Summary
This study focuses on resonance ultrasound Spectroscopy and low-temperature ultrasonic attenuation measurements in both filled and unfilled skutterudites and Ge-clathrates.
The research uncovers distinctive elastic properties in filled skutterudites that complement their thermal behavior, along with the presence of low-energy vibrational modes.
In the case of single-crystalline Ge-clathrates, the low-temperature ultrasonic attenuation displays a glass-like nature and can be explained using the Tunneling Model, which is commonly used to describe the properties of amorphous solids.
