Abstract:
Measurements of the magnetothermopower in single bismuth wires are performed at
80 K. Manifestation of the asymmetry in the magnetothermopower designated as Umkher
effect is observed with the opposite direction of the transverse magnetic field.
Investigations of the magnetotransport properties under directed deformation reveal a
rearrangement of the electronic structure with subsequent changes in the anisotropy of the
Fermi surface at high strain rates. A moderate applied strain leads to a decrease in the
magnitude of the Umkehr effect in the thermopower up to the vanishing of the effect
along one of the principal crystallographic axes. The observed behavior of the
magnetothermopower is explained in the framework of the phenomenological theory of
transport phenomena in Bi.