Phonon fluorescence in superconductors

Narayanamurti, V. ; Dynes, R. C. (1972) Phonon fluorescence in superconductors Journal de Physique. Colloques, 33 (C4). C4-11 . ISSN 0449-1947

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The propagation and attenuation of heat pulses in superconductors is described. The discontinuous change in phonon lifetime when hω = 2 Δ, the superconducting energy gap, is utilized to convert a pulse of heat into a spectrum with a large density of phonons at a frequency ω = 2 Δ/h. This frequency can be tuned with a magnetic field (which changes 2 Δ) and is used for phonon propagation spectroscopy in Ge : Sb and Al2O3 : V3+.

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