Possible existence of bound state Frenkel vacancies in solid 3He

The effects on the low temperature (T ? 15 mK) magnetic and thermal properties of solid ³He due to the presence of bound state Frenkel vacancies (BFV) are analyzed. The coupling of a ³He to a BFV contributes to the zero point motion of the ³He. Assuming that the BFV are strongly interacting and propagate coherently through the crystal, we find good qualitative agreement with $\text{both}$ the specific heat and magnetic susceptibility data.