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

doi:10.1063/1.5019235

Unusual negative magnetoresistance in Bi₂Se_3-yS_y 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

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The magneto-transport properties of Bi₂Se_3-yS_y 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 language	English
Article number	102401
Journal	Applied Physics Letters
Volume	112
Issue number	10
DOIs	https://doi.org/10.1063/1.5019235
State	Published - 5 Mar 2018
Externally published	Yes

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© 2018 Author(s).

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title = "Unusual negative magnetoresistance in Bi2Se3-ySy topological insulator under perpendicular magnetic field",

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.",

author = "Rahul Singh and Gangwar, \{Vinod K.\} and Daga, \{D. D.\} and Abhishek Singh and Ghosh, \{A. K.\} and Manoranjan Kumar and A. Lakhani and Rajeev Singh and Sandip Chatterjee",

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doi = "10.1063/1.5019235",

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T1 - Unusual negative magnetoresistance in Bi2Se3-ySy topological insulator under perpendicular magnetic field

AU - Singh, Rahul

AU - Gangwar, Vinod K.

AU - Daga, D. D.

AU - Singh, Abhishek

AU - Ghosh, A. K.

AU - Kumar, Manoranjan

AU - Lakhani, A.

AU - Singh, Rajeev

AU - Chatterjee, Sandip

PY - 2018/3/5

Y1 - 2018/3/5

N2 - 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.

AB - 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.

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 10

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ER -

Unusual negative magnetoresistance in Bi₂Se_3-yS_y topological insulator under perpendicular magnetic field

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