Evolution of magnetic properties in the solid solution

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• 作者：D. Gralak ; A.J. Zaleski ; V.H. Tran ; ^{v.h.tran@int.pan.wroc.pl" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Magnetic phase diagram ; Competition of magnetic interactions ; 5f-electron magnetism ; ac-suceptibility ; dc-magnetisation
• 刊名：Journal of Solid State Chemistry
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：242
• 期：part_P1
• 页码：175-185
• 全文大小：1987 K

文摘

We have investigated the evolution of magnetic properties in pseudo-ternary UCo_1−xPd_xGe (x=0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9) intermetallics by measurements of ac-magnetic susceptibility and dc-magnetization. The measured samples have been prepared by arc-melting and characterized by powder X-ray diffraction and X-ray energy-dispersive electron spectroscopy technique. Rietveld refinements of the X-ray patterns indicate that the pseudo-ternaries crystallize in the orthorhombic TiNiSi-type structure with Pnma space group as the parent UCoGe and UPdGe compounds do. The magnetic measurements reveal that in addition to an increase in 5f  -electron localization degree with increasing Pd concentration, an interesting magnetic phase diagram, which is more complex than that expected from the gradual change in magnetic ground state due to the substitution. Three compositional ranges with different magnetic properties have been established; the coexistence of spin-glass and itinerant-electron ferromagnetic orderings for x≤0.3$x\le 0.3$, antiferromagnetic order occurs in the range 2d5fa4c" title="Click to view the MathML source">0.4≤x≤0.7$0.4\le x\le 0.7$, and a complex ferromagnetic structure of more localized 5f   moments takes place in x≥0.8$x\ge 0.8$. The evolution of magnetic ground states in UCo_1−xPd_xGe is discussed in terms of interplay between cooperative magnetic interactions. We consider also implications of increasing conduction electrons upon the Pd substitution in Ruderman-Kittel-Kasuya-Yosida interactions, which would give rise to the evolution of magnetic properties in UCo_1−xPd_xGe pseudo-ternaries.