Relaxation Time and Effective Masses for Charge Carriers in Semimetallic BiSb Alloys versus Alloy Composition

Abstract Recent investigations on the propagation and damping of magnetoplasma waves in semi‐metallic BiSb alloys allow for the conclusion that the effective masses of the holes and the tilt angle of the electron ellipsoids of the Fermi‐surface do not vary in the semimetallic region of the alloy system. The variations of the effective masses for the electrons with alloy composition can be deduced from magnetoplasma wave data and are in good agreement with cyclotron resonance‐ and quantumoscillation experiments. Observation of the wave damping for different measuring configurations indicates, that the relaxation time for the holes decreases more strongly with increasing Sb‐concentration than the relaxation time for the electrons does.

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