Auger recombination oscillation of magnetoresistance in Hg 1− xCd xTe under heated electron and hole condition

Abstract

A new effect of magnetic quantum oscillation of magnetoresistance due to Auger recombination is reported. Small oscillation of the longitudinal magnetoresistance of nHg 1− x Cd x Te ( x = 0.195 ∼ 0.210) was investigated under heated electron and hole condition by d.c. method (up to about 10 V cm −1) using a second derivative method. 4 peaks were observed at 4.2 K under the electric field above 1 V cm −1, while no peaks appeared in the ohmic magnetoresistance. Peak height increases with applied electric field. All peak positions coincide with a calculation based on an interpretation that the magnetoresistance peaks are due to the decrease of excess carrier through the onset of Auger recombination at the resonance magnetic field. Results of the similar measurement at higher temperatures up to 60 K can be also interpreted based on the same model.