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Supersolid behavior in confined geometry.

J T West¹, X Lin, Z G Cheng

¹Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Physical Review Letters

|June 13, 2009

Summary

Measurements on solid helium-4 (4He) in thin disks revealed minimal nonclassical rotational inertia, differing from prior studies. This suggests bulk-like behavior in confined solid helium-4, challenging previous findings.

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Area of Science:

Condensed matter physics
Quantum fluids

Background:

Solid helium-4 exhibits unique quantum properties, including nonclassical rotational inertia (NCRI).
Previous studies suggested confinement significantly alters helium-4's properties, with Rittner and Reppy reporting 20% NCRI in thin geometries.

Purpose of the Study:

To investigate the impact of geometric confinement on solid helium-4's properties.
To measure the nonclassical rotational inertia and heat capacity of solid helium-4 in thin cylindrical disks.

Main Methods:

Torsional oscillator measurements were performed on solid helium-4 samples confined to thin (150 microm) cylindrical disks.
Heat capacity measurements were conducted on the same confined solid helium-4 samples.

Main Results:

Observed nonclassical rotational inertia was 0.9%, consistent with bulk solid helium-4 and samples in porous media.
The heat capacity peak in the confined geometry matched that of bulk solid samples with high crystalline quality.

Conclusions:

Geometric confinement to thin disks does not significantly reduce nonclassical rotational inertia in solid helium-4.
Solid helium-4 in this confined geometry exhibits bulk-like quantum behavior and high crystalline quality.