Torsional oscillator and synchrotron x-ray experiments on solid {sup 4}He in aerogel.

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Phys. Rev. Lett.

DOI:https://doi.org/10.1103/PhysRevLett.101.165303· OSTI ID:951053

Mulders, N; West, J T; Chan, M H. W.; Kodituwakku, C N; Burns, C A; Lurio, L B

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 {approx}3 x 10{sup -4}, and the onset temperature is {approx}100 mK.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 951053
• Report Number(s): ANL/XSD/JA-63718; PRLTAO; TRN: US0902118
• Journal Information: Phys. Rev. Lett., Vol. 101, Issue 2008; ISSN 0031-9007
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
CRYSTAL STRUCTURE
OSCILLATORS
SYNCHROTRONS
X-RAY DIFFRACTION