1. Physical and magnetic properties of Ba(Fe1−xMnx)2As2single crystals
- Author
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Halyna Hodovanets, Jiaqiang Yan, E. D. Mun, Warren E. Straszheim, M. S. Torikachvili, Paul C. Canfield, Alexander Thaler, Alfred Kracher, and S. Ran
- Subjects
Superconductivity ,Materials science ,Condensed matter physics ,Transition temperature ,Hydrostatic pressure ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,Magnetization ,Crystallography ,Electrical transport ,Seebeck coefficient ,0103 physical sciences ,Magnetic phase transition ,010306 general physics ,0210 nano-technology ,Phase diagram - Abstract
Single crystals of Ba(Fe${}_{1\ensuremath{-}x}$Mn${}_{x}$)${}_{2}$As${}_{2}$, $0lxl0.148$, have been grown and characterized by structural, magnetic, electrical transport, and thermopower measurements. Although growths of single crystals of Ba(Fe${}_{1\ensuremath{-}x}$Mn${}_{x}$)${}_{2}$As${}_{2}$ for the full $0\ensuremath{\leqslant}x\ensuremath{\leqslant}1$ range were made, we find evidence for phase separation (associated with some form of immiscibility) starting for $xg0.1$--0.2. Our measurements show that whereas the structural/magnetic phase transition found in pure BaFe${}_{2}$As${}_{2}$ at 134 K is initially suppressed by Mn substitution, superconductivity is not observed at any substitution level. Although the effect of hydrostatic pressure up to 20 kbar in the parent BaFe${}_{2}$As${}_{2}$ compound is to suppress the structural/magnetic transition at the approximate rate of 0.9 K/kbar, the effects of pressure and Mn substitution in the $x=0.102$ compound are not cumulative. Phase diagrams of transition temperature versus substitution concentration $x$ based on electrical transport, magnetization, and thermopower measurements have been constructed and compared to those of the Ba(Fe${}_{1\ensuremath{-}x}$TM${}_{x}$)${}_{2}$As${}_{2}$ (TM= Co and Cr) series.
- Published
- 2011