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Research Article Open Access

Anomalous magnetoresistance in topological insulator Bi2Te3

Pramod Kumar1*, Rashmi Singh1, Faizan Ahmad1,  Chandra Shekhar2, Naresh Kumar3, Rachana Kumar4**

1Indian Institute of Information Technology Allahabad, Uttar Pradesh, 211012, India

2Max Planck Institute for Chemicals Physics of Solids, Nothnizer Strasse, Dresden, 4001187, Germany

3 Department of Physics, Motilal Nehru National Institute of Technology, Allahabad, Uttar Pradesh, 211004, India

4National Physical Laboratory, New Delhi, 110012, India

Adv. Mater. Proc., 2016, 1 (1), 4

DOI: 10.5185/amp.2016/105

Publication Date (Web):05 September 2016

Copyright © IAAM-VBRI Press

Abstract


Abstract

A proximity-induced superconductivity is used in a single crystal flake Bi2Te3 topological insulator to probe the behavior of magnetoresistance around the local superconducting critical fields. The magnetoresistance in Bi2Te3 and GaAs materials with superconducting contacts are studied and compared. A contradictory behavior in both of the systems is observed (A positive resistance correction was observed in GaAs, whereas a negative resistance correction was observed in Bi2Te3). For Bi2Te3, periodic oscillations are observed in the dR/d|B| verses B plots. These periodic oscillations originate from a coexistence of proximity-induced superconductivity with a normal linear region created either by temperature or applied magnetic field. At high magnetic fields (> 2T) and low temperatures (1.5K), Shubnikov de Hass oscillations are also observed. Copyright © 2016 VBRI Press

Keywords


Magnetoresistance, superconductivity, topological insulator, shubnikov-de hass (SdH) oscillations, berry phase