Absolute attenuation and sound velocity can be measured through direct propagation of ultrasound pulses in a wide range of temperature and magnetic field from: 0.1mK to1K and up to 8T magnetic field.
Tone-burst RF pulses are applied to a transmitter transducer and a receiver transducer detects a subsequent signals traveled through the sample. For high attenuating material, we also offer an acoustic impedance measurement capability which is valuable in detecting transition signatures.
H. Takeuchi, et al., Knudsen-to-Hydrodynamic Crossover in Liquid 3He in a High-Porosity Aerogel, Phys. Rev. Lett. (2012) Read online.
B. H. Moon, et al., Frequency-dependent ultrasound attenuation in superfluid 3He in aerogel, Phys. Rev. B (2010) Read online.
. H. Moon, et. al., Ultrasound attenuation and a P-B-T phase diagram of superfluid 3He in 98% aerogel, Phys. Rev. (2010) Read online.
H. C. Choi, et. al., Ultrasound Attenuation of Superfluid 3He in Aerogel, Phys. Rev. Lett. (2007) Read online.
Last modified on 23 December 2022