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

被引：39

作者：

Lu, Hongcheng ^{[1
]}

Yamamoto, Takafumi ^{[1
]}

Yoshimune, Wataru ^{[1
]}

Hayashi, Naoaki ^{[2
,3
]}

Kobayashi, Yoji ^{[1
]}

Ajiro, Yoshitami ^{[1
]}

Kageyama, Hiroshi ^{[1
,3
,4
]}

机构：

[1] Kyoto Univ, Grad Sch Engn, Kyoto 6158510, Japan

[2] Res Inst Prod Dev, Sakyo Ku, Kyoto 6060805, Japan

[3] Kyoto Univ, Inst Integrated Cell Mat Sci iCeMS, Sakyo Ku, Kyoto 6068501, Japan

[4] Japan Sci & Technol Agcy JST, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2015年 / 137卷 / 31期

关键词：

LINEAR-CHAIN ANTIFERROMAGNETISM; HALDANE-GAP; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; HYDROTHERMAL SYNTHESIS; SPIN CHAIN; BPY=4,4'-BIPYRIDINE; TRANSITIONS; PEROVSKITE; SYSTEMS;

D O I：

10.1021/jacs.5b06120

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An ideal one-dimensional (11)) 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' tends to drive a conventional long-range ordered (LRO) state. Here, a new layered structure of FeF3(4,4'-bpy) (4,4'-bpy = 4,4'-bipyridyl) with novel S = 5/2 (Fe3+) chains has been hydrothermally synthesized by using 4,4'-bpy to separate chains. The temperature-dependent susceptibility exhibits a broad maximum at high as 164 K, suggesting a fairly strong Fe-F-Fe 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' with J'/J < 3.2 x 10(-5), making this new material a nearly ideal ID antiferromagnet. Mossbauer spectroscopy at 2.7 K reveals a critical slowing down of the 1D fluctuations toward a possible LRO at lower temperatures.

引用

页码：9804 / 9807

页数：4

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