Electronic properties of crystalline materials observed in X-ray diffraction

Lovesey, S. W.; Balcar, Ewald; Knight, Kevin S.; Rodríguez, Jesús Daniel Santos

doi:10.1016/j.physrep.2005.01.003

Cited by 199 publications

(384 citation statements)

References 69 publications

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“…However, our simulations for the monoclinic phase 21 using the charge transfer (configuration interaction) multiplet approach 22 are consistent with the prediction of an estimated charge valence difference of ~0.45. 6 Calculated spectra were fitted to the experimental magnetic scattering and, as an additional constraint, we requested an agreement with the absorption spectrum in the insulating phase of rare earth RENiO 3 compounds.…”

supporting

confidence: 85%

Role of magnetic and orbital ordering at the metal-insulator transition inNdNiO3

et al. 2006

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Soft x-ray resonant scattering at the Ni L 2,3 edges is used to test models of magnetic-and orbital-ordering below the metal-insulator transition in NdNiO 3 . The large branching ratio of the L 3 to L 2 intensities of the (1/2 0 1/2) reflection and the observed azimuthal angle and polarization dependence originates form a non-collinear magnetic structure. The absence of an orbital signal and the non-collinear magnetic structure show that the nickelates are materials for which orbital ordering is absent at the metal-insulator transition.

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confidence: 85%

Role of magnetic and orbital ordering at the metal-insulator transition inNdNiO3

et al. 2006

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“…Since E is symmetrically equivalent to the position vector r, it is also equivalently stated that there is a finite toroidal moment r × µ, a parity-odd rank-1 tensor, at the Gd sites. 24,25) The structure factor for the toroidal moment in the present case can therefore be represented by n,j (E n × µ n,j )e −iQ·(rj +dn) . This is finite at the same q vector as the magnetic cycloid; note that it is not ferrotoroidic.…”

Section: Local Noncentrosymmetry and Toroidal Momentmentioning

confidence: 99%

Temperature-Dependent Cycloidal Magnetic Structure in GdRu₂Al₁₀Studied by Resonant X-ray Diffraction

et al. 2017

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We have performed resonant X-ray diffraction experiments on the antiferromagnet GdRu2Al10 and have clarified that the magnetic structure in the ordered state is cycloidal with the moments lying in the bc plane and propagating along the b axis. The propagation vector shows a similar temperature dependence to the magnetic order parameter, which can be interpreted as being associated with the gap opening in the conduction band and the resultant change in the magnetic exchange interaction. Although the S = 7/2 state of Gd is almost isotropic, the moments show slight preferential ordering along the b axis. The c axis component in the cycloid develops with decreasing temperature through a tiny transition in the ordered phase. We also show that the scattering involves the σ-σ ′ process, which is forbidden in normal E1-E1 resonance of magnetic dipole origin. We discuss the possibility of the E1-E2 resonance originating from a toroidal moment due to the lack of inversion symmetry at the Gd site. The spin-flop transition in a magnetic field is also described in detail.

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“…where Y K Q are real spherical harmonics (also referred to as multipoles or spherical tensors) of rank K and projection Q (Lovesey et al, 2005), and T K Q ðpÞ are the corresponding tensor components and are functions of p. The merit of such an expansion lies in the fact that each non-vanishing multipole Y K Q must be consistent with the symmetry of the physical system. For example, an isotropic system allows only a single term in the expansion and we find…”

Section: Momentum Density and Rotational Propertiesmentioning

confidence: 99%

On the possibility of using X-ray Compton scattering to study magnetoelectrical properties of crystals

et al. 2016

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This paper discusses the possibility of using Compton scattering -an inelastic X-ray scattering process that yields a projection of the electron momentum density -to probe magnetoelectrical properties. It is shown that an antisymmetric component of the momentum density is a unique fingerprint of such time-and parity-odd physics. It is argued that polar ferromagnets are ideal candidates to demonstrate this phenomenon and the first experimental results are shown, on a single-domain crystal of GaFeO 3 . The measured antisymmetric Compton profile is very small (' 10 À5 of the symmetric part) and of the same order of magnitude as the statistical errors. Relativistic first-principles simulations of the antisymmetric Compton profile are presented and it is shown that, while the effect is indeed predicted by theory, and scales with the size of the valence spin-orbit interaction, its magnitude is significantly overestimated. The paper outlines some important constraints on the properties of the antisymmetric Compton profile arising from the underlying crystallographic symmetry of the sample.

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Electronic properties of crystalline materials observed in X-ray diffraction

Cited by 199 publications

References 69 publications

Role of magnetic and orbital ordering at the metal-insulator transition inNdNiO3

Role of magnetic and orbital ordering at the metal-insulator transition inNdNiO3

Temperature-Dependent Cycloidal Magnetic Structure in GdRu₂Al₁₀Studied by Resonant X-ray Diffraction

On the possibility of using X-ray Compton scattering to study magnetoelectrical properties of crystals

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Electronic properties of crystalline materials observed in X-ray diffraction

Cited by 199 publications

References 69 publications

Role of magnetic and orbital ordering at the metal-insulator transition inNdNiO3

Role of magnetic and orbital ordering at the metal-insulator transition inNdNiO3

Temperature-Dependent Cycloidal Magnetic Structure in GdRu2Al10Studied by Resonant X-ray Diffraction

On the possibility of using X-ray Compton scattering to study magnetoelectrical properties of crystals

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Temperature-Dependent Cycloidal Magnetic Structure in GdRu₂Al₁₀Studied by Resonant X-ray Diffraction