Phonon drag and the hall effect in noble metals

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Abstract
The occurrence of a maximum in the measured Hall coefficient R H of noble metals at low temperatures is discussed in terms of a phonon drag mechanism proposed by Alderson, Farrell and Hurd (1968) and the Ettingshausen-Nernst effect. Results of Hall effect measurements are presented for α phase Cu-Zn alloys between 4·2 and 300°k in which a search for phonon drag effects was made. It is concluded that phonon drag effects are too small to play a significant role in determining the Hall coefficient and an alternative explanation for the maximum in R H, involving suppression of Umklapp processes from the neck regions of the Fermi surface, is given.