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- W2811402145 abstract "We report a study of the temperature and stress dependence of the friction associated with a relative motion of of solid $^4$He in contact. The situation where two coupled only by friction exists emerges spontaneously during a disordering of a single crystal contained inside a annular sample space of torsional oscillator (TO). Under the torque applied by the oscillating walls of the the TO these masses move relative to each other, generating measurable dissipation at their interface. We studied this dissipation between 0.5K and 1.8K in solid samples grown from commercially pure $^4$He and from a 100 ppm $^3$He-$^4$He mixture. The data were analyzed by modelling the TO as a driven harmonic oscillator. In this model, analysis of the resonant frequency and amplitude of the TO yields the temperature dependence of the friction coefficient. By fitting the data to specific forms, we found that over our temperature range, the dominant friction mechanism associated with the interfacial motion results from climb of individual dislocations. The characteristic energy scale associated with this internal friction is between 3K and 6K, depending on the sample. The fact that a single value of this energy accounts for the data of a given sample supports the idea that the interface between the moving and static solid is well oriented. The relative motion of the solid in this case can perhaps be described as the low limit of slip-stick motion." @default.
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- W2811402145 date "2012-06-05" @default.
- W2811402145 modified "2023-09-26" @default.
- W2811402145 title "Observation of Dislocation Related Dissipation Mechanism in High Temperature Mobile Solid $^4$He" @default.
- W2811402145 hasPublicationYear "2012" @default.
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