Magneto-transport properties of Bi2Se3 whiskers: superconductivity and weak localization

The Bi 2 Se 3 whisker temperature dependencies of resistance with palladium doping concentration of (1 ÷ 2)×10 19  cm −3 were studied in the range of 1.5 ÷ 77 K. At the temperature of 5.3 K there was found a sharp drop in the whisker resistance. This effect can be explained as a contribution of two...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2020-04, Vol.701 (1), p.82-90
Main Authors: Druzhinin, A., Ostrovskii, I., Khoverko, Yu, Liakh-Kaguy, N., Troshina, V.
Format: Article
Language:English
Subjects:
Insulators
Localization
Low temperature
Magnetic fields
Magnetic properties
Magnetoresistance
Magnetoresistivity
Metal concentrations
Metal-insulator transition
Palladium
Superconductivity
Transport properties
weak antilocalization
whiskers
Whiskers (metals)
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Summary:The Bi 2 Se 3 whisker temperature dependencies of resistance with palladium doping concentration of (1 ÷ 2)×10 19  cm −3 were studied in the range of 1.5 ÷ 77 K. At the temperature of 5.3 K there was found a sharp drop in the whisker resistance. This effect can be explained as a contribution of two processes: electron localization and superconductivity at temperatures under 5.3 K. The magnetoresistance in Bi 2 Se 3 whiskers with n-type conductivity and diverse concentration of Pd that correspond to the metal side of the MIT (metal-insulator transition) was studied at low temperatures and magnetic field in the range of 0 ÷ 10 T. The magnetoconductance was considered in the structure by the weak antilocalization model and attached with subsurface layers of Bi 2 Se 3 whiskers.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2020.1732565