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KFe2Se2 is the Parent Compound of K-Doped Iron Selenide Superconductors

Journal Article


Abstract


  • We elucidate the existing controversies in the newly discovered K-doped iron selenide (KxFe2ySe2z)

    superconductors. The stoichiometric KFe2Se2 with ffiffiffi

    2

    p ffiffiffi

    2

    p charge ordering was identified as the parent

    compound of KxFe2ySe2z superconductor using scanning tunneling microscopy and spectroscopy. The

    superconductivity is induced in KFe2Se2 by either Se vacancies or interacting with the antiferromagnetic

    K2Fe4Se5 compound. In total, four phases were found to exist in KxFe2ySe2z: parent compound

    KFe2Se2, superconducting KFe2Se2 with ffiffiffi

    2

    p ffiffiffi

    5

    p charge ordering, superconducting KFe2Se2z with Se

    vacancies, and insulating K2Fe4Se5 with ffiffiffi

    5

    p ffiffiffi

    5

    p Fe vacancy order. The phase separation takes place at

    the mesoscopic scale under standard molecular beam epitaxy conditions.

    D

Authors


  •   Li, Weijie
  •   Ding, Hao (external author)
  •   Li, Zhi
  •   Deng, Peng (external author)
  •   Chang, Kai (external author)
  •   He, Ke (external author)
  •   Ji, Shuaihua (external author)
  •   Wang, Lili (external author)
  •   Ma, Xu-Cun (external author)
  •   Hu, Jiang-Ping (external author)
  •   Chen, Xi (external author)
  •   Xue, Qi-Kun (external author)

Publication Date


  • 2012

Citation


  • Li, W., Ding, H., Li, Z., Deng, P., Chang, K., He, K., Ji, S., Wang, L., Ma, X., Hu, J., Chen, X. & Xue, Q. (2012). KFe2Se2 is the Parent Compound of K-Doped Iron Selenide Superconductors. Physical Review Letters, 109 057003-1-057003-5.

Scopus Eid


  • 2-s2.0-84864492303

Start Page


  • 057003-1

End Page


  • 057003-5

Volume


  • 109

Place Of Publication


  • United States

Abstract


  • We elucidate the existing controversies in the newly discovered K-doped iron selenide (KxFe2ySe2z)

    superconductors. The stoichiometric KFe2Se2 with ffiffiffi

    2

    p ffiffiffi

    2

    p charge ordering was identified as the parent

    compound of KxFe2ySe2z superconductor using scanning tunneling microscopy and spectroscopy. The

    superconductivity is induced in KFe2Se2 by either Se vacancies or interacting with the antiferromagnetic

    K2Fe4Se5 compound. In total, four phases were found to exist in KxFe2ySe2z: parent compound

    KFe2Se2, superconducting KFe2Se2 with ffiffiffi

    2

    p ffiffiffi

    5

    p charge ordering, superconducting KFe2Se2z with Se

    vacancies, and insulating K2Fe4Se5 with ffiffiffi

    5

    p ffiffiffi

    5

    p Fe vacancy order. The phase separation takes place at

    the mesoscopic scale under standard molecular beam epitaxy conditions.

    D

Authors


  •   Li, Weijie
  •   Ding, Hao (external author)
  •   Li, Zhi
  •   Deng, Peng (external author)
  •   Chang, Kai (external author)
  •   He, Ke (external author)
  •   Ji, Shuaihua (external author)
  •   Wang, Lili (external author)
  •   Ma, Xu-Cun (external author)
  •   Hu, Jiang-Ping (external author)
  •   Chen, Xi (external author)
  •   Xue, Qi-Kun (external author)

Publication Date


  • 2012

Citation


  • Li, W., Ding, H., Li, Z., Deng, P., Chang, K., He, K., Ji, S., Wang, L., Ma, X., Hu, J., Chen, X. & Xue, Q. (2012). KFe2Se2 is the Parent Compound of K-Doped Iron Selenide Superconductors. Physical Review Letters, 109 057003-1-057003-5.

Scopus Eid


  • 2-s2.0-84864492303

Start Page


  • 057003-1

End Page


  • 057003-5

Volume


  • 109

Place Of Publication


  • United States