Observation of rapid atomic motion in solid 3He-4He mixtures using NMR
Technion, Israel Institute of Technology -
Haifa, 32000, Israel
Accepted: 25 January 1996
We compared liquid and solid mixtures at coexistence using NMR imaging of the density of and of the T2 relaxation time in the two phases. We find that above 1 K, atoms in a bcc solid are more mobile than in the superfluid liquid. This rapid motion, induced by vacancies, takes place on a microscopic scale and can be explained in terms of -vacancy attraction of quantum origin. We relate our observations to similar effects observed in Sn-Pb alloys.
PACS: 67.80.Mg – Defects, impurities, and diffusion / 61.72.Ji – Point defects (vacancies, interstitials, color centers, etc.) and defect clusters / 67.80.-s – Solid helium and related quantum crystals
© EDP Sciences, 1996