Abstract
High-precision barometry is used to perform measurements of the temperature dependence of the pressure of helium crystals, located in a constant volume, in the temperature range 50–800mK on crystals of different quality ranging from freshly prepared to carefully annealed. It is found that an additional contribution to the pressure, proportional to T2, appears in on annealed samples. This contribution becomes dominant at T<300mK, i.e. the region where anomalous behavior of solid helium, ascribed to the super solid effect, was previously observed. Such behavior of the pressure is characteristic for the glass phase, and this phase was practically absent in carefully annealed samples. The observed effect shows that in solid helium containing a high concentration of nonequilibrium defects a glass phase forms easily on cooling. Anomalously high pressure relaxation in low-quality samples was also detected in the experiments at temperatures close to the melting temperature. The possible reasons for this effect are discussed.
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