Frequency Distribution of Phonons in a Ballistic Heat Pulse Determined by Magnetic Resonance
- 15 January 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 5 (2), 700-704
- https://doi.org/10.1103/physrevb.5.700
Abstract
The scattering of ballistic heat pulses by resonant spins in MgO: , tuneable with a magnetic field, has been used to investigate the phonon frequency spectrum of the heat pulses at helium temperatures. A magnetic field of 60 kOe allowed phonons with frequencies up to 288 GHz to be studied. Good agreement was obtained with a Little-type calculation based on an acoustic-impedance model of interfacial thermal conduction. It is suggested that the lack of such agreement by most previous workers has often been due to inadequate preparation of surfaces.
Keywords
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