Coexisting Ferromagnetic and Ferroelectric Order in a CuCl4-based Organic鈥揑norganic Hybrid

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• 作者：Alexey O. Polyakov ; Anne H. Arkenbout ; Jacob Baas ; Graeme R. Blake ; Auke Meetsma ; Antonio Caretta ; Paul H. M. van Loosdrecht ; Thomas T. M. Palstra
• 刊名：Chemistry of Materials
• 出版年：2012
• 出版时间：January 10, 2012
• 年：2012
• 卷：24
• 期：1
• 页码：133-139
• 全文大小：440K
• 年卷期：v.24,no.1(January 10, 2012)
• ISSN：1520-5002

文摘

We investigate the structural, magnetic, and dielectric properties of the organic鈥搃norganic hybrid material CuCl₄(C₆H₅CH₂CH₂NH₃)₂ and demonstrate that spontaneous ferroelectric order sets in below 340 K, which coexists with ferromagnetic ordering below 13 K. We use X-ray diffraction to show that the electric polarization results from the spatial ordering of hydrogen bonds that link the organic block comprised of phenylethylammonium cations to the inorganic copper chloride block. The hydrogen bond ordering is driven by buckling of the corner-linked copper chloride octahedra. Because the magnetic exchange pathways are also determined by this octahedral buckling, a potentially large magnetoelectric coupling is induced. Our results imply that such hybrids form a new family of multiferroic materials.

Keywords:

multiferroic; ferroelectric; ferromagnetic; organic鈭抜norganic hybrid; metal-oxide framework