11 research outputs found

    Tunnelling defect nanoclusters in hcp 4He crystals: alternative to supersolidity

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    A simple model based on the concept of resonant tunnelling clusters of lattice defects is used to explain the low temperature anomalies of hcp 4He crystals (mass decoupling from a torsional oscillator, shear modulus anomaly, dissipation peaks, heat capacity peak). Mass decoupling is a result of an internal Josephson effect: mass supercurrent inside phase coherent tunnelling clusters. Quantitative results are in reasonable agreement with experiments.Comment: 13 pages, 5 figure

    Speech and Language Issues in the Cleft Palate Population: The State of the Art

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