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Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films

Journal Article


Abstract


  • The latest discovery of possible high-temperature superconductivity in the single-layer FeSe

    film grown on a SrTiO3 substrate has generated much attention. Initial work found that,

    while the single-layer FeSe/SrTiO3 film exhibits a clear signature of superconductivity, the

    double-layer film shows an insulating behaviour. Such a marked layer-dependent difference is

    surprising and the underlying origin remains unclear. Here we report a comparative angleresolved

    photoemission study between the single-layer and double-layer FeSe/SrTiO3 films

    annealed in vacuum. We find that, different from the single-layer FeSe/SrTiO3 film, the

    double-layer FeSe/SrTiO3 film is hard to get doped and remains in the semiconducting/

    insulating state under an extensive annealing condition. Such a behaviour originates from the

    much reduced doping efficiency in the bottom FeSe layer of the double-layer FeSe/SrTiO3 film

    from the FeSe–SrTiO3 interface. These observations provide key insights in understanding the

    doping mechanism and the origin of superconductivity in the FeSe/SrTiO3 films.

Authors


  •   Liu, Xu (external author)
  •   Liu, Defa (external author)
  •   Zhang, Wenchao (external author)
  •   He, Junfeng (external author)
  •   Zhao, Lin (external author)
  •   He, Shaolong (external author)
  •   Mou, Daixiang (external author)
  •   Li, Fangsen (external author)
  •   Tang, Chenjia (external author)
  •   Li, Zhi
  •   Wang, Lili (external author)
  •   Peng, Yingying (external author)
  •   Liu, Yan (external author)
  •   Chen, Chaoyu (external author)
  •   Liu, Guodong (external author)
  •   Dong, Xiaoli (external author)
  •   Zhang, Jun (external author)
  •   Chen, Chuangtian (external author)
  •   Xu, Zuyan (external author)
  •   Chen, Xi (external author)
  •   Ma, Xu-Cun (external author)
  •   Xue, Qi-Kun (external author)
  •   Zhou, X J. (external author)

Publication Date


  • 2014

Geographic Focus


Citation


  • Liu, X., Liu, D., Zhang, W., He, J., Zhao, L., He, S., Mou, D., Li, F., Tang, C., Li, Z., Wang, L., Peng, Y., Liu, Y., Chen, C., Liu, G., Dong, X., Zhang, J., Chen, C., Xu, Z., Chen, X., Ma, X., Xue, Q. & Zhou, X. J. (2014). Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films. Nature Communications, 5 5047-1-5047-10.

Scopus Eid


  • 2-s2.0-84918806627

Start Page


  • 5047-1

End Page


  • 5047-10

Volume


  • 5

Place Of Publication


  • United Kingdom

Abstract


  • The latest discovery of possible high-temperature superconductivity in the single-layer FeSe

    film grown on a SrTiO3 substrate has generated much attention. Initial work found that,

    while the single-layer FeSe/SrTiO3 film exhibits a clear signature of superconductivity, the

    double-layer film shows an insulating behaviour. Such a marked layer-dependent difference is

    surprising and the underlying origin remains unclear. Here we report a comparative angleresolved

    photoemission study between the single-layer and double-layer FeSe/SrTiO3 films

    annealed in vacuum. We find that, different from the single-layer FeSe/SrTiO3 film, the

    double-layer FeSe/SrTiO3 film is hard to get doped and remains in the semiconducting/

    insulating state under an extensive annealing condition. Such a behaviour originates from the

    much reduced doping efficiency in the bottom FeSe layer of the double-layer FeSe/SrTiO3 film

    from the FeSe–SrTiO3 interface. These observations provide key insights in understanding the

    doping mechanism and the origin of superconductivity in the FeSe/SrTiO3 films.

Authors


  •   Liu, Xu (external author)
  •   Liu, Defa (external author)
  •   Zhang, Wenchao (external author)
  •   He, Junfeng (external author)
  •   Zhao, Lin (external author)
  •   He, Shaolong (external author)
  •   Mou, Daixiang (external author)
  •   Li, Fangsen (external author)
  •   Tang, Chenjia (external author)
  •   Li, Zhi
  •   Wang, Lili (external author)
  •   Peng, Yingying (external author)
  •   Liu, Yan (external author)
  •   Chen, Chaoyu (external author)
  •   Liu, Guodong (external author)
  •   Dong, Xiaoli (external author)
  •   Zhang, Jun (external author)
  •   Chen, Chuangtian (external author)
  •   Xu, Zuyan (external author)
  •   Chen, Xi (external author)
  •   Ma, Xu-Cun (external author)
  •   Xue, Qi-Kun (external author)
  •   Zhou, X J. (external author)

Publication Date


  • 2014

Geographic Focus


Citation


  • Liu, X., Liu, D., Zhang, W., He, J., Zhao, L., He, S., Mou, D., Li, F., Tang, C., Li, Z., Wang, L., Peng, Y., Liu, Y., Chen, C., Liu, G., Dong, X., Zhang, J., Chen, C., Xu, Z., Chen, X., Ma, X., Xue, Q. & Zhou, X. J. (2014). Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films. Nature Communications, 5 5047-1-5047-10.

Scopus Eid


  • 2-s2.0-84918806627

Start Page


  • 5047-1

End Page


  • 5047-10

Volume


  • 5

Place Of Publication


  • United Kingdom