Slow Spin Dynamics between Ferromagnetic Chains in a Pure-Inorganic Framework

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• 作者：R茅nald David ; Houria Kabbour ; Silviu Colis ; Olivier Mentr茅
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：December 2, 2013
• 年：2013
• 卷：52
• 期：23
• 页码：13742-13750
• 全文大小：566K
• 年卷期：v.52,no.23(December 2, 2013)
• ISSN：1520-510X

文摘

The crystal structure of the new phase BaCo^II₂(As^III₃O₆)₂路2(H₂O) is built from the stacking of infinite [BaCo₂(As₃O₆)₂路H₂O] sheets containing _{鈭?/sub>[Co^IIO4]^{6鈥?/sup> chains interconnected by perpendicular 鈭?/sub>[AsIIIO2]鈭?/sup> chains. It shows a metamagnetic transition below 9 K at a critical field of 0.11 T, leading to a moment value of 70% of the expected saturation, related to the spin flip between individual robust canted ferromagnetic chains. We propose a field-dependent scenario with magnetic moments lying in the CoIIO6 octahedral basal planes, fully compatible with our experimental results. Magnetic measurements under ac-field show slow spin dynamics with an intrinsic single-chain magnet (SCM)-like component slightly modified in the field-aligned regime. The characteristic relaxation time and energy barrier are about 蟿o = 5.1 脳 10鈥?0 s and 螖蟿 = 35.3 K at Hdc = 0, respectively, which falls close to values found for other (but organometallic) SCM CoII chains. This magnetic behavior is unique in the field of pure-inorganic compounds.}}