Phonon Propagation in Liquid and Solid Helium
A brief review is given of recent work on the measurement of anomalous dispersion in the excitation spectrum of Helium II, using superconducting fluorescers and tunnel junctions as sources and detectors of high frequency phonons. In addition, a short discussion of recent observations of ballistic phonons in solid 3He is given. Implications for specific heat measurements are discussed.
KeywordsTunnel Junction Anomalous Dispersion Solid Helium Specific Heat Measurement Phonon Propagation
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