Versatile setup for optical spectroscopy under high pressure and low temperature.

Area of Science:

• Spectroscopy
• Materials Science
• Condensed Matter Physics

Background:

• Spectroscopic analysis under extreme conditions is crucial for understanding material properties.
• Existing setups often face limitations in pressure, temperature range, or spectral stability.

Purpose of the Study:

• To present a novel optical setup for infrared and Raman spectroscopic measurements.
• To enable in situ tuning of pressure up to 20 GPa and temperatures down to 13 K.
• To enhance spectral stability and data quality through vacuum operation and synchrotron source utilization.

Main Methods:

• Utilized a membrane-driven diamond anvil cell for pressure generation.
• Operated the setup in transmission and reflection modes.
• Employed a synchrotron source for enhanced infrared throughput.
• Implemented vacuum conditions to minimize water absorption.
• Adapted reflectivity analysis to incorporate ambient pressure data.

Main Results:

• Achieved in situ pressure tuning up to 20 GPa and temperature control down to 13 K.
• Demonstrated enhanced spectral stability and reduced water absorption features.
• Obtained quantitative optical conductivity curves through adapted reflectivity analysis.
• Showcased performance with various material examples.

Conclusions:

• The developed optical setup provides a robust platform for advanced spectroscopic studies under high pressure and low temperature.
• The system facilitates detailed investigation of material properties under extreme conditions.
• The methodology allows for direct comparison of results across different pressure regimes.