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High-pressure developments for resonant X-ray scattering experiments at I16.

I Povedano1, A Bombardi2, D G Porter2

  • 1School of Engineering and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, UK.

Journal of Synchrotron Radiation
|March 11, 2020
PubMed
Summary

A new experimental setup enables high-pressure, low-temperature resonant X-ray scattering (RXS) experiments. This system, using a membrane-driven diamond anvil cell, allows in-situ pressure measurement and material probing across a wide temperature range.

Keywords:
DAChigh-pressureinstrumentation developmentlow temperatureresonant X-ray scattering

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • X-ray Scattering Techniques

Background:

  • High-pressure and low-temperature studies are crucial for understanding material properties.
  • Resonant X-ray Scattering (RXS) offers unique insights into electronic and magnetic structures.
  • Existing experimental setups may have limitations in achieving combined high pressure and low temperature.

Purpose of the Study:

  • To present a novel experimental setup for performing high-pressure resonant X-ray scattering (RXS) experiments at low temperatures.
  • To enable in-situ pressure measurement and material probing under extreme conditions.
  • To facilitate studies of materials at cryogenic temperatures (30-300 K) and high pressures (up to 20 GPa).

Main Methods:

  • Development of a membrane-driven diamond anvil cell (DAC) inspired by the Merrill-Bassett design.
  • Integration of a panoramic dome and optical system for in-situ ruby fluorescence pressure measurement.
  • Design for mounting on a 4 K closed-cycle cryostat, with low-temperature actuation via helium gas membrane.
  • Utilizing a CuBe alloy (BERYLCO 25) for key components, ensuring a compact size (20-21 mm height, 57 mm diameter).

Main Results:

  • Successful demonstration of a compact, integrated system for high-pressure, low-temperature RXS.
  • Capability to probe various materials within a temperature range of 30-300 K and pressures up to 20 GPa.
  • Preliminary experimental results validating the setup's performance under quasi-cryogenic conditions.

Conclusions:

  • The presented experimental setup is a valuable tool for advancing research in condensed matter physics and materials science.
  • It overcomes previous limitations by enabling simultaneous high-pressure and low-temperature RXS measurements.
  • The system's design facilitates detailed investigation of material behavior under extreme conditions.