Thermodynamic properties of molecular quantum-magnets by series expansion

通过级数展开研究分子量子磁体的热力学性质

• 批准号: 5369281
• 负责人: Professor Dr. Stefan Süllow
• 金额: --
• 依托单位: Institut für Mathematische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5369281?language=en
• 关键词: Thermodynamic; properties; molecular; quantum; magnets

This project is devoted to a combined experimental and theoretical study of the correlation between the magnetism and structure of supramolecular solids. We intend to investigate this correlation along three lines. First, external pressure up to 1 GPa will be used to analyze both, the elastic and inelastic neutron scattering response, and moreover the magnetic susceptibility upon tuning through a pressure induced ferro/antiferromagnet transition in the quasi two-dimensional compound (CH3NH3)2CuCl4. Second, we will investigate the structure, and the static and dynamic magnetic properties as function of external pressure for the quasi one-dimensional bimetallic chain-compound MnNi(NO2)4(en)2, (en=ethylendiamine) with ferromagnetic intra-chain coupling in order to reveal the pressure sensitivity and the interplay between inter- and intra-chain exchange. Finally we will study the evolution of magnetic correlations as a function of inter-chain coupling in bimetallic systems by considering the magnetism, the quantum-phase diagram, and the spin-dynamics of zig-zag mixed-spin-ladder models.

本计画致力于超分子固体的磁性与结构间相关性的实验与理论研究。我们打算沿着沿着三条线来研究这种相关性。首先，外部压力高达1 GPa将被用来分析两个，弹性和非弹性中子散射响应，而且通过压力诱导的铁/反铁磁过渡的准二维化合物（CH 3 NH 3）2CuCl 4调谐后的磁化率。其次，我们将研究结构，静态和动态磁性能作为外压的函数的准一维链状化合物MnNi（NO2）4（en）2，（en=乙二胺）与铁磁链内耦合，以揭示的压力敏感性和之间的相互作用和链内交换。最后，我们将通过考虑锯齿形混合自旋梯模型的磁性、量子相图和自旋动力学来研究磁关联作为链间耦合函数的演化。