4He crystal quality and rotational response in a transparent torsional oscillator

A. D. Fefferman, X. Rojas, A. Haziot, S. Balibar, J. T. West, Moses Hung-Wai Chan

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We have studied natural purity 4He single crystals and polycrystals between 10 and 600 mK using a torsional oscillator with a 2 cm3 rigid cell made of sapphire with a smooth geometry. As the temperature was lowered, we observed sample-dependent but reproducible resonant frequency shifts that could be attributed to a supersolid fraction of order 0.1%. However, these shifts were observed with single crystals, not with polycrystals. Our results indicate that, in our case, the rotational anomaly of solid helium is more likely due to a change in stiffness than to supersolidity. This interpretation would presumably require gliding of dislocations in more directions than previously thought.

Original languageEnglish (US)
Article number094103
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number9
DOIs
StatePublished - Mar 13 2012

Fingerprint

Polycrystals
polycrystals
oscillators
Single crystals
gliding
Helium
Crystals
Aluminum Oxide
single crystals
Sapphire
frequency shift
crystals
resonant frequencies
Natural frequencies
stiffness
purity
sapphire
helium
Stiffness
anomalies

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Fefferman, A. D. ; Rojas, X. ; Haziot, A. ; Balibar, S. ; West, J. T. ; Chan, Moses Hung-Wai. / 4He crystal quality and rotational response in a transparent torsional oscillator. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 85, No. 9.
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4He crystal quality and rotational response in a transparent torsional oscillator. / Fefferman, A. D.; Rojas, X.; Haziot, A.; Balibar, S.; West, J. T.; Chan, Moses Hung-Wai.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 9, 094103, 13.03.2012.

Research output: Contribution to journalArticle

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