Possible high-temperature disorder-induced mobility of solid 4He at T ∼ 1.8 K

It has been recently reported that there might be super-solidity of 4He around the temperature range: 1.3 K to 1.9 K [A. Eyal, O. Pelleg, L. Embon, E. Polturak, Phys. Rev. Lett. 105, 025301 (2010)]. By treating the solid 4He at very low temperature locally as an amorphous matter and using the transition-rate dependent model together with the specific activation energy and volume, we can observe a series of sudden change of the shearing stresses (which relate to the resistance) at corresponding onset temperatures of super-solid 4He considering the role of holes or defects. We found that the possible super-solidity of 4He might occur at the temperature 1.8 K after intensive calculations. (author)