Crystal Structure and Magnetic Properties of the S = 1/2 Quantum Spin System Cu7(TeO3)6F2 with Mixed Dimensionality

详细信息    查看全文

• 作者：Shichao Hu ; Amber Mace ; Mats Johnsson ; Vladimir Gnezdilov ; Peter Lemmens ; Joshua Tapp ; Angela M枚ller
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：July 21, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：7661-7667
• 全文大小：398K
• ISSN：1520-510X

文摘

The new oxofluoride Cu₇(TeO₃)₆F₂ has been synthesized by hydrothermal synthesis. It crystallizes in the triclinic system, space group P1̅. The crystal structure constitutes a Cu鈥揙 framework with channels extending along [001] where the F^{鈥?/sup> ions and the stereochemically active lone-pairs on Te4+ are located. From magnetic susceptibility, specific heat, and Raman scattering measurements we find evidence that the magnetic degrees of freedom of the Cu鈥揙鈥揅u segments in Cu₇(TeO₃)₆F₂ lead to a mixed dimensionality with single Cu S = 1/₂ moments weakly coupled to spin-chain fragments. Due to the weaker coupling of the single moments, strong fluctuations exist at elevated temperatures, and long-range magnetic ordering evolves at comparably low temperatures (T_N = 15 K).}