“High-temperature” oscillations of the magnetoresistance in bismuth and semimetallic BiSb alloys

The electrical conductivity, magnetoresistance, Shubnikov-de Haas oscillations, and “high-temperature” oscillations (HTO) of the magnetoresistance of semimetallic BiSb alloys are investigated at Sb concentrations C of up to 2.6 at.% The results are compared with those for Bi. It is found that with the aid of the similarity transformation high-temperature oscillations can be expressed in terms of cyclotron masses at extremal cross sections of the Fermi surface. In the region 0 ≤ C ≤ 2.6 at.% the relative change in the periods of the HTO and Shubnikov-de Haas oscillations, due to holes, are observed to be the same. We establish that the amplitude of HTO is described in generalized ln ρ˜ (T) coordinates: for T ≳ 10°K the function ln ρ˜ (T) plotted for specimens with different compositions form a family of parallel straight lines. The shape of the HTO amplitude as a function of the magnetic field is found. We discuss the possibility of applying HTO to the investigation of the energy spectrum over a wide range of temperatures.

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