fe 16.5 Ru 0.5 . Left (right) circularly polarized x rays excite more spin-up (spin-down) electrons from the 2p 3/2 level [35]. The opposite is the case for the 2p 1/2 level.…”

Section: B Lutetium L Iiiii -And Ruthenium L Ii -Edge Xanes and Xmcmentioning

confidence: 99%

Experimental and theoretical study of magnetic ordering and local atomic polarization in Ru-substitutedLu2Fe17

et al. 2014

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The distribution of magnetic moments in the iron-rich intermetallic compound Lu 2 Fe 17 with Fe partly substituted by Ru has been investigated on Lu 2 Fe 16.5 Ru 0.5 by using several techniques. The crystal structure and temperature evolution of the magnetic structure was studied using high resolution and high flux neutron powder diffractometers. In contrast to the parent Lu 2 Fe 17 , which transforms on cooling from an antiferromagnetic to a ferromagnetic state, Lu 2 Fe 16.5 Ru 0.5 is an antiferromagnet (Néel temperature T N = 208 K) down to the lowest temperatures. The magnetic polarization at the lutetium L 2,3 absorption edges, iron K and ruthenium L 2 edges was studied by x-ray magnetic circular dichroism (XMCD) on a single crystal of Lu 2 Fe 16.5 Ru 0.5 in a magnetic field of 3 T, i.e., above the field-induced metamagnetic transition. The Ru XMCD signal proves the existence of induced magnetic polarization parallel to the dominant Fe sublattice magnetization. A corresponding theoretical analysis in the framework of the local spin density formalism is provided in order to discern the structural disorder effects and magnetism in the system.

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Multiple-scattering theory of magnetic x-ray circular dichroism

Cited by 91 publications

References 38 publications

XMCD under pressure at the FeKedge on the energy-dispersive beamline of the ESRF

XMCD under pressure at the FeKedge on the energy-dispersive beamline of the ESRF

Measurement of Magnetic Moment at the Atomic Scale in a High T_C Molecular Based Magnet

Experimental and theoretical study of magnetic ordering and local atomic polarization in Ru-substitutedLu2Fe17

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Multiple-scattering theory of magnetic x-ray circular dichroism

Cited by 91 publications

References 38 publications

XMCD under pressure at the FeKedge on the energy-dispersive beamline of the ESRF

XMCD under pressure at the FeKedge on the energy-dispersive beamline of the ESRF

Measurement of Magnetic Moment at the Atomic Scale in a High TC Molecular Based Magnet

Experimental and theoretical study of magnetic ordering and local atomic polarization in Ru-substitutedLu2Fe17

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Product

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Measurement of Magnetic Moment at the Atomic Scale in a High T_C Molecular Based Magnet