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

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...

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Bibliographic Details
Published in:arXiv.org 2009-07
Main Authors: Huang, Tzu-Wen, Ta-Kun, Chen, Kuo-Wei, Yeh, Chung-Ting, Ke, Chi Liang Chen, Yi-Lin, Huang, Fong-Chi, Hsu, Wu, Maw-Kuen, Wu, Phillip M, Avdeev, Maxim, Studer, Andrew J
Format: Article
Language:English
Subjects:
Copper
Manganese
Materials substitution
Phase transitions
Superconductivity
Temperature dependence
Tetrahedra
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Summary: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.
ISSN:2331-8422