The model commonly assumed to explain the narrowing of the ESR spectra of donor impurities in germanium is examined in detail. This model combines the Anderson line-narrowing theory with the Miller and Abrahams theory for the phonon-induced tunneling (hopping) of an electron between impurities. The predictions of this model are found to be in drastic disagreement with experimental results now available. It is shown that the narrowed linewidth should depend strongly on donor concentration, acceptor concentration, and temperature. Future spin-resonance experiments in highly compensated samples may show the effects of hopping, but no evidence now exists which indicates that hopping is influencing the narrowing of the ESR spectra. © 1974 The American Physical Society.
D. L. Meier et al., "Evaluation Of Model For The Contributin Of Phonon-induced Tunneling To Donor ESR Spectral Narrowing In Germanium," Physical Review B, vol. 10, no. 3, pp. 814 - 821, American Physical Society, Jan 1974.
The definitive version is available at https://doi.org/10.1103/PhysRevB.10.814
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01 Jan 1974