High-pressure system for Compton scattering experiments.

Area of Science:

• Condensed Matter Physics
• Materials Science
• High-Pressure Science

Background:

• Understanding electron momentum distribution in metals is crucial for predicting material properties.
• Previous high-pressure studies were limited by experimental complexity and time.

Purpose of the Study:

• To develop and validate a novel high-pressure apparatus for Compton scattering experiments.
• To investigate the pressure-induced changes in the electronic structure of metallic lithium.

Main Methods:

• Development of a specialized high-pressure apparatus for Compton scattering.
• Utilizing synchrotron radiation for efficient data acquisition.
• Experimental observation of the Compton profile of metallic lithium under varying pressures.

Main Results:

• The developed apparatus allows for rapid data collection, obtaining Compton profiles within hours.
• The pressure dependence of the Fermi momentum in metallic lithium was successfully measured.
• Experimental results align well with predictions from the free-electron model.

Conclusions:

• The novel high-pressure apparatus is effective for studying electron momentum distributions.
• The free-electron model provides a valid approximation for the electronic behavior of lithium under pressure.
• This technique opens new avenues for high-pressure electronic structure studies in metals and alloys.