We report the first ultralow-temperature resistivity measurements on Bi with a precision better than 0.01% using a superconducting quantum interference device null detector. The results are inconsistent with simple carrier-carrier scattering. A Bloch-Gr\"uneisen formula for electron-phonon scattering gives an approximate fit to the lowest-temperature data with an effective reduced Debye temperature of the order of 2 K.
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Uher et al. (1977) studied this question.
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