Abstract
Low-temperature ultrasonic attenuation and resonant ultrasound spectroscopy (RUS) data are reported on single crystals of the semiconductor Sr 8Ga 16Ge 30. The attenuation shows a strikingly glasslike behavior, implying that the elastic properties of the clathrate crystal at low temperatures ( T<1 K) are dominated by the presence of tunneling states. At slightly higher temperatures, the RUS data reflect the presence of a 2-level system with an energy-spacing of 45 K. The origin of these low-energy excitations is found in the ‘rattling’ Sr-atom, which occupies a fourfold split site in the clathrate structure.
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