Dynamics of ${ }^3$He Impurities in Solid ${ }^4$He near the Apparent Supersolid Transition
ORAL
Abstract
We report measurements of the nuclear spin-spin and nuclear spin-lattice relaxation times for ${ }^3$He impurities in solid hcp ${ }^4$He for a molar volume of 21 cm$^3$. The ${ }^3$He concentrations range from 20 to 2000 ppm and the relaxation times were measured for temperatures 1.4 K$>$T$>$0.010 K. The results are discussed in terms of the dynamics of the ${ }^3$He impurities and their scattering by other impurities and by other defects. In addition we report new results for the phase separation of the ${ }^3$He from the ${ }^4$He and the formation of ${ }^3$He nanodroplets in the solid ${ }^4$He matrix.
*This research was carried out at the NHMFL High B/T Facility which is supported by NSF Grant DMR 0654118 and by the State of Florida. This project was supported in part by an award from the Collaborative Users Grant Program of the NHMFL.
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