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Visualizing superconductivity in FeSe nanoflakes on SrTiO3 by scanning tunneling microscopy

Journal Article


Abstract


  • Scanning tunneling microscopy and spectroscopy have been employed to investigate the superconductivity in

    single unit-cell FeSe nanoflakes on SrTiO3 substrates. We find that the differential conductance dI/dV spectra are

    spatially nonuniform and fluctuate within the flakes as their area is reduced to below ∼150 nm2. An enhancement

    in the superconductivity-related gap size as large as 25% is observed. The superconductivity behavior disappears

    when the FeSe nanoflakes reduce to ∼40 nm2. Compared to a previous report [Wang et al., Chin. Phys. Lett.

    29, 037402 (2012)], the gap is asymmetric relative to the Fermi energy EF. All the features, particularly the

    fluctuating gap and quenched superconductivity, could be accounted for by quantum size effects. Our study helps

    to understand nanoscale superconductivity in low-dimensional systems.

UOW Authors


  •   Li, Zhi
  •   Peng, Jun (external author)
  •   Zhang, Hui-Min (external author)
  •   Song, Canli (external author)
  •   Ji, Shuaihua (external author)
  •   Wang, Lili (external author)
  •   He, Ke (external author)
  •   Chen, Xi (external author)
  •   Xue, Qi-Kun (external author)
  •   Ma, Xu-Cun (external author)

Publication Date


  • 2015

Geographic Focus


Citation


  • Li, Z., Peng, J., Zhang, H., Song, C., Ji, S., Wang, L., He, K., Chen, X., Xue, Q. & Ma, X. (2015). Visualizing superconductivity in FeSe nanoflakes on SrTiO3 by scanning tunneling microscopy. Physical Review B: Condensed Matter and Materials Physics, 91 060509-1-060509-5.

Scopus Eid


  • 2-s2.0-84924041988

Start Page


  • 060509-1

End Page


  • 060509-5

Volume


  • 91

Abstract


  • Scanning tunneling microscopy and spectroscopy have been employed to investigate the superconductivity in

    single unit-cell FeSe nanoflakes on SrTiO3 substrates. We find that the differential conductance dI/dV spectra are

    spatially nonuniform and fluctuate within the flakes as their area is reduced to below ∼150 nm2. An enhancement

    in the superconductivity-related gap size as large as 25% is observed. The superconductivity behavior disappears

    when the FeSe nanoflakes reduce to ∼40 nm2. Compared to a previous report [Wang et al., Chin. Phys. Lett.

    29, 037402 (2012)], the gap is asymmetric relative to the Fermi energy EF. All the features, particularly the

    fluctuating gap and quenched superconductivity, could be accounted for by quantum size effects. Our study helps

    to understand nanoscale superconductivity in low-dimensional systems.

UOW Authors


  •   Li, Zhi
  •   Peng, Jun (external author)
  •   Zhang, Hui-Min (external author)
  •   Song, Canli (external author)
  •   Ji, Shuaihua (external author)
  •   Wang, Lili (external author)
  •   He, Ke (external author)
  •   Chen, Xi (external author)
  •   Xue, Qi-Kun (external author)
  •   Ma, Xu-Cun (external author)

Publication Date


  • 2015

Geographic Focus


Citation


  • Li, Z., Peng, J., Zhang, H., Song, C., Ji, S., Wang, L., He, K., Chen, X., Xue, Q. & Ma, X. (2015). Visualizing superconductivity in FeSe nanoflakes on SrTiO3 by scanning tunneling microscopy. Physical Review B: Condensed Matter and Materials Physics, 91 060509-1-060509-5.

Scopus Eid


  • 2-s2.0-84924041988

Start Page


  • 060509-1

End Page


  • 060509-5

Volume


  • 91