2001年9月
Superparamagnetic behavior in a Ni vermiculite intercalation compound
PHYSICAL REVIEW B
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- 巻
- 64
- 号
- 10
- 開始ページ
- 104418
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- 出版者・発行元
- AMER PHYSICAL SOC
The Ni vermiculite intercalation compound (VIC) magnetically behaves like a quasi two-dimensional (2D) Ising-like site-random ferromagnet on the triangular lattice sites. with weak anti ferromagnetic interplanar interactions. The magnetic properties of Ni VIC have been studied using superconducting quantum interference device (SQUID) DC magnetization and SQUID AC magnetic susceptibility measurements. The 2D ferromagnetic short-range order of Ni2+ spins starts to grow below 45 K. A partially disordered antiferromagnetic phase is established below T-N(=21.OK), where 2D ferromagnetic Ni clusters are antiferromagnetically coupled along the c axis. The dispersion chi'(cc) along the c axis shows a peak around 2-3 K shifting to the low-temperature side with increasing AC frequency. Temperature dependence of the corresponding average relaxation time is well described by a generalized Arrhenius law. The system may be formed of disordered antiferromagnetic clusters, exhibiting a superparamagnetic behavior.
- リンク情報
- ID情報
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- ISSN : 1098-0121
- eISSN : 1550-235X
- Web of Science ID : WOS:000170978400055