Resonant Ultrasound Spectroscopy for Irregularly Shaped Samples and Its Application to Uranium Ditelluride

Area of Science:

• Materials Science
• Condensed Matter Physics
• Acoustics

Background:

• Resonant ultrasound spectroscopy (RUS) is a key method for determining a material's elastic tensor.
• Traditional RUS is limited to regularly shaped samples like spheres and cylinders.
• Analyzing irregularly shaped materials with RUS has been a significant challenge.

Purpose of the Study:

• To develop and validate a novel RUS methodology for characterizing the elastic properties of irregularly shaped samples.
• To expand the application scope of RUS to a broader range of materials.
• To determine the elastic tensor of the unconventional superconductor UTe2.

Main Methods:

• Developed a new computational approach to adapt RUS for non-standard sample geometries.
• Applied the enhanced RUS technique to a sample of UTe2.
• Measured resonant frequencies at varying temperatures.

Main Results:

• Successfully determined the full elastic tensor for irregularly shaped samples.
• Provided the complete elastic tensor for UTe2 at 300 K and 4 K.
• Demonstrated the expanded capability of RUS for complex material geometries.

Conclusions:

• The new RUS method significantly broadens the applicability of elastic tensor measurements.
• This advancement enables the study of complex or difficult-to-shape materials.
• The elastic tensor data for UTe2 provides crucial insights into its superconducting properties.