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Enhancement of transition temperature in FexSe0.5Te0.5 film via iron vacancies

Journal Article


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Abstract


  • The effects of iron deficiency in Fe x Se0.5Te0.5 thin films (0.8 ≤ x ≤ 1) on superconductivity and electronic properties have been studied. A significant enhancement of the superconducting transition temperature (TC ) up to 21 K was observed in the most Fe deficient film (x = 0.8). Based on the observed and simulated structural variation results, there is a high possibility that Fe vacancies can be formed in the Fe x Se0.5Te0.5 films. The enhancement of TC shows a strong relationship with the lattice strain effect induced by Fe vacancies. Importantly, the presence of Fe vacancies alters the charge carrier population by introducing electron charge carriers, with the Fe deficient film showing more metallic behavior than the defect-free film. Our study provides a means to enhance the superconductivity and tune the charge carriers via Fe vacancy, with no reliance on chemical doping.

Authors


  •   Zhuang, Jincheng (external author)
  •   Yeoh, Wai Kong (external author)
  •   Cui, Xiangyuan (external author)
  •   Kim, Jung Ho
  •   Shi, Dongqi
  •   Shi, Zhixiang (external author)
  •   Ringer, Simon Peter. (external author)
  •   Wang, Xiaolin
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Zhuang, J. C., Yeoh, W. K., Cui, X. Y., Kim, J. H., Shi, D. Q., Shi, Z. X., Ringer, S. P., Wang, X. L. & Dou, S. X. (2014). Enhancement of transition temperature in FexSe0.5Te0.5 film via iron vacancies. Applied Physics Letters, 104 (26), 262601-1-262601-5.

Scopus Eid


  • 2-s2.0-84905666070

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2203&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1202

Has Global Citation Frequency


Start Page


  • 262601-1

End Page


  • 262601-5

Volume


  • 104

Issue


  • 26

Place Of Publication


  • United States

Abstract


  • The effects of iron deficiency in Fe x Se0.5Te0.5 thin films (0.8 ≤ x ≤ 1) on superconductivity and electronic properties have been studied. A significant enhancement of the superconducting transition temperature (TC ) up to 21 K was observed in the most Fe deficient film (x = 0.8). Based on the observed and simulated structural variation results, there is a high possibility that Fe vacancies can be formed in the Fe x Se0.5Te0.5 films. The enhancement of TC shows a strong relationship with the lattice strain effect induced by Fe vacancies. Importantly, the presence of Fe vacancies alters the charge carrier population by introducing electron charge carriers, with the Fe deficient film showing more metallic behavior than the defect-free film. Our study provides a means to enhance the superconductivity and tune the charge carriers via Fe vacancy, with no reliance on chemical doping.

Authors


  •   Zhuang, Jincheng (external author)
  •   Yeoh, Wai Kong (external author)
  •   Cui, Xiangyuan (external author)
  •   Kim, Jung Ho
  •   Shi, Dongqi
  •   Shi, Zhixiang (external author)
  •   Ringer, Simon Peter. (external author)
  •   Wang, Xiaolin
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Zhuang, J. C., Yeoh, W. K., Cui, X. Y., Kim, J. H., Shi, D. Q., Shi, Z. X., Ringer, S. P., Wang, X. L. & Dou, S. X. (2014). Enhancement of transition temperature in FexSe0.5Te0.5 film via iron vacancies. Applied Physics Letters, 104 (26), 262601-1-262601-5.

Scopus Eid


  • 2-s2.0-84905666070

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2203&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1202

Has Global Citation Frequency


Start Page


  • 262601-1

End Page


  • 262601-5

Volume


  • 104

Issue


  • 26

Place Of Publication


  • United States