Unusual negative magnetoresistance in Bi2Se3-ySy topological insulator under perpendicular magnetic field

Rahul Singh, Vinod K. Gangwar, D. D. Daga, Abhishek Singh, A. K. Ghosh, Manoranjan Kumar, A. Lakhani, Rajeev Singh, Sandip Chatterjee

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15 Scopus citations

Abstract

The magneto-transport properties of Bi2Se3-ySy were investigated. Magnetoresistance (MR) decreases with an increase in the S content, and finally, for 7% (i.e., y = 0.21) S doping, the magnetoresistance becomes negative. This negative MR is unusual as it is observed when a magnetic field is applied in the perpendicular direction to the plane of the sample. The magneto-transport behavior shows the Shubnikov-de Haas (SdH) oscillation, indicating the coexistence of surface and bulk states. The negative MR has been attributed to the non-trivial bulk conduction.

Original languageEnglish
Article number102401
JournalApplied Physics Letters
Volume112
Issue number10
DOIs
StatePublished - 5 Mar 2018
Externally publishedYes

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© 2018 Author(s).

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