Two-Dimensional S = 1 Quantum Antiferromagnet (NiCl)Sr2Ta3O10

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• 作者：Yoshihiro Tsujimoto ; Atsushi Kitada ; Yasutomo J. Uemura ; Tatsuo Goko ; Adam A. Aczel ; Travis J. Williams ; Graeme M. Luke ; Yasuo Narumi ; Koichi Kindo ; Masakazu Nishi ; Yoshitami Ajiro ; Kazuyoshi Yoshimur
• 刊名：Chemistry of Materials
• 出版年：2010
• 出版时间：August 24, 2010
• 年：2010
• 卷：22
• 期：16
• 页码：4625-4631
• 全文大小：863K
• 年卷期：v.22,no.16(August 24, 2010)
• ISSN：1520-5002

文摘

A topotactic ion-exchange reaction of a layered perovskite RbSr₂Ta₃O₁₀ with NiCl₂ yielded a novel two-dimensional nickel-oxyhalide (NiCl)Sr₂Ta₃O₁₀, the first S = 1 compound among related series of metal-oxyhalides. The room temperature structure is isostructural with (CuCl)Ca₂Nb₃O₁₀ adopting the space group P4/mmm. We found a possible structural transition at 230 K that does not lead to drastic changes in magnetic character such as nickel clustering. Despite a large Weiss temperature of θ = −125 K, magnetic long-range order is significantly suppressed down to T_N1 ≈ 50 K because of two-dimensionality and strong frustration. The magnetically ordered state below T_N1 has a partial volume fraction coexisting with a paramagnetic component, followed by complete long-range ordering below T_N2 = 20 K. The reaction process and requirement will also be discussed.