Non-Classical Response from Quench-Cooled Solid Helium Confined in Porous Gold

Details Non-Classical Response from Quench-Cooled Solid Helium Confined in Porous Gold Non-Classical Response from Quench-Cooled Solid Helium Confined in Porous Gold

2009-09-10

arxiv.org/abs/0909.1948v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

We have investigated the non-classical response of solid 4He confined in porous gold set to torsional oscillation. When solid helium is grown rapidly, nearly 7% of the solid helium appears to be decoupled from the oscillation below about 200 mK. Dissipation appears at temperatures where the decoupling shows maximum variation. In contrast, the decoupling is substantially reduced in slowly grown solid helium. The dynamic response of solid helium was also studied by imposing a sudden increase in the amplitude of oscillation. Extended relaxation in the resonant period shift, suggesting the emergence of the pinning of low energy excitations, was observed below the onset temperature of the non-classical response. The motion of a dislocation or a glassy solid is restricted in the entangled narrow pores and is not likely responsible for the period shift and long relaxation.

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