Observation of non-classical rotational inertia in bulk solid 4He

Motoshi Kondo, Shunichi Takada, Yoshiyuki Shibayama, Keiya Shirahama

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

In recent torsional oscillator experiments by Kim and Chan (KC), a decrease of rotational inertia has been observed in solid 4He in porous materials (Kim, E., Chan, M.H.W. in Nature 427:225, 2004; J. Low Temp. Phys. 138:859, 2005) and in a bulk annular channel (Kim, E., Chan, M.H.W. in Science 305:1941, 2004). This observation strongly suggests the existence of "non-classical rotational inertia" (NCRI), i.e. superflow, in solid 4He. In order to study such a possible "supersolid" phase, we perform torsional oscillator experiments for cylindrical solid 4He samples. We have observed decreases in rotational inertia below 200 mK for two solid samples (pressures P = 4.1 and 3.0 MPa). The observed NCRI fraction at 70 mK is 0.14%, which is about 1/3 of the fraction observed in the annulus by KC. Our observation is the first experimental confirmation of the possible supersolid finding by KC.

Original languageEnglish
Pages (from-to)695-699
Number of pages5
JournalJournal of Low Temperature Physics
Volume148
Issue number5-6
DOIs
Publication statusPublished - 2007 Sep

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inertia
oscillators
annuli
porous materials
Porous materials
Experiments

Keywords

  • 67.80.-s

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Observation of non-classical rotational inertia in bulk solid 4He. / Kondo, Motoshi; Takada, Shunichi; Shibayama, Yoshiyuki; Shirahama, Keiya.

In: Journal of Low Temperature Physics, Vol. 148, No. 5-6, 09.2007, p. 695-699.

Research output: Contribution to journalArticle

Kondo, Motoshi ; Takada, Shunichi ; Shibayama, Yoshiyuki ; Shirahama, Keiya. / Observation of non-classical rotational inertia in bulk solid 4He. In: Journal of Low Temperature Physics. 2007 ; Vol. 148, No. 5-6. pp. 695-699.
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