New applications for the world's smallest high-precision capacitance dilatometer and its stress-implementing...

Area of Science:

• Materials Science
• Condensed Matter Physics
• Experimental Physics

Background:

• Miniature capacitance dilatometers are crucial for precise measurements of material properties.
• Existing devices have limitations in measuring properties under applied stress and at ultra-low temperatures.
• Previous setups struggled with in-situ sample manipulation and measurements in limited sample spaces.

Purpose of the Study:

• To introduce a novel miniature stress dilatometer with identical dimensions and mass to existing state-of-the-art devices.
• To enable high-resolution measurements of thermal expansion and magnetostriction under varying stress conditions.
• To demonstrate new experimental capabilities for dilatometry at ultra-low temperatures and with in-situ sample rotation.

Main Methods:

• Development of a new miniature dilatometer by replacing a single component of an existing device.
• Integration of the new dilatometer into a cryogen-free system (PPMS DynaCool) with in-situ sample rotation capabilities (-90° to +90°).
• Installation of the dilatometer in a dilution refrigerator insert of a PPMS DynaCool for measurements down to 0.06 K.

Main Results:

• The new stress dilatometer maintains the same compact size (15x14x15 mm³, 12 g) as the smallest capacitance dilatometer.
• Achieved high-resolution measurements of thermal expansion and magnetostriction with and without applied stress.
• Demonstrated successful operation in a cryogen-free system with sample rotation and in a dilution refrigerator at ultra-low temperatures.
• Resolved length changes as small as 0.01 Å in both novel applications.

Conclusions:

• The developed interchangeable body allows for a versatile miniature dilatometer capable of stress-dependent measurements.
• The new experimental setups significantly expand the accessible temperature range and manipulation capabilities for dilatometry.
• These advancements pave the way for new investigations into material properties under extreme conditions.