Evidence of Two-dimensional Superconducting Behavior in Atomically Thin Fe(Te<sub>0.7</sub>Se<sub>0.3</sub>) Flakes

ORAL

Abstract

We report detailed thickness-dependent transport studies on strain-free Fe(Te0.7Se0.3) thin flakes. Notably, we present evidence of two-dimensional superconducting behavior in flakes <10nm. For >10nm flakes we find a systematic suppression of the superconductivity and broadening of the superconducting phase transition. Due to non-uniform Te/Se spacial distribution, we find that R(T) behavior in flakes <10nm can be explained and confirmed using the BKT transition for inhomogeneity model, as well as finite state effects(FSE). This inhomogeneous model is supported by the observed thickness dependence of the superconducting transition. We propose a 2D network of superconducting paths connecting superconducting islands within Fe(Te0.7Se0.3) thin flakes to describe the behavior of this natural percolating system.

*This work was supported by the DOE under grant DESC0014208 and by the Board of Regents Support Fund (BoRSF) under grant LEQSF(2015-18)-RD-A-23.

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Presenters

  • Andrew Steely

    • Tulane University

Authors

  • Andrew Steely

    • Tulane University

  • Chunlei Yue

    • Tulane University

  • Yun Ling

    • Tulane University

  • Abin Joshy

    • Tulane University

  • Zhiqiang Mao

    • Pennsylvania State University
    • Physics, Pennsylvania State University
    • Department of Physics and Engineering Physics, Tulane University
    • Physics and Engineering Physics, Tulane University
    • Tulane University

  • Jiang Wei

    • Tulane University