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Fabrication and Characterization of Superconducting Resonators
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Disorder Enhanced Superconductivity toward TaS2 Monolayer.

Jing Peng1, Zhi Yu1, Jiajing Wu1

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, Hefei Science Center of Chinese Academy of Science (CAS), and CAS Key Laboratory of Mechanical Behavior and Design of Materials , University of Science & Technology of China , Hefei 230026 , PR China.

ACS Nano
|August 22, 2018
PubMed
Summary

Disorder typically harms superconductivity, but this study found an unusual enhancement in tantalum disulfide (TaS2) monolayers. Introducing controlled defects increased the critical temperature (Tc) by increasing carrier density.

Keywords:
2H-TaS2carrier densitydisorderstructural defecttwo-dimensional superconductivity

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Disorder is generally detrimental to two-dimensional (2D) superconductivity, leading to a decrease in critical transition temperature (Tc).
  • Understanding the interplay between disorder and superconductivity is crucial for developing novel superconducting materials.

Purpose of the Study:

  • To investigate the anomalous effect of disorder on superconductivity in two-dimensional (2D) tantalum disulfide (TaS2) monolayers.
  • To explore the potential for enhancing superconductivity through controlled introduction of structural defects.

Main Methods:

  • Chemical exfoliation of TaS2 using varying acid concentrations to control pore density and defect levels.
  • Measurement of superconducting properties, including critical transition temperature (Tc), as a function of disorder.
  • Analysis of the relationship between carrier density and superconductivity in defective TaS2 monolayers.

Main Results:

  • An anomalous enhancement of superconductivity was observed in TaS2 monolayers with increasing disorder below a critical level.
  • The critical transition temperature (Tc) of TaS2 monolayers was enhanced from 2.89 K to 3.61 K.
  • A dome-shaped dependence of superconductivity on disorder was uncovered, deviating from typical monotonic decrements.

Conclusions:

  • Disorder, when engineered through controlled structural defects, can anomalously enhance superconductivity in 2D materials like TaS2.
  • The observed enhancement is attributed to an increase in carrier density caused by the absence of Ta atoms.
  • This finding offers new insights into the complex relationship between disorder and superconductivity in 2D systems and suggests new avenues for superconductor design.