Inelastic electron tunneling experiments have been performed in Bi0.94Sb0.06–Al oxide-Al junctions. A strong peak observed at 1.9 mV in the second derivative tunnel spectra is closely related to the estimated effective Debye temperature, besides intervalley acoustic and optical phonon structures. This structure clearly corresponds to the electron–intravalley acoustic phonon coupling.
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Nagao et al. (1999) studied this question.
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