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Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures.

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Two-dimensional superconductivity in Bi2Te3/FeTe heterostructures is robust, even after air exposure. The study reveals two-dimensional vortex dynamics, crucial for searching for Majorana fermions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Two-dimensional (2D) superconductivity in heterostructures offers a novel platform for exploring exotic phenomena.
  • Majorana fermions are predicted to exist at the core of vortices in superconducting systems.
  • Understanding vortex dynamics is critical for harnessing these phenomena.

Purpose of the Study:

  • To investigate the robustness of interfacial superconductivity in Bi2Te3/FeTe heterostructures.
  • To examine the two-dimensional vortex dynamics in these systems under varying conditions.
  • To explore the impact of aging on superconducting properties and vortex behavior.

Main Methods:

  • Fabrication of Bi2Te3/FeTe heterostructures with varying Bi2Te3 epilayer thicknesses (3, 5, 7, 14 nm).
  • Electrical resistance measurements of as-grown and aged samples (after two years of air exposure).
  • Analysis of temperature-dependent resistance and magnetic field dependence of activation energy.

Main Results:

  • Superconductivity remains robust in Bi2Te3/FeTe heterostructures, even with a 3 nm Bi2Te3 layer after aging.
  • A new superconducting feature at ~13 K emerges in aged samples.
  • Resistance below the transition temperature follows the Arrhenius relation, indicating thermally activated flux flow.
  • Activation energy shows a logarithmic dependence on magnetic field, confirming 2D vortex dynamics.

Conclusions:

  • Bi2Te3/FeTe heterostructures exhibit robust interfacial superconductivity and 2D vortex dynamics.
  • Aging-induced Te vacancies may contribute to observed phenomena.
  • These findings are significant for the search for Majorana fermions in condensed matter systems.