A Nearly Ideal One-Dimensional S = 5/2 Antiferromagnet FeF3(4,4鈥?bpy) (4,4鈥?bpy =4,4鈥?bipyridyl) with Strong Intrachain Interactions

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• 作者：Hongcheng Lu ; Takafumi Yamamoto ; Wataru Yoshimune ; Naoaki Hayashi ; Yoji Kobayashi ; Yoshitami Ajiro ; Hiroshi Kageyama
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：137
• 期：31
• 页码：9804-9807
• 全文大小：301K
• ISSN：1520-5126

文摘

An ideal one-dimensional (1D) magnet is expected to show exotic quantum phenomena. For compounds with larger S (S = 3/2, 2, 5/2, ...), however, a small interchain interaction J鈥?tends to drive a conventional long-range ordered (LRO) state. Here, a new layered structure of FeF₃(4,4鈥?bpy) (4,4鈥?bpy = 4,4鈥?bipyridyl) with novel S = 5/2 (Fe³⁺) chains has been hydrothermally synthesized by using 4,4鈥?bpy to separate chains. The temperature-dependent susceptibility exhibits a broad maximum at high as 164 K, suggesting a fairly strong Fe鈥揊鈥揊e intrachain interaction J. However, no anomaly associated with a LRO is seen in both magnetic susceptibility and specific heat even down to 2 K. This indicates an extremely small J鈥?with J鈥?J < 3.2 脳 10^鈥?, making this new material a nearly ideal 1D antiferromagnet. M枚ssbauer spectroscopy at 2.7 K reveals a critical slowing down of the 1D fluctuations toward a possible LRO at lower temperatures.