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Dynamical Effects in Resonant X-Ray Diffraction.

S Macke^1,2, J E Hamann-Borrero³, R J Green^1,4

¹Quantum Matter Institute, Physics and Astronomy Department, The Brimacombe Building, 2355 East Mall, Vancouver V6T 1Z4, Canada.

Physical Review Letters

|September 24, 2016

Summary

This summary is machine-generated.

Dynamical diffraction effects significantly alter resonant scattering in LaNiO3 superlattices. These effects, including extinction and refraction, change how researchers interpret magnetic and orbital structures using resonant x-ray diffraction.

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Area of Science:

Condensed Matter Physics
Materials Science
Solid-State Chemistry

Background:

Resonant X-ray diffraction is a key technique for probing electronic and magnetic structures in materials.
The standard kinematic approximation in resonant X-ray diffraction may not fully capture complex scattering phenomena.
Lanthanum nickelate (LaNiO3) superlattices exhibit complex electronic and magnetic ordering relevant to advanced materials.

Purpose of the Study:

To investigate the impact of dynamical diffraction effects on resonant magnetic diffraction.
To analyze how extinction and refraction modify the scattering cross-section in LaNiO3 superlattices.
To develop a theoretical framework for understanding these dynamical effects in resonant X-ray scattering.

Main Methods:

Utilized resonant magnetic diffraction at the Nickel (Ni) L2,3 edge.
Studied a LaNiO3 superlattice.
Numerically solved Maxwell's equations in three dimensions for a comprehensive theoretical description.

Main Results:

Dynamical diffraction effects were shown to significantly modify the resonant scattering cross-section.
Extinction and refraction were identified as key factors converting intensity maxima to minima.
The azimuthal-angle dependence of diffracted intensity, crucial for structural determination, is altered by these effects.

Conclusions:

The standard kinematic approximation is insufficient for accurately describing resonant scattering in certain systems.
A comprehensive theoretical model of dynamical diffraction is essential for precise interpretation of resonant X-ray diffraction data.
Understanding dynamical diffraction enhances the utility of resonant X-ray scattering for studying electronic ordering in solids.