X-Ray Resonance Exchange Scattering

Hannon, J. P.; Trammell, G. T.; Blume, M.; Gibbs, Doon

doi:10.1103/physrevlett.61.1245

Cited by 785 publications

(537 citation statements)

References 9 publications

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“…Such a shift is evidence that the resonance originates from dipole transitions between the core 2p and the partially filled 5d states. 22,24 Similar resonant magnetic scattering is observed in energy scan through the Ce L II edge for fixed Q at (103) reflection (not shown here) and also in the energy dependence of the integrated intensity of (103) peak at 2.4 K as shown in the Fig. 7(a), confirming that both (103) and (104) are Ce-specific magnetic reflections.…”

Section: Ce L Ii Rxms Measurementssupporting

confidence: 68%

Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO

Zhang

Kim

et al. 2013

Phys. Rev. B

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Neutron and synchrotron resonant x-ray magnetic scattering (RXMS) complemented by heat capacity and resistivity measurements reveal the evolution of the magnetic structures of Fe and Ce sublattices in a CeFeAsO single crystal. The RXMS of magnetic reflections at the Ce L-II edge shows a magnetic transition that is specific to the Ce antiferromagnetic long-range ordering at T-Ce approximate to 4 K with short-range Ce ordering above T-Ce, whereas neutron diffraction measurements of a few magnetic reflections indicate a transition at T* approximate to 12 K with an unusual order parameter. Detailed order-parameter measurements on several magnetic reflections by neutrons show a weak anomaly at 4 K that we associate with the Ce ordering. The successive transitions at T-Ce and T* can also be clearly identified by two anomalies in heat capacity and resistivity measurements. The higher transition temperature at T* approximate to 12 K is mainly ascribed to Fe spin reorientation transition, below which Fe spins rotate uniformly and gradually in the ab plane. The Fe spin reorientation transition and short-range Ce ordering above T-Ce reflect the strong FeCe couplings prior to long-range ordering of the Ce. The evolution of the intricate magnetic structures in CeFeAsO going through T* and T-Ce is proposed. Neutron and synchrotron resonant x-ray magnetic scattering (RXMS) complemented by heat capacity and resistivity measurements reveal the evolution of the magnetic structures of Fe and Ce sublattices in a CeFeAsO single crystal. The RXMS of magnetic reflections at the Ce L II edge shows a magnetic transition that is specific to the Ce antiferromagnetic long-range ordering at T Ce ≈ 4 K with short-range Ce ordering above T Ce , whereas neutron diffraction measurements of a few magnetic reflections indicate a transition at T * ≈ 12 K with an unusual order parameter. Detailed order-parameter measurements on several magnetic reflections by neutrons show a weak anomaly at 4 K that we associate with the Ce ordering. The successive transitions at T Ce and T * can also be clearly identified by two anomalies in heat capacity and resistivity measurements. The higher transition temperature at T * ≈ 12 K is mainly ascribed to Fe spin reorientation transition, below which Fe spins rotate uniformly and gradually in the ab plane. The Fe spin reorientation transition and short-range Ce ordering above T Ce reflect the strong Fe-Ce couplings prior to long-range ordering of the Ce. The evolution of the intricate magnetic structures in CeFeAsO going through T * and T Ce is proposed. Disciplines Condensed Matter Physics | Materials Science and Engineering | Metallurgy Comments

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Section: Ce L Ii Rxms Measurementssupporting

confidence: 68%

Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO

Zhang

Kim

et al. 2013

Phys. Rev. B

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“…Resonant x-ray diffraction occurs when a photon excites a core electron to empty states, and is subsequently reemitted when the electron and the core hole recombine. 46 anisotropic contributions to the x-ray susceptibility tensor, [49][50][51] the amplitude of which increases dramatically as the photon energy is tuned to an atomic absorption edge. In the presence of long-range magnetic order, or a spatially anisotropic electronic distribution, the interference of the anomalous scattering amplitudes may lead to Bragg peaks at positions forbidden by the crystallographic space group.…”

Section: Resultsmentioning

confidence: 99%

EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

et al. 2012

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We combine neutron powder diffraction and x-ray single-crystal magnetic diffraction at the Eu L 2 edge to scrutinize the magnetic motif of the Eu ions in magnetoelectric EuTiO 3 . Our measurements are consistent with an antiferromagnetic G-type pattern with the Eu magnetic moments ordering along the a,b -plane diagonal. Recent reports of a novel transition at 2.75 K with a flop of magnetic moments upon poling the sample in an electric field cannot be confirmed for a nonpoled sample. Our neutron diffraction data do not show any significant change of the structure below the Néel temperature. Magnetoelastic coupling, if present, is therefore expected to be negligible.

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“…The diffraction data were collected using photons with energies near the Cu L 3 absorption edge (2p 3/2 → 3d) which, as noted earlier, greatly enhances the sensitivity of the scattering signal to the lattice distortion induced by the charge ordering [25]. More specifically, the resonant signal from each material was maximized by choosing the energy corresponding to the peak intensity in the x-ray absorption spectrum (XAS).…”

Section: Methodsmentioning

confidence: 99%

Comparison of charge modulations in La1.875Ba0.125CuO4and YBa
Thampy
¹
,
Blanco-Canosa
²
,
García-Fernández
³

et al. 2013
Phys. Rev. B
41
5
49
0
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A charge modulation has recently been reported in (Y,Nd)Ba2Cu3O6+x [Ghiringhelli et al. Science 337, 821 (2013)]. Here we report Cu L3 edge soft x-ray scattering studies comparing the lattice modulation associated with the charge modulation in YBa2Cu3O6.6 with that associated with the well known charge and spin stripe order in La1.875Ba0.125CuO4. We find that the correlation length in the CuO2 plane is isotropic in both cases, and is 259 ± 9Å for La1.875Ba0.125CuO4 and 55 ± 15Å for YBa2Cu3O6.6. Assuming weak inter-planar correlations of the charge ordering in both compounds, we conclude that the order parameters of the lattice modulations in La1.875Ba0.125CuO4 and YBa2Cu3O6.6 are of the same order of magnitude.

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X-Ray Resonance Exchange Scattering

Cited by 785 publications

References 9 publications

Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO

Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO

EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

Comparison of charge modulations in La1.875Ba0.125CuO4and YBa
Thampy
¹
,
Blanco-Canosa
²
,
García-Fernández
³

et al. 2013
Phys. Rev. B
41
5
49
0
View full text Add to dashboard Cite

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X-Ray Resonance Exchange Scattering

Cited by 785 publications

References 9 publications

Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO

Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO

EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

Comparison of charge modulations in La1.875Ba0.125CuO4and YBaThampy1, Blanco-Canosa2, García-Fernández3 et al. 2013Phys. Rev. B415490View full textAdd to dashboardCite

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Comparison of charge modulations in La1.875Ba0.125CuO4and YBa
Thampy
¹
,
Blanco-Canosa
²
,
García-Fernández
³

et al. 2013
Phys. Rev. B
41
5
49
0
View full text Add to dashboard Cite