Structural phase transition in TmxFe1-xSe0.85 (Tm = Mn and Cu) and its relation to superconductivity

Tzu-Wen Huang; Ta-Kun Chen; Kuo-Wei Yeh; Chung-Ting Ke; Chi Liang Chen; Yi-Lin Huang; Fong-Chi Hsu; Maw-Kuen Wu; Phillip M. Wu; Maxim Avdeev; Andrew J. Studer

Structural phase transition in TmxFe1-xSe0.85 (Tm = Mn and Cu) and its relation to superconductivity

Superconductivity 2009-07-24 v1

Authors: Tzu-Wen Huang , Ta-Kun Chen , Kuo-Wei Yeh , Chung-Ting Ke , Chi Liang Chen , Yi-Lin Huang , Fong-Chi Hsu , Maw-Kuen Wu , Phillip M. Wu , Maxim Avdeev , Andrew J. Studer

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Abstract

In this letter, we report the results of detailed studies on Mn- and Cu-substitution to Fe-site of beta-FeSe, namely MnxFe1-xSe0.85 and CuxFe1-xSe0.85. The results show that with only 10 at% Cu-doping the compound becomes a Mott insulator. Detailed temperature dependent structural analyses of these Mn- and Cu-substituted compounds show that the structural transition, which is associated with the changes in the building block FeSe4 tetrahedron, is essential to the occurrence of superconductivity in beta-FeSe.

Keywords

structural phase transition superconductivity beta-FeSe Mott insulator FeSe4 tetrahedron Mn substitution Cu substitution

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@article{arxiv.0907.4001,
  title  = {Structural phase transition in TmxFe1-xSe0.85 (Tm = Mn and Cu) and its relation to superconductivity},
  author = {Tzu-Wen Huang and Ta-Kun Chen and Kuo-Wei Yeh and Chung-Ting Ke and Chi Liang Chen and Yi-Lin Huang and Fong-Chi Hsu and Maw-Kuen Wu and Phillip M. Wu and Maxim Avdeev and Andrew J. Studer},
  journal= {arXiv preprint arXiv:0907.4001},
  year   = {2009}
}

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4 pages, 4 figures

Structural phase transition in TmxFe1-xSe0.85 (Tm = Mn and Cu) and its relation to superconductivity

Abstract

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