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arXiv · 1107.0653

NMR Study of Disordered Inclusions in the Quenched Solid Helium

A. P. Birchenko·N. P. Mikhin·E. Ya. Rudavskii·Ye. O. Vekhov
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Abstract

Phase structure of rapidly quenched solid helium samples is studied by the NMR technique. The pulse NMR method is used for measurements of spin-lattice $T_1$ and spin-spin $T_2$ relaxation times and spin diffusion coefficient $D$ for all coexisting phases. It was found that quenched samples are two-phase systems consisting of the hcp matrix and some inclusions which are characterized by $D$ and $T_2$ values close to those in liquid phase. Such liquid-like inclusions undergo a spontaneous transition to a new state with anomalously short $T_2$ times. It is found that inclusions observed in both the states disappear on careful annealing near the melting curve. It is assumed that the liquid-like inclusions transform into a new state - a glass or a crystal with a large number of dislocations. These disordered inclusions may be responsible for the anomalous phenomena observed in supersolid region.

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A. P. Birchenko, N. P. Mikhin, E. Ya. Rudavskii, Ye. O. Vekhov. 2011-07-14. NMR Study of Disordered Inclusions in the Quenched Solid Helium. https://doi.org/10.1007/s10909-012-0641-4

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