A cryostat designed for x-ray fluorescence holography experiments down to 4 K

Area of Science:

• Materials Science
• Condensed Matter Physics
• X-ray Spectroscopy

Background:

• Functional materials exhibit critical transitions at low temperatures (down to 4 K).
• X-ray fluorescence holography (XFH) requires precise sample angle control for measurements.
• Existing equipment may not be optimized for low-temperature XFH experiments.

Purpose of the Study:

• To design and implement a specialized cryostat for low-temperature XFH experiments.
• To enable the study of characteristic material transitions at cryogenic temperatures.
• To optimize the cryostat for synchrotron experimental constraints.

Main Methods:

• Development of a cryostat capable of reaching 4 K.
• Integration of a piezoelectric motor for azimuthal angle (ϕ) control.
• Utilizing cryostat rotation via a stepping motor for incident angle (θ) control.
• Optimization of heat load and cryostat mass for synchrotron beamline compatibility.

Main Results:

• Successful design and implementation of a low-temperature cryostat for XFH.
• Demonstrated feasibility of XFH measurements at temperatures as low as 4 K.
• Presented XFH data from a Pb crystal and YbInCu₄ at low temperatures.

Conclusions:

• The developed low-temperature cryostat is suitable for XFH experiments.
• This equipment allows investigation of low-temperature phenomena in functional materials.
• The system's design addresses practical constraints of synchrotron-based research.