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Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films

Journal Article


Abstract


  • The recent discovery of possible high-temperature superconductivity

    in single-layer FeSe films1,2 has generated significant

    experimental and theoretical interest3,4

    . In both the cuprate5,6

    and the iron-based7–11 high-temperature superconductors, superconductivity

    is induced by doping charge carriers into the

    parent compound to suppress the antiferromagnetic state. It is

    therefore important to establish whether the superconductivity

    observed in the single-layer sheets of FeSe—the essential

    building blocks of the Fe-based superconductors—is realized

    by undergoing a similar transition. Here we report the phase

    diagram for an FeSe monolayer grown on a SrTiO3 substrate,

    by tuning the charge carrier concentration over a wide range

    through an extensive annealing procedure. We identify two

    distinct phases that compete during the annealing process:

    the electronic structure of the phase at low doping (N phase)

    bears a clear resemblance to the antiferromagnetic parent

    compound of the Fe-based superconductors, whereas the superconducting

    phase (S phase) emerges with the increase in

    doping and the suppression of the N phase. By optimizing

    the carrier concentration, we observe strong indications of

    superconductivity with a transition temperature of 65 ± 5 K.

    The wide tunability of the system across different phases

    makes the FeSe monolayer ideal for investigating not only

    the physics of superconductivity, but also for studying novel

    quantum phenomena more generally.

UOW Authors


  •   He, Shaolong (external author)
  •   He, Junfeng (external author)
  •   Zhang, Wenhao (external author)
  •   Zhao, Lin (external author)
  •   Liu, Defa (external author)
  •   Liu, Xu (external author)
  •   Mou, Daixiang (external author)
  •   Ou, Yun-Bo (external author)
  •   Wang, Qian-Yan (external author)
  •   Li, Zhi
  •   Wang, Lili (external author)
  •   Peng, Yingying (external author)
  •   Liu, Yan (external author)
  •   Chen, Chaoyu (external author)
  •   Yu, Li (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


  • 2013

Geographic Focus


Citation


  • He, S., He, J., Zhang, W., Zhao, L., Liu, D., Liu, X., Mou, D., Ou, Y., Wang, Q., Li, Z., Wang, L., Peng, Y., Liu, Y., Chen, C., Yu, L., Liu, G., Dong, X., Zhang, J., Chen, C., Xu, Z., Chen, X., Ma, X., Xue, Q. & Zhou, X. J. (2013). Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films. Nature Materials, 12 605-610.

Scopus Eid


  • 2-s2.0-84879419698

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2638

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 605

End Page


  • 610

Volume


  • 12

Place Of Publication


  • United Kingdom

Abstract


  • The recent discovery of possible high-temperature superconductivity

    in single-layer FeSe films1,2 has generated significant

    experimental and theoretical interest3,4

    . In both the cuprate5,6

    and the iron-based7–11 high-temperature superconductors, superconductivity

    is induced by doping charge carriers into the

    parent compound to suppress the antiferromagnetic state. It is

    therefore important to establish whether the superconductivity

    observed in the single-layer sheets of FeSe—the essential

    building blocks of the Fe-based superconductors—is realized

    by undergoing a similar transition. Here we report the phase

    diagram for an FeSe monolayer grown on a SrTiO3 substrate,

    by tuning the charge carrier concentration over a wide range

    through an extensive annealing procedure. We identify two

    distinct phases that compete during the annealing process:

    the electronic structure of the phase at low doping (N phase)

    bears a clear resemblance to the antiferromagnetic parent

    compound of the Fe-based superconductors, whereas the superconducting

    phase (S phase) emerges with the increase in

    doping and the suppression of the N phase. By optimizing

    the carrier concentration, we observe strong indications of

    superconductivity with a transition temperature of 65 ± 5 K.

    The wide tunability of the system across different phases

    makes the FeSe monolayer ideal for investigating not only

    the physics of superconductivity, but also for studying novel

    quantum phenomena more generally.

UOW Authors


  •   He, Shaolong (external author)
  •   He, Junfeng (external author)
  •   Zhang, Wenhao (external author)
  •   Zhao, Lin (external author)
  •   Liu, Defa (external author)
  •   Liu, Xu (external author)
  •   Mou, Daixiang (external author)
  •   Ou, Yun-Bo (external author)
  •   Wang, Qian-Yan (external author)
  •   Li, Zhi
  •   Wang, Lili (external author)
  •   Peng, Yingying (external author)
  •   Liu, Yan (external author)
  •   Chen, Chaoyu (external author)
  •   Yu, Li (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


  • 2013

Geographic Focus


Citation


  • He, S., He, J., Zhang, W., Zhao, L., Liu, D., Liu, X., Mou, D., Ou, Y., Wang, Q., Li, Z., Wang, L., Peng, Y., Liu, Y., Chen, C., Yu, L., Liu, G., Dong, X., Zhang, J., Chen, C., Xu, Z., Chen, X., Ma, X., Xue, Q. & Zhou, X. J. (2013). Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films. Nature Materials, 12 605-610.

Scopus Eid


  • 2-s2.0-84879419698

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2638

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 605

End Page


  • 610

Volume


  • 12

Place Of Publication


  • United Kingdom