Identification of Quadrupolar Excitation Channels at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">L</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Edge of Rare-Earth Compounds

Bartolomé, Fernando; Tonnerre, J. M.; Sève, L.; Raoux, D.; Chaboy, J.; Garcı́a, L. M.; Krisch, M.; Kao, C.‐C.

doi:10.1103/physrevlett.79.3775

Cited by 71 publications

(46 citation statements)

References 26 publications

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“…The latter feature is of dipolar origin, while the former spectral feature has been associated with a quadrupolar transition (E2) that should be present at the L 3 -edge spectra of heavy rare earths. 47,48 The shape and position of this Dy feature are similar to those of other XMCD spectra of insulators containing Dy (Dy 2 O 3 ). 49 Moreover, the L 2,3 -edge XMCD spectra of the {Fe 3 DyO 2 } and {Fe 3 GdO 2 } complexes (Fig.…”

Section: A Xanes and Xmcd At A Constant Fieldsupporting

confidence: 63%

“…The XMCD signals at the Ln L 2,3 absorption edges are affected by the contribution of quadrupolar (2p → 4f ) transitions 47,[52][53][54] and by the spin dependence of the radial matrix elements of dipolar (2p → 5d) transitions. 55,56 Consequently, the sum rules cannot be used to analyze the L 2,3 -edge XMCD of lanthanide elements.…”

Section: A Xanes and Xmcd At A Constant Fieldmentioning

confidence: 99%

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Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
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The intramolecular exchange interactions within the single-molecule magnet (SMM) "butterfly" molecule [Fe 3 Ln(μ 3 -O) 2 (CCl 3 COO) 8 (H 2 O)(THF) 3 ], where Ln(III) represents a lanthanide cation, are determined in a combined experimental [x-ray magnetic circular dichroism (XMCD) and vibrating sample magnetometer (VSM)] and theoretical work. Compounds with Ln = Gd and Dy, which represent extreme cases where the rare earth presents single-ion isotropic and uniaxial anisotropy, on one hand, and with Ln = Lu and Y(III) as pseudolanthanide substitutions that supply a nonmagnetic Ln reference case, on the other hand, are studied. The Dy single-ion uniaxial anisotropy is estimated from ab initio calculations. Low-temperature (T 2.5 K) hard x-ray XMCD at the Ln L 2,3 edges and VSM measurements as a function of the field indicate that the Ln moment dominates the polarization of the molecule by the applied field. Within the {Fe 3 LnO 2 } cluster the Ln-Fe 3 subcluster interaction is determined to be antiferromagnetic in both Dy and Gd compounds, with values J Dy-Fe 3 = −0.4 K and J Gd-Fe 3 = −0.25 K, by fitting to spin Hamiltonian simulations that consider the competing effects of intracluster interactions and the external applied magnetic field. In the uniaxial anisotropic {Fe 3 DyO 2 } case, a field-induced reorientation of the Fe 3 and Dy spins from an antiparallel to a parallel orientation takes place at a threshold field (μ 0 H = 4 T). In contrast, in isotropic {Fe 3 GdO 2 } this reorientation does not occur.

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Section: A Xanes and Xmcd At A Constant Fieldsupporting

confidence: 63%

Section: A Xanes and Xmcd At A Constant Fieldmentioning

confidence: 99%

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
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“…We observed this peak at several different magnetic Bragg peaks, and it closely coincides with a quadrupole feature identified'in the x-ray magnetic circular dichroism spectrum of Pr [14]. We believe, therefore, that the weak peak at 5959 eV is in all probability a 2p H 4fquadrupolar excitation, thus confirming directly the existence of magnetic ordering of the Pr 4fmoments.…”

Section: Resultssupporting

confidence: 81%

Incommensurate magnetism in non-superconducting PrBa{sub 2}Cu{sub 3}O{sub 6.92}

Boothroyd¹,

Hill²,

McMorrow³

et al. 1998

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We report the discovery of incommensurate magnetic order in non-superconducting single crystals PrBa2Cu306.92. Resonant x-ray magnetic scattering at the Pr LIr and LIrI edges and high resolution neutron diffraction were used to characterise the magnetic order on the different magnetic sublattices. The data reveal that the Pr sublattice orders at a temperature of 19 K in. an incommensurate structure with ordering wavevector (0.5+6, 0.5, 0) or (0.5, 0.5+6,0), 6 = 0.006-0.008. A spin reorientation in the Pr sublattice to a commensurate antiferromagnetic structure with ordering wavevector (0.5,0.5,0.5) takes place at a temperature close to 9 K.

