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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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
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Language:English
Subjects:
Copper
Manganese
Materials substitution
Phase transitions
Superconductivity
Temperature dependence
Tetrahedra
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creator 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
description 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.
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subjects Copper
Manganese
Materials substitution
Phase transitions
Superconductivity
Temperature dependence
Tetrahedra
title Structural phase transition in TmxFe1-xSe0.85 (Tm = Mn and Cu) and its relation to superconductivity
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