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An apparatus for making measurements of the Seebeck effect between 20^ and 375^ is described. Experimental curves of the Seebeck effect are given for a series of germanium crystals in which various concentrations of acceptor and donor atoms have been incorporated. The Seebeck data are compared with Hall data obtained concurrently. Above 250^ the two effects can be correlated by means of existing theory. Below 250^ a marked discrepancy occurs between existing theory and experiment. The temperature dependence of this discrepancy and its dependence upon concentration of added atoms are given. The results are consistent with a new theory proposed by C. Herring which considers an interaction between the phonon and electron systems. A dependence of Seebeck voltage upon sample dimension which is predicted by Herring's theory has been found in the temperature region below 50^. A value of (0. 750. 2) m has been determined for the mass parameter of both holes and electrons which enters into the "density of states" equation.
Geballe et al. (Tue,) studied this question.
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