Observation of phonon frequency thresholds in the anomalous Kapitza resistance

Otto Koblinger, Ulrich Heim, Michael Welte & Wolfgang Eisenmenger
Phonons emitted by superconducting tunneling junctions into insulator crystal substrates exhibit a sharp amplitude reduction above 85 GHz if the tunneling diodes are covered by 4He. This is attributed to the onset of an enhanced phonon transport into helium.
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