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Boosting Superconducting Properties of Fe(Se, Te) via Dual-Oscillation Phenomena Induced by Fluorine Doping

Journal Article


Abstract


  • Fluorine-doped Fe(Se, Te) has been successfully synthesized using the melting method. A dual-oscillation effect was found in the F-doped sample, which combined both microstructural oscillation and chemical compositional oscillation. The microstructural oscillation could be attributed to alternate growth of tetragonal β-Fe(Se, Te) and hexagonal δ-Fe(Se, Te), which formed a pearlite-like structure and led to the enhancement of δl flux pinning due to the alternating distributed nonsuperconducting δ-Fe(Se, Te) phase. The chemical compositional oscillations in β-Fe(Se, Te) phase were because of the inhomogeneously distributed Se and Te, which changes the pinning mechanism from surface pinning in the undoped sample to κ pinning in the 5% F-doped one. As a result, the critical current, upper critical field, and thermally activated flux-flow activation energy of FeSe 0.45 Te 0.5 F 0.05 were enhanced by 7, 2, and 3 times, respectively. Our work revealed the physical insights into F-doping resulting in high-performance Fe(Se, Te) superconductors and inspired a new approach to optimize superconductivities in iron-based superconductors through phase and element manipulations.

Authors


  •   Liu, Jixing (external author)
  •   Zhang, Shengnan (external author)
  •   Li, Meng (external author)
  •   Sang, Lina (external author)
  •   Li, Zhi
  •   Cheng, Zhenxiang
  •   Zhao, Weiyao (external author)
  •   Feng, Jianqing (external author)
  •   Li, Chengshan (external author)
  •   Prof Ping Xiang Zhang, Ping Xiang (external author)
  •   Dou, Shi Xue
  •   Wang, Xiaolin
  •   Zhou, Lian (external author)

Publication Date


  • 2019

Citation


  • Liu, J., Zhang, S., Li, M., Sang, L., Li, Z., Cheng, Z., Zhao, W., Feng, J., Li, C., Zhang, P., Dou, S., Wang, X. & Zhou, L. (2019). Boosting Superconducting Properties of Fe(Se, Te) via Dual-Oscillation Phenomena Induced by Fluorine Doping. ACS Applied Materials and Interfaces, 11 18825-18832.

Scopus Eid


  • 2-s2.0-85065875060

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3646

Number Of Pages


  • 7

Start Page


  • 18825

End Page


  • 18832

Volume


  • 11

Place Of Publication


  • United States

Abstract


  • Fluorine-doped Fe(Se, Te) has been successfully synthesized using the melting method. A dual-oscillation effect was found in the F-doped sample, which combined both microstructural oscillation and chemical compositional oscillation. The microstructural oscillation could be attributed to alternate growth of tetragonal β-Fe(Se, Te) and hexagonal δ-Fe(Se, Te), which formed a pearlite-like structure and led to the enhancement of δl flux pinning due to the alternating distributed nonsuperconducting δ-Fe(Se, Te) phase. The chemical compositional oscillations in β-Fe(Se, Te) phase were because of the inhomogeneously distributed Se and Te, which changes the pinning mechanism from surface pinning in the undoped sample to κ pinning in the 5% F-doped one. As a result, the critical current, upper critical field, and thermally activated flux-flow activation energy of FeSe 0.45 Te 0.5 F 0.05 were enhanced by 7, 2, and 3 times, respectively. Our work revealed the physical insights into F-doping resulting in high-performance Fe(Se, Te) superconductors and inspired a new approach to optimize superconductivities in iron-based superconductors through phase and element manipulations.

Authors


  •   Liu, Jixing (external author)
  •   Zhang, Shengnan (external author)
  •   Li, Meng (external author)
  •   Sang, Lina (external author)
  •   Li, Zhi
  •   Cheng, Zhenxiang
  •   Zhao, Weiyao (external author)
  •   Feng, Jianqing (external author)
  •   Li, Chengshan (external author)
  •   Prof Ping Xiang Zhang, Ping Xiang (external author)
  •   Dou, Shi Xue
  •   Wang, Xiaolin
  •   Zhou, Lian (external author)

Publication Date


  • 2019

Citation


  • Liu, J., Zhang, S., Li, M., Sang, L., Li, Z., Cheng, Z., Zhao, W., Feng, J., Li, C., Zhang, P., Dou, S., Wang, X. & Zhou, L. (2019). Boosting Superconducting Properties of Fe(Se, Te) via Dual-Oscillation Phenomena Induced by Fluorine Doping. ACS Applied Materials and Interfaces, 11 18825-18832.

Scopus Eid


  • 2-s2.0-85065875060

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3646

Number Of Pages


  • 7

Start Page


  • 18825

End Page


  • 18832

Volume


  • 11

Place Of Publication


  • United States