Thickness Dependence of Superconductivity in Ultrathin NbS2

Article

Abstract

We report a systematic study of thickness-dependent superconductivity and carrier transport properties in exfoliated layered 2H-NbS2. Hall-effect measurements reveal 2H-NbS2 is a p-type metal with hole mobility of 1ā€“3 cm2 Vāˆ’1 sāˆ’1. The superconducting transition temperature is found to decrease with thickness. However, we find that superconductivity is suppressed due to disorder resulting from the incorporation of atmospheric oxygen. Cross-section transmission electron microscope imaging reveals a chemical change of NbS2 in the ambient, resulting in the formation of amorphous oxide layers sandwiching crystalline layered NbS2. Though few-nm-thick 2H-NbS2 completely converts to amorphous oxide in the ambient, PMMA encapsulation prevents further chemical change and preserves superconductivity in thicker samples.

Attributes

Attribute NameValues
Creator
  • Rusen Yan

  • Guru Khalsa

  • Brian T. Schaefer

  • Alexander Janjour

  • Sergei Rouvimov

  • Katja Nowack

  • Huili Xing

  • Debdeep Jena

Journal or Work Title
  • Applied Physics Express

Volume
  • 12

Issue
  • 2

ISSN
  • 18820786

Publication Date
  • 2019-02

Subject
  • Titan TEM

Publisher
  • The Japan Society of Applied Physics

Date Created
  • 2019-08-22

Language
  • English

Departments and Units
Record Visibility and Access Public
Content License
  • All rights reserved

Digital Object Identifier

doi:10.7567/1882-0786/aaff89

This DOI is the best way to cite this article.