1. Vacancies in solid4He: Conflicting experimental evidence
- Author
-
Clement Burns and John M. Goodkind
- Subjects
Classical theory ,Work (thermodynamics) ,Materials science ,Condensed matter physics ,Specific heat ,Activation energy ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Condensed Matter::Materials Science ,Narrow band ,Helium-4 ,Thermal conductivity ,Physics::Atomic and Molecular Clusters ,General Materials Science ,Wide band - 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.
- Published
- 1994