Investigations of Crystal and Magnetic Structure of 'Star' Antiferromagnet C42D83Fe9O55
The interplay of lattice geometry and magnetic interactions may lead to interesting magnetic phenomena, such as magnetic frustration. As an analog of the kagome lattice, the so-called star lattice has also shown strong spin frustration when it hosts antiferromagnetically coupled spins. A star lattice, formulated as C42D83Fe9O55, has been synthesized by connecting cationic iron(III) carboxylates with acetate bridges. The Fe3+ ions in the anionic layers form a star lattice. The DC susceptibility yields a Curie-Weiss temperature of -581 K, indicating a strong antiferromagnetic exchange. The significant increase of DC susceptibility below 4.5 K in a field of 0.005 T indicates the presence of both canted antiferromagnetism and long-range magnetic order below 4.5 K. The occurrence of magnetic order below 4.5 K is further confirmed by the sharp peaks observed in both the real and the imaginary components of the AC susceptibility. In order to determine the detailed crystal structure and explore the nature of the long-range magnetic order at 4.5 K, it is proposed to perform neutron powder diffraction measurements on D2B at ILL.
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FU Zhendong; BRUECKEL Thomas; SUARD Emmanuelle and ZHENG Yan-Zhen. (2013). Investigations of Crystal and Magnetic Structure of 'Star' Antiferromagnet C42D83Fe9O55. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2271
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