Umkehr effect in Hall voltage of polycrystalline bismuth
Laboratoire de Physique des Matériaux,
UMR 7556, Ecole des Mines Parc de Saurupt - F-54042
2 Unité de Physico-Chimie et de Physique des Matériaux Université Catholique de Louvain - Place Croix du Sud,1 B-1348 Louvain-la-Neuve, Belgique
Accepted: 18 January 2002
The Hall effect has been measured on an isotropic polycrystalline sample, from 5 up to room temperature. It appears that the Hall voltage exhibits a strong asymmetry under sign reversal of magnetic field. This peculiar effect becomes more pronounced as the temperature decreases. It is shown that this astonishing behavior, at first glance, can be ascribed to the “Umkehr” effect, previously predicted from a phenomenological point of view, for the off-diagonal components of the magnetoresistivity tensor, for m crystallographic point group.
PACS: 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 81.05.Bx – Metals, semimetals, and alloys / 81.20.Ev – Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
© EDP Sciences, 2002