Magnetoresistance of Bi₂Se₃ Whiskers at Low Temperatures

Abstract

Temperature dependencies of Bi2Se3 whiskers’ resistance with Pd doping concentration of 11019 cm-3 where measured in temperature range 4.2 - 300 K. At temperature 5.3 K a sharp drop in the whisker resistance was found. The observed effect is likely connected with contribution of two processes such as the electron localization in the whiskers and transition in superconducting state at temperature 5.3 K, which is likely result from Pd complexes. Transversemagnetoresistance in n-type Bi2Se3 whiskers with Pd doping concentration in the vicinity to themetal-insulator transition (MIT) from metal side of the transition were studied in magnetic field 0 -10 T. For the whiskers a resistance minimum was observed at temperature about 25 K that is connected with Kondo effect. Keywords: Bi2Se3 whiskers; transversemagnetoresistance; effect Kondo; superconductivity.