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Related Experiment Video

Updated: Oct 21, 2025

$Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene$

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Published on: August 22, 2017

Helicity-dependent resonant X-ray scattering in CuB₂O₄.

E N Ovchinnikova¹, A Rogalev², F Wilhelm²

¹Physics Department, Moscow State University, Moscow 119899, Russia.

Journal of Synchrotron Radiation

|September 3, 2021

Summary

This summary is machine-generated.

Circular dichroism in X-ray diffraction reveals new insights into forbidden Bragg reflections in non-centrosymmetric crystals. This study observed helicity-dependent resonant diffraction in copper metaborate, highlighting Cu atom contributions.

Keywords:

X-ray absorption X-ray natural circular dichroism resonant X-ray scattering

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Area of Science:

Condensed matter physics
Materials science
Crystallography

Background:

Forbidden Bragg reflections offer unique crystallographic information.
X-ray circular dichroism (XCD) can probe element-specific magnetic and electronic properties.
Studying non-centrosymmetric crystals is crucial for understanding phenomena like ferroelectricity and piezoelectricity.

Purpose of the Study:

To explore the potential of X-ray circular polarized beams for studying forbidden Bragg reflections.
To investigate helicity-dependent resonant diffraction in the non-centrosymmetric copper metaborate (CuB2O4) single crystal.
To determine the origin of circular dichroism in forbidden reflections at the Cu K-edge.

Main Methods:

Utilizing X-ray circular polarized beams for diffraction experiments.
Analyzing forbidden Bragg reflections in CuB2O4.
Resonant diffraction measurements near the Copper K-edge.

Main Results:

Observed significant circular dichroism in hh0 forbidden reflections.
Demonstrated that the intensity difference between right- and left-circular polarizations is dependent on helicity.
Attributed the observed circular dichroism to dipolar transitions involving Cu atoms at the 8(d) Wyckoff position.

Conclusions:

X-ray circular dichroism is a powerful tool for investigating forbidden reflections in non-centrosymmetric crystals.
The study provides new insights into the electronic structure and atomic contributions to resonant diffraction in CuB2O4.
This technique can be extended to study other non-centrosymmetric materials with potential applications in advanced electronic devices.