Probing jump diffusion in crystalline solids with neutron spin-echo spectroscopy

Area of Science:

• Condensed Matter Physics
• Materials Science

Background:

• Atomic diffusion in crystalline solids is crucial for material properties.
• Understanding diffusion mechanisms, like jump diffusion, is essential for material design.
• Traditional methods like quasielastic neutron scattering have limitations in resolving fast and slow diffusion.

Purpose of the Study:

• To apply neutron spin-echo spectroscopy to study jump diffusion in crystalline solids.
• To highlight the advantages of neutron spin-echo spectroscopy over quasielastic neutron scattering.
• To demonstrate the method's potential using nickel diffusion in NiGa.

Main Methods:

• Neutron spin-echo spectroscopy was employed.
• The technique was applied to investigate jump diffusion in a crystalline solid.
• Nickel diffusion in the intermetallic alloy NiGa served as a model system.

Main Results:

• Neutron spin-echo spectroscopy provides direct visual discrimination between fast and slow diffusion processes.
• The method offers high resolution in the time-energy domain, surpassing quasielastic neutron scattering.
• Successful application to Ni diffusion in NiGa demonstrated the technique's efficacy.

Conclusions:

• Neutron spin-echo spectroscopy is a powerful tool for studying atomic diffusion in solids.
• The technique offers significant advantages for characterizing complex diffusion behaviors.
• This method opens new avenues for investigating dynamic processes in materials.