Superconductivity and Superconductor-Insulator Transition in Single Crystal Sb2Te3 Nanoflakes

We report on transport properties of the topological insulator single crystal \(Sb2Te3\) nanoflakes with thickness about from 7 to 50nm. A steep drop of resistance is appeared near \(3K\) in the ultrathin \(Sb2Te3\) nanoflakes, manifesting a superconducting transition.The magnetic field induced supe...

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Bibliographic Details
Published in:arXiv.org 2016-08
Main Authors: Wei-Han, Tsai, Chia-Hua, Chien, Ping Chung Lee, Min-Nan Ou, Harutyunyan, Sergey R, Yang-Yuan, Chen
Format: Article
Language:English
Subjects:
Single crystals
Superconductivity
Superconductors
Temperature dependence
Thickness
Transport properties
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Summary:We report on transport properties of the topological insulator single crystal \(Sb2Te3\) nanoflakes with thickness about from 7 to 50nm. A steep drop of resistance is appeared near \(3K\) in the ultrathin \(Sb2Te3\) nanoflakes, manifesting a superconducting transition.The magnetic field induced superconductor insulator transition of disordered 2D superconductor system is observed in the nanoflakes.The results show that the existence of certain optimum degree of disorder is a necessary condition for emergence of superconductivity.Temperature dependence of magneto-resistance shows a consecutive transformation of weak antilocalization cusp into the superconducting transition at low field when \(B < BC\).
ISSN:2331-8422