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Investigation of ultrasound attenuation in impurity-helium solids containing liquid helium

The attenuation of ultrasound in Impurity-Helium (Im-He) solids created upon introduction of impurity atoms or molecules (D2, N2, Kr) into a volume of superfluid helium has been investigated. The observed features of attenuation show that a porous substance consisting of a loosely interconnected con... Full description

Published: New York, Kluwer Academic/Plenum Publishers, 2000
Kongresse: International Symposium on Quantum Fluids and Solids 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
QFS 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
International Symposium on Quantum Fluids and Solids 2000.06.06-2000.06.11 Minneapolis, MN, US
QFS 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
Contained in: Journal of Low Temperature Physics Vol. 121, No. 5-6 (2000), p. 671-676
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ISSN: 0022-2291
Additional Keywords: BEGLEITELEMENTEINFLUSS
ERSTARREN
FESTKOERPERPHYSIK
FLUESSIGHELIUM
PORENGROESSE
POROESER-WERKSTOFF
SCHALLDAEMPFUNG
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 6 Seiten, 8 Quellen
PPN (Catalogue-ID): WTI038053799
Note: WTI TEMA DB
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520 |a The attenuation of ultrasound in Impurity-Helium (Im-He) solids created upon introduction of impurity atoms or molecules (D2, N2, Kr) into a volume of superfluid helium has been investigated. The observed features of attenuation show that a porous substance consisting of a loosely interconnected continuous network is created in superfluid helium. This network is formed by impurity particles encapsulated in solidified helium. Analysis of attenuation allows us to conclude that Im-He solid samples have a wide distribution of pores from 8 nm to 800 nm. It was established that the character of attenuation in D2-He samples is considerably different from that in heavier Im-He solids, for which two maxima of attenuation were sometimes observed. A sharp peak was observed at Tc0 very close to the bulk helium lambda transition temperature and a second broad peak occurred at Tc<Tc0. This behavior is similar to that predicted theoretically for liquid helium in restricted fractal porous media. 
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