Magnetic and structural effects of partial Ce substitution in Y b{sub 14}MnSb{sub 11}
Single crystals of Y b{sub 14−x}Ce{sub x}MnSb{sub 11} were grown from tin metal as a flux solvent with a maximum Ce incorporation of 0.6. The phases with x ∼ 0.1–0.6 crystallize in the tetragonal Ca{sub 14}AlSb{sub 11} structure type with I4{sub 1}/acd space group. In this structure type, there are 4 crystallographically unique Yb sites and the structure can be described according to the Zintl concept as containing 14Y b{sup 2+} + [MnSb{sub 4}]{sup 9−} + [Sb{sub 3}]{sup 7−} + 4Sb{sup 3−}. For x > 0.3, Ce is incorporated on specific Yb sites in the structure as a function of x, initially at x = 0.3 on the Yb(2) site followed by Yb(4) at higher values of x. These sites have the largest volume as indicated by Hirshfeld surface analysis of chemical bonding. As Ce content is increased, the ferromagnetic ordering temperatures decrease and effective paramagnetic moments increase. The magnetic ordering temperatures decrease from the undoped T{sub C} of 50 K until x ∼ 0.4, where the lowest T{sub C} of 39 K is reached. As the additional electron introduced by Ce{sup 3+} fills the hole associated with [MnSb{sub 4}]{sup 9−}, the screening of the Mn moments is reduced. This leads to an increase in overall moment attributed to Mn in addition to the moment from the Ce{sup 3+}f electron. Increasing Ce content also leads to an increase in electrical resistivity, an expected effect from reducing the carrier concentration.
- OSTI ID:
- 22415268
- Journal Information:
- APL materials, Vol. 3, Issue 4; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2166-532X
- Country of Publication:
- United States
- Language:
- English
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