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

Superconductivity and Superconductor-Insulator Transition in Single Crystal Sb2Te3 Nanoflakes

Superconductivity 2016-08-19 v1 Mesoscale and Nanoscale Physics

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

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 $B < BC$ .

Keywords

superconductivity superconductor-insulator transition topological insulator nanoflake weak antilocalization magneto-resistance

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@article{arxiv.1608.05337,
  title  = {Superconductivity and Superconductor-Insulator Transition in Single Crystal Sb2Te3 Nanoflakes},
  author = {Wei-Han Tsai and Chia-Hua Chien and Ping Chung Lee and Min-Nan Ou and Sergey R. Harutyunyan and Yang-Yuan Chen},
  journal= {arXiv preprint arXiv:1608.05337},
  year   = {2016}
}

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14pages, 6 figures

Superconductivity and Superconductor-Insulator Transition in Single Crystal Sb2Te3 Nanoflakes

Abstract

Keywords

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