Термоэлектрические свойства нитей Bi1-х Sbх при упругом растяжении в магнитном поле

Abstract

In this work we studied the combined effect of longitudinal magnetic field and elastic strain on the thermoelectric properties of thin filaments Bi0.88Sb0.12, obtained by the method of Ulitovskogo, and doped with donor and acceptor impurities. The measurements were made at temperature 4,2 – 300 К, in magnetic fields up to 14 Т. The maximum value of elongation at the elastic tension was 1,3% at Т = 4,2 – 200 К. The diameter of the samples ranged from 200 nm to 5 mm and was controlled by SEM microscope. It was found that at a temperature of 120 К, in magnetic fields up to 0,4 Т an increase in the thermoelectric power of 14 – 20%. With the help of elastic strain failed to suppress a sharp rise in resistance in the magnetic fields of 0,4 Т, typical for bulk samples of bismuth and fibers in the undeformed state. This led to a significant increase in power factor at temperatures higher than 120 К.