Investigation of ultrasound propagation in impurity-helium solids Academic Article

abstract

• The velocity and attenuation of ultrasound passing through porous impurity-helium solids immersed in liquid 4He have been measured in the temperature range 1.2-2.3 K. These solids were formed by injecting a mixture of impurity (Ne or N2) and helium gases into superfluid 4He. We found that the speed of sound at low temperatures is close to that of first sound in bulk helium but decreases more rapidly with increasing temperature, similar to behavior observed in aerogel. The attenuation of sound in helium in the impurity-helium solids is bigger than in bulk helium and increases rapidly with temperature up to 1.8 K, after which a crossover to a much weaker temperature dependence was observed. 2000 Elsevier Science B.V. All rights reserved.

authors

• Khmelenko, Vladimir
• Lee, David

published proceedings

• PHYSICA B

author list (cited authors)

• Kiselev, S. I., Khmelenko, V. V., Geller, D. A., Beamish, J. R., & Lee, D. M.

citation count

• 3

complete list of authors

• Kiselev, SI||Khmelenko, VV||Geller, DA||Beamish, JR||Lee, DM

publication date

• July 2000

publisher

• Elsevier  Publisher

published in

• Physica B: Condensed Matter  Journal

keywords

• He-4 Superfluid
• Impurity In He-4
• Impurity-helium Solid
• Ultra-sound

Digital Object Identifier (DOI)

• 10.1016/S0921-4526(99)02108-0

start page

• 105

end page

• 106

volume

• 284

issue

• PART I

URL

• http://dx.doi.org/10.1016/s0921-4526(99)02108-0