Superconductivity and Kondo Effect of PdxBi2Se3 Whiskers at Low Temperatures

Authors A.A. Druzhinin1,2 , N.S. Liakh-Kaguy1, I.P. Ostrovskii1,2 , Yu.M. Khoverko1,2 , K. Rogacki2

1 Ukraine Lviv Polytechnic National University, 12, S. Bander str., 79013 Lviv, Ukraine

2 International Laboratory of High Magnetic Fields and Low Temperatures Wroclaw, Poland

Issue Volume 9, Year 2017, Number 5
Dates Received 20 May 2017; revised manuscript received 08 September 2017; published online 16 October 2017
Citation A.A. Druzhinin, N.S. Liakh-Kaguy, I.P. Ostrovskii, et al., J. Nano- Electron. Phys. 9 No 5, 05013 (2017)
DOI 10.21272/jnep.9(5).05013
PACS Number(s) 73.43.Qt, 71.30.+h
Keywords Bi2Se3 whiskers, Transverse magnetoresistance, Effect Kondo, Superconductivity (2) .
Annotation Temperature dependencies of Bi2Se3 whiskers’ resistance with Pd doping concentration of (1-2)  1019 cm − 3 where measured in temperature range 1.5-77 K. At temperature 5.3 K a sharp drop in the whisker resistance was found. The effect observed is likely resulted from the whiskers partial transition in superconducting state at temperature 5.3 K, which is likely connected with -PdBi2 inclusions in the whiskers. Transverse magnetoresistance in n-type Bi2Se3 whiskers with different doping concentration in the vicinity to the metal-insulator transition from metal side of the transition was studied in magnetic field 0-10 T. The magnetic field suppression of superconductivity allows to determine the main parameters: upper critical magnetic field Bc2  1.5 T, superconductor coherence length (0)  15 nm, superconductive gap   0.8 meV. Besides on the temperature dependence of the whisker resistance and magnetoresistance a minimum was observed in the temperature range 20-25 K that is connected with appearance of Kondo effect.

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