Observation of rapid atomic motion in solid <sup>3</sup>He-<sup>4</sup>He mixtures using NMR
I. Schuster; Y. Swirsky; E. J. Schmidt; E. Polturak; S. G. Lipson; I. Schuster; Physics Department, Technion, Israel Institute of Technology - Haifa, 32000, Israel; Y. Swirsky; Physics Department, Technion, Israel Institute of Technology - Haifa, 32000, Israel; E. J. Schmidt; Physics Department, Technion, Israel Institute of Technology - Haifa, 32000, Israel; E. Polturak; Physics Department, Technion, Israel Institute of Technology - Haifa, 32000, Israel; S. G. Lipson; Physics Department, Technion, Israel Institute of Technology - Haifa, 32000, Israel
Журнал:
EPL (Europhysics Letters)
Дата:
1996-03-10
Аннотация:
We compared liquid and solid <sup>3</sup>He − <sup>4</sup>He mixtures at coexistence using NMR imaging of the density of <sup>3</sup>He and of the T<sub>2</sub> relaxation time in the two phases. We find that above 1 K, <sup>3</sup>He 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 <sup>3</sup>He-vacancy attraction of quantum origin. We relate our observations to similar effects observed in Sn-Pb alloys.
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