Abstract
We compare the properties of vacancies in4He implied by X-ray, NMR, and acoustic measurements with specific heat, pressure, and melting curve data. Taken together, these different measurements indicate that the model of vacancies as occupying a narrow band of states cannot be correct. Better agreement can be obtained by assuming that vacancies occupy a wide band but inconsistencies remain. An unambiguous determination of the properties of vacancies requires additional experimental and theoretical work.
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Burns, C.A., Goodkind, J.M. Vacancies in solid4He: Conflicting experimental evidence. J Low Temp Phys 95, 695–714 (1994). https://doi.org/10.1007/BF00754711
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DOI: https://doi.org/10.1007/BF00754711