Dynamical Effects in Resonant X-Ray Diffraction.
Using resonant magnetic diffraction at the Ni L_{2,3} edge in a LaNiO_{3} superlattice, we show that dynamical effects beyond the standard kinematic approximation can drastically modify the resonant scattering cross section. In particular, the combination of extinction and refraction convert maxima to minima in the azimuthal-angle dependence of the diffracted intensity, which is commonly used to determine orbital and magnetic structures by resonant x-ray diffraction. We provide a comprehensive theoretical description of these effects by numerically solving Maxwell's equations in three dimensions. The understanding and description of dynamical diffraction enhances the capabilities of resonant x-ray scattering as a probe of electronic ordering phenomena in solids.
Quantum Matter Institute, Physics and Astronomy Department, The Brimacombe Building, 2355 East Mall, Vancouver V6T 1Z4, Canada.|Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.
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S
Macke
Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrae 20, 01069 Dresden, Germany.
J E
JE
Hamann-Borrero
Quantum Matter Institute, Physics and Astronomy Department, The Brimacombe Building, 2355 East Mall, Vancouver V6T 1Z4, Canada.|Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany.
R J
RJ
Green
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.
B
B
Keimer
Quantum Matter Institute, Physics and Astronomy Department, The Brimacombe Building, 2355 East Mall, Vancouver V6T 1Z4, Canada.
G A
GA
Sawatzky
Quantum Matter Institute, Physics and Astronomy Department, The Brimacombe Building, 2355 East Mall, Vancouver V6T 1Z4, Canada.|Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany.
M W
MW
Haverkort