Competition between Ferrimagnetism and Magnetic Frustration in Zinc Substituted YBaFe4O7

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• 作者：Tapati Sarkar ; V. Pralong ; V. Caignaert ; B. Raveau
• 刊名：Chemistry of Materials
• 出版年：2010
• 出版时间：May 11, 2010
• 年：2010
• 卷：22
• 期：9
• 页码：2885-2891
• 全文大小：961K
• 年卷期：v.22,no.9(May 11, 2010)
• ISSN：1520-5002

文摘

The substitution of zinc for iron in YBaFe₄O₇ has allowed the oxide series YBaFe_4−xZn_xO₇, with 0.40 ≤ x ≤ 1.50, belonging to the “114” structural family to be synthesized. These oxides crystallize in the hexagonal symmetry (P6₃mc), as opposed to the cubic symmetry (F -43m) of YBaFe₄O₇. Importantly, the dc magnetization shows that the zinc substitution induces ferrimagnetism, in contrast to the spin glass behavior of YBaFe₄O₇. Moreover, ac susceptibility measurements demonstrate that concomitantly these oxides exhibit a spin glass or a cluster glass behavior, which increases at the expense of ferrimagnetism, as the zinc content is increased. This competition between ferrimagnetism and magnetic frustration is interpreted in terms of lifting of the geometric frustration, inducing the magnetic ordering, and of cationic disordering, which favors the glassy state.