Clusters and ions in {TR₆}X₁₂R (T=Fe, Co, Ru, Os, Ir, R=Dy, Ho, Er, X=Br, I)¡ªA magnetic study

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• 作者：Martin Valldor ; Eva Meyer ; Christian Rustige ; Gerd Meyer
• 关键词：AC-susceptibility ; Spin-freezing ; Rare-earth magnetism ; Molecular magnet
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：347
• 期：Complete
• 页码：4-9
• 全文大小：1037 K

文摘

Eight cluster complex compounds with the composition {TR₆}X₁₂R (T=Fe, Co, Ru, Os, Ir, R=Dy, Ho, Er, X=Br, I) exhibiting the same crystal structure, {BSc₆}Cl₁₂Sc type, were investigated by magnetometry. A diversity of magnetic properties was recorded depending on chemical compositions. Long range spin order is suggested for {CoHo₆}I₁₂Ho, {FeHo₆}I₁₂Ho and {OsDy₆}I₁₂Dy below 40, 20 and 17 K, respectively. The occurrence of 1-10 % magnetic energy losses at lower temperatures with strong frequency dependence makes several of the compounds comparable with molecular magnets. Both the {TR₆} cluster and the single R³⁺ ion contribute to out-of-phase susceptibility; these effects appear separately and can be investigated individually by employing an AC-magnetic field.