Mössbauer studies on the Fe(II) oxalate spin ladder Na₂Fe₂(C₂O₄)₃(H₂O)₂

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• 作者：Kreitlow ; J. ; Baabe ; D. ; Wolter ; A.U.B. ; Sü ; llow ; S. ; Litterst ; F.J. ; Price ; D.J. ; Klauss ; H.-H.
• 关键词：76.80.+y ; 75.50.Xx ; 75.10.Dg ; Molecular magnets ; Spin ladder ; Mö ; ssbauer spectroscopy
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2004
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：May, 2004
• 卷：272-276
• 期：Part 1
• 页码：152-153
• 文件大小：194 K

摘要

We investigated the magnetic correlations in the Fe spin ladder system Na₂Fe₂(C₂O₄)₃(H₂O)₂ by magnetic susceptibility and ⁵⁷Fe Mössbauer spectroscopy between 2 and 310K. The susceptibility exhibits a broad maximum at about 20K indicating antiferromagnetic coupling and a S=0 dimer formation. The Mössbauer measurements reveal a temperature dependent quadrupole splitting and a non-magnetic ground state. The orbital ground state is identified as a singlet with an excited doublet at 383K in the T_2g manifold.