Magnetic properties of quasi-one-dimensional magnets AM³⁺Si₂O₆ (A=Li, Na; M=Ti, V, Cr)

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• 作者：Isobe ; Masahiko ; Ueda ; Yutaka
• 关键词：75.10.Jm ; 75.50.Ee ; Antiferromagnetism ; Low-dimensional magnetism ; Spin gap behavior
• 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 2
• 页码：948-949
• 文件大小：220 K

摘要

The magnetic properties of the quasi-one-dimensional magnet AM³⁺Si₂O₆ (A=Li, Na; M=Ti, V, Cr) have been investigated in the light of the number of d-electron (spin number). The Ti(d¹)-compound shows a spin-Peierls like transition at the temperature higher than that (T_MAX) at the maximum point of the Bonner–Fisher curve, and the ground state is spin-singlet. The V(d²)- and Cr(d³)-compounds do not show such transition and the ground states are long range antiferromagnetic ordered states. The T_MAX, where a short-range magnetic correlation within the chain is fully developed, decreases with increasing the M–M distance within the chain in the compounds with a fixed dⁿ. On the other hand, it decreases with increasing the number of d-electron in the Na-based compounds, although the M–M distance within the chain becomes shorter with increasing the number of d-electron. Any other factor such as the second nearest interaction or orbital degree of freedom should be taken into the consideration for the explanation of the T_MAX variation with the number of d-electron.