Montel mirror based collimating analyzer system for high-pressure resonant inelastic X-ray scattering experiments.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spectroscopy

Background:

• Resonant inelastic X-ray scattering (RIXS) is a powerful technique for studying highly correlated electron systems.
• Measuring low-energy magnetic excitations in materials under high pressure presents challenges due to extrinsic scattering.
• Existing RIXS methods struggle to isolate sample signals from diamond anvil cells (DACs) and pressure media.

Purpose of the Study:

• To develop a RIXS analyzer system capable of overcoming extrinsic scattering in DAC experiments.
• To achieve clear, low-energy excitation spectra from correlated iridates under high pressure.
• To improve the study of novel magnetic phases in extreme conditions.

Main Methods:

• Design and construction of a scattered X-ray collimation-based analyzer system for RIXS.
• Operation at the Ir L3-absorption edge with medium energy resolution (approximately 100 meV).
• Utilized a confocal analyzer design to reject unwanted scattering from the DAC environment.

Main Results:

• The new RIXS analyzer system successfully rejected extrinsic scattering from the DAC components (pressure media, gasket, diamonds).
• A clean low-energy excitation spectrum was obtained for the iridate Sr2IrO4 sample within a DAC.
• Demonstrated the capability to resolve subtle magnetic excitations previously obscured by background noise.

Conclusions:

• The developed RIXS analyzer system significantly enhances the ability to study low-energy magnetic excitations in high-pressure experiments.
• This advancement opens new avenues for discovering and characterizing novel magnetic phases in correlated materials.
• The study provides a robust method for obtaining high-quality RIXS spectra from challenging sample environments.