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arXiv · 1608.05337

Superconductivity and Superconductor-Insulator Transition in Single Crystal Sb2Te3 Nanoflakes

Wei-Han Tsai·Chia-Hua Chien·Ping Chung Lee·Min-Nan Ou·Sergey R. Harutyunyan·Yang-Yuan Chen
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Abstract

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 $B < BC$.

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Wei-Han Tsai, Chia-Hua Chien, Ping Chung Lee, Min-Nan Ou, Sergey R. Harutyunyan, Yang-Yuan Chen. 2016-08-18. Superconductivity and Superconductor-Insulator Transition in Single Crystal Sb2Te3 Nanoflakes. https://arxiv.org/abs/1608.05337

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