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
TL;DR
This study investigates how Mn and Cu substitution in FeSe affects its structural phase transition and superconductivity, revealing that Cu doping induces a Mott insulating state and that structural changes are crucial for superconductivity.
Contribution
It provides detailed insights into how Mn and Cu substitution influence the structural transition and superconductivity in FeSe, highlighting the role of structural changes in superconducting behavior.
Findings
Cu doping induces a Mott insulating state at 10%
Structural transition is essential for superconductivity
Structural analysis links tetrahedral changes to superconductivity
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.
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Taxonomy
TopicsIron-based superconductors research · Rare-earth and actinide compounds · Magnetic and transport properties of perovskites and related materials