Torsional Oscillator and Synchrotron X-Ray Experiments on Solid [superscript 4]He in Aerogel

X-ray diffraction experiments show that solid {sup 4}He grown in aerogel is highly polycrystalline, with an hcp crystal structure (as in bulk) and a crystallite size of approximately 100 nm. In contrast to the expectation that the highly disordered solid will have a large supersolid fraction, torsio...

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Bibliographic Details
Published in:Physical review letters 2009-01, Vol.101 ((16) ; 10, 2008)
Main Authors: Mulders, N., West, J.T., Chan, M.H.W., Kodituwakku, C.N., Burns, C.A., Lurio, L.B.
Format: Article
Language:English
Subjects:
BEHAVIOR
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL STRUCTURE
CRYSTALS
HELIUM 4
IMPURITIES
MATERIALS SCIENCE
OSCILLATORS
PARTICLE ACCELERATORS
SIZE
SOLIDS
SYNCHROTRON RADIATION
TEMPERATURE RANGE 0065-0273 K
X-RAY DIFFRACTION
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Summary:X-ray diffraction experiments show that solid {sup 4}He grown in aerogel is highly polycrystalline, with an hcp crystal structure (as in bulk) and a crystallite size of approximately 100 nm. In contrast to the expectation that the highly disordered solid will have a large supersolid fraction, torsional oscillator measurements show a behavior that is strikingly similar to high purity crystals grown from the superfluid phase. The low temperature supersolid fraction is only -3 x 10{sup -4}, and the onset temperature is -100 mK.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.101.165303