Magnetotransport properties of BiSe whiskers

Abstract

Doped Bi₂Se₃ superconductors, such as Cu_xBi₂Se₃, Sr_xBi₂Se₃, Nb_xBi₂Se₃ are shown to be nematic superconductors in addition to the observed topological superconductivity. Recently it was found superconductivity in Pd_xBi₂Se₃ whiskers. The superconductivity has a residual character and probably exists on the whisker surface. The present paper deals with checking a possible nematicity existing in Pd_xBi₂Se₃ whiskers. The suppression of superconductivity was measured in the magnetic fields with induction up to 1.5 T. It was found the dependency of upper critical fields on the angle of magnetic field application. The dependency is explained in the framework of Ginzburg–Landau model and described by rather small anisotropy parameter 1.2. Besides blurring of temperature Curie near 5.3 K was observed of about 0.5 K that additionally confirmed the nematicity in Pd_xBi₂Se₃ whiskers. The rather high Curie temperature as well as nematicity existing is probably connected with strong spin–orbit interaction (SOI) of the charge carriers in the whiskers which stabilizing the superconductive state. When the temperature exceeds T_c weak antilocalization of charge carriers is observed in the whisker magnetoresistance.

Graphical Abstract

Keywords:

• Bi₂Se₃
• critical fields
• magnetoresistance
• nematicity
• superconductivity
• whiskers

Acknowledgments

The authors thank Dr. Kutrakov O.P. (Lviv Polytechnic National University) for technical support and sample preparation.

Conflict of interests

The authors declare that they have no competing interests.

Disclosure statement

This study has nothing to do with human participants or health-related outcomes.

Additional information

Funding

No funding was received.