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“…Resonant inelastic x-ray scattering (RIXS) assigns the E1 or E2 nature from their relative energy positions [5,6]. In x-ray magnetic circular dichroism (XMCD) assignment is achieved by modelling variations in signal with the angle between the incident x-ray polarisation and the magnetisation direction [12].…”

mentioning

confidence: 99%

Dipolar Excitations at theLIIIX-Ray Absorption Edges of the Heavy Rare-Earth Metals

et al. 2007

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We report measured dipolar asymmetry ratios at the L III edges of the heavy rare earth metals. The results are compared with a first principles calculation and excellent agreement is found. A simple model of the scattering is developed, enabling us to re-interpret the resonant x-ray scattering in these materials and to identify the peaks in the asymmetry ratios with features in the spin and orbital moment densities.The interpretation of magnetic x-ray spectroscopies at the L absorption edges of rare earth materials has been a subject of long standing controversy. Spectra consist of two main features: a large peak at an energy close to the absorption white-line (feature A), interpreted as arising from dipolar (E1) transitions coupling 2p core levels to unoccupied 5d and 6s states; a smaller peak a few eV lower (feature B), attributed to quadrupolar (E2) transitions coupling the same core levels to unoccupied 4f states [1][2][3][4][5][6]. In this paper we reexamine the dipolar/quadrupolar character of these structures.X-ray resonant magnetic scattering (XRMS) assigns the E1 or E2 nature of spectral features through analysis of the scattered x-ray polarisation [7,8] and comparison with theory [9][10][11]. Resonant inelastic x-ray scattering (RIXS) assigns the E1 or E2 nature from their relative energy positions [5,6]. In x-ray magnetic circular dichroism (XMCD) assignment is achieved by modelling variations in signal with the angle between the incident x-ray polarisation and the magnetisation direction [12]. However, problems arise in the sign of signals and the relative importance of E2 'contamination'. Spectra show dispersive shapes which are thought to arise from exchange splitting and matrix element effects [13,14].In this letter we report combined experimental and theoretical investigations of x-ray resonant interference scattering (XRIS) in the ferro/ferrimagnetic phases of heavy rare earths. For the heavy rare earth hexagonal crystal structures, E1-E2/M1 scattering is allowed and may contribute to asymmetry ratios. We exploit the possibility of virtually turning off the E2 signal by scattering horizontally through angles close to 90°, thus isolating E1 scattering. To investigate this further, first principles calculations were performed for both pure E1, pure E2, and total (E1 and E2) scattering in this geometry. The E1-E2 contributions were found to be two orders of magnitude smaller than the pure E1 scattering and thus can be eliminated as key contributions. We show that feature B is in fact of mixed E1

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Identification of Quadrupolar Excitation Channels at theL3Edge of Rare-Earth Compounds

Cited by 71 publications

References 26 publications

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
Self Cite
21
2
14
0
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Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
Self Cite
21
2
14
0
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Incommensurate magnetism in non-superconducting PrBa{sub 2}Cu{sub 3}O{sub 6.92}

Dipolar Excitations at theLIIIX-Ray Absorption Edges of the Heavy Rare-Earth Metals

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Identification of Quadrupolar Excitation Channels at theL3Edge of Rare-Earth Compounds

Cited by 71 publications

References 26 publications

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(LnBadía-Romano1, Bartolomé2, Bartolomé3 et al. 2013Phys. Rev. BSelf Cite212140View full textAdd to dashboardCite

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(LnBadía-Romano1, Bartolomé2, Bartolomé3 et al. 2013Phys. Rev. BSelf Cite212140View full textAdd to dashboardCite

Incommensurate magnetism in non-superconducting PrBa{sub 2}Cu{sub 3}O{sub 6.92}

Dipolar Excitations at theLIIIX-Ray Absorption Edges of the Heavy Rare-Earth Metals

Contact Info

Product

Resources

About

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
Self Cite
21
2
14
0
View full text Add to dashboard Cite

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
Self Cite
21
2
14
0
View full text Add to dashboard Cite