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

Michaël K Tran1, Julien Levallois1, Ana Akrap1

  • 1Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland.

The Review of Scientific Instruments
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Summary
This summary is machine-generated.

We developed an advanced optical setup for infrared and Raman spectroscopy under extreme conditions. This system enables precise measurements at high pressures (up to 20 GPa) and low temperatures (down to 13 K) for materials science research.

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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.