Doping-driven structural phase transition and loss of superconductivity in MxFe1-xSe delta (M=Mn, Cu)

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2010

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Abstract

In this paper, we report the results of detailed studies on Mn and Cu substitution to Fe site of beta-FeSe, namely, MnxFe(1-x)Se(1-delta) and CuxFe1-xSe1-delta (delta equals to 0.03-0.05 based on our neutron-diffraction refinements). 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.

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Huang,Tzu-Wen;Chen,Ta-Kun;Yeh,Kuo-Wei;Ke,Chung-Ting;Chen,Chi Liang;Huang,Yi-Lin;Hsu,Fong-Chi;Wu,Maw-Kuen;Wu,Phillip M.;Avdeev,Maxim;Studer,Andrew J.. 2010. Doping-driven structural phase transition and loss of superconductivity in MxFe1-xSe delta (M=Mn, Cu). Physical Review B 82(10): 104502-104502.

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10.1103/PhysRevB.82.104502


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