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The relaxation time of the electrical conductivity and the non‐linearity coefficient β in n‐type InSb in the temperature range from 1.8 to 4.1°K are studied as a function of power supplied to the sample from a d.c. source. The results are interpreted by considering energy losses by acoustic piezoelectric and deformation‐potential scattering and by optical polar scattering. The constants of piezoelectric and deformation potentials are estimated.

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