Low-temperature anomalies of 4He crystals
A. F. Andreev
Kapitza Institute for Physical Problems RAS, 119334 Moscow, Russia
Low-temperature anomalies of hcp 4He crystals (mass decoupling
from a torsional oscillator, shear modulus anomaly, dissipation peaks, heat
capacity peak) are explained. A simple model based on the concept of
resonant tunneling systems in imperfect crystals is proposed. Mass
decoupling is caused by an internal Josephson effect:
the mass supercurrent inside phase coherent tunneling systems.
Quantitative results are in reasonable agreement with experiments.