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Observation of Non-Classical Rotational Inertia in Bulk Solid 4He

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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.

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Authors and Affiliations

  1. Department of Physics, Keio University, Yokohama, 223-8522, Japan

    Motoshi Kondo, Shunichi Takada, Yoshiyuki Shibayama & Keiya Shirahama

Authors
  1. Motoshi Kondo
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  2. Shunichi Takada
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  3. Yoshiyuki Shibayama
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  4. Keiya Shirahama
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Correspondence to Motoshi Kondo.

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Kondo, M., Takada, S., Shibayama, Y. et al. Observation of Non-Classical Rotational Inertia in Bulk Solid 4He. J Low Temp Phys 148, 695–699 (2007). https://doi.org/10.1007/s10909-007-9471-1

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  • DOI: https://doi.org/10.1007/s10909-007-9471-1

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