Abstract
The results of recent neutron scattering studies of solid helium in silica aerogel are discussed. Previously I.V. Kalinin et al., Pis’ma Zh. Éksp. Teor. Fiz. 87 (1), 743 (2008) [JETP Lett. 87 (1), 645 (2008)], we detected the existence of a superfluid phase in solid helium at a temperature below 0.6 K and a pressure of 51 bar, although, according to the phase diagram, helium should be in the solid state under these conditions. This work is a continuation of the above studies whose main goal was to examine the detected phenomenon and to establish basic parameters of the existence of a superfluid phase. We have determined the temperature of the superfluid transition from solid to superfluid helium, T C = 1.3 K, by analyzing experimental data. The superfluid phase excitation parameters (lifetime, intensity, and energy) have a temperature dependence similar to that of bulk helium. The superfluid phase coexists with the solid phase in the entire measured temperature range from T = 0.05 K to T C and is a nonequilibrium one and disappears at T C.
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Original Russian Text © I.V. Kalinin, E.I. Kats, M. Koza, V.V. Lauter, H. Lauter, A.V. Puchkov, 2010, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 138, No. 2, pp. 243–248.
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Kalinin, I.V., Kats, E.I., Koza, M. et al. Coexistence of superfluid and solid helium in aerogel. J. Exp. Theor. Phys. 111, 215–219 (2010). https://doi.org/10.1134/S1063776110080091
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DOI: https://doi.org/10.1134/S1063776110080091