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The Annealing Process in Solid 4He

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Abstract

We have used a torsional oscillator with square cross section and a resonance frequency of 185 Hz to confirm the nonclassical rotational inertia (NCRI) discovered by Kim and Chan (Nature 427:225, 2004; Science 305:1941, 2004). We have also found a strong correlation between the NCRI signal and a high dissipation Q −1 of 4×10−6 of the oscillation above the transition temperature. Here, we present preliminary results of the annealing process in 4He at a pressure of 26 bar. When holding the temperature constant above 1 K we have observed a immediate rise in the period and a slow decay of the dissipation. The equilibrium value of Q −1 decreases with increasing temperature.

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Authors and Affiliations

  1. Laboratory of Atomic and Solid State Physics and the Cornell Center for Materials Research, Cornell University, Ithaca, NY, 14853-2501, USA

    Ann Sophie C. Rittner & John D. Reppy

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  1. Ann Sophie C. Rittner
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  2. John D. Reppy
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Correspondence to Ann Sophie C. Rittner.

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Rittner, A.S.C., Reppy, J.D. The Annealing Process in Solid 4He. J Low Temp Phys 148, 671–675 (2007). https://doi.org/10.1007/s10909-007-9447-1

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  • DOI: https://doi.org/10.1007/s10909-007-9447-1

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