当前位置：
X-MOL 学术
›
Inorg. Chem.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Rotating Magnetocaloric Effect in an Anisotropic Two-Dimensional CuII[WV(CN)8]3– Molecular Magnet with Topological Phase Transition: Experiment and Theory
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2017-09-15 00:00:00 , DOI: 10.1021/acs.inorgchem.7b01930 Piotr Konieczny 1 , Robert Pełka 1 , Dominik Czernia 2 , Robert Podgajny 3
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2017-09-15 00:00:00 , DOI: 10.1021/acs.inorgchem.7b01930 Piotr Konieczny 1 , Robert Pełka 1 , Dominik Czernia 2 , Robert Podgajny 3
Affiliation
|
Conventional (MCE) and rotating (RMCE) magnetocaloric effects have been explored in the two-dimensional (2D) coordination polymer {(tetren)H5)0.8CuII4[WV(CN)8]4·7.2H2O}n (WCu-t; tetren = tetraethylenepentamine). The unusual magnetostructural properties were exploited, including the bilayered Prussian Blue like coordination skeleton and the XY easy-plane magnetic anisotropy based on the in-plane correlation between WV and CuII spins of 1/2, underlying the Berezinskii–Kosterlitz–Thouless (BKT) topological phase transition to the long-range-ordered state at TC = 33 K. The magnetic properties were studied on single crystals along the H∥ac easy plane and H∥b hard axis. The maximal entropy change for MCE for easy-plane geometry at 38.0 K and the magnetic field change μ0ΔH = 7.0 T reached ∼4.01 J K–1 kg–1. The strong magnetic anisotropy was used to study the RMCE in which the maximal entropy change was observed at 35.5 K for 7.0 T, attaining 1.81 J K–1 kg–1. Moreover, easy-plane anisotropy introduces the inverse magnetocaloric effect for H∥b, which enhances the RMCE by up to 47%. This observation was confirmed by a theoretical investigation considering the XY model using a molecular field and cluster variational method in the pair approximation approach, dedicated to the bilayered systems with the adequate nearest neighbor number z = 5 and spin S = 1/2.
中文翻译：
具有拓扑相变的各向异性二维Cu II [W V（CN）8 ] 3–分子磁体中的旋转磁热效应：实验和理论
在二维（2D）配位聚合物{（tetren）H 5）0.8 Cu II 4 [W V（CN）8 ] 4 ·7.2H 2 O}中已经探索了常规的（MCE）和旋转的（RMCE）磁热效应。n（WCu-t； tetren ＝四亚乙基五胺）。这种不寻常的magnetostructural性质被利用，包括双层普鲁士蓝等协调骨架与XY基于所述易面内磁各向异性的面内W之间的相关性V和Cu II的自旋1 / 2，下方的Berezinskii-科斯特利茨-Thouless（BKT）拓扑相转变到在长程有序状态Ť Ç = 33 K的磁特性进行了研究沿着单晶ħ ∥交流容易平面和ħ ∥ b难轴。在38.0 K中MCE最大熵变，便于平面外几何形状和磁场变化μ 0 Δ ħ = 7.0Ť达到~4.01 JK -1千克-1。利用强磁各向异性研究了RMCE，其中在35.5 K下7.0 T观察到最大熵变化，达到1.81 JK –1 kg –1。此外，容易平面内各向异性引入了对逆磁热效应ħ ∥ b，这增强了高达47％的RMCE。该观察结果通过理论调查考虑确认XY利用在一对近似方法的分子场和簇变分法的模式，专用于与适当的最近邻的数目双层系统Ž = 5和自旋小号= 1 / 2。
更新日期：2017-09-15
中文翻译：
具有拓扑相变的各向异性二维Cu II [W V（CN）8 ] 3–分子磁体中的旋转磁热效应：实验和理论
在二维（2D）配位聚合物{（tetren）H 5）0.8 Cu II 4 [W V（CN）8 ] 4 ·7.2H 2 O}中已经探索了常规的（MCE）和旋转的（RMCE）磁热效应。n（WCu-t； tetren ＝四亚乙基五胺）。这种不寻常的magnetostructural性质被利用，包括双层普鲁士蓝等协调骨架与XY基于所述易面内磁各向异性的面内W之间的相关性V和Cu II的自旋1 / 2，下方的Berezinskii-科斯特利茨-Thouless（BKT）拓扑相转变到在长程有序状态Ť Ç = 33 K的磁特性进行了研究沿着单晶ħ ∥交流容易平面和ħ ∥ b难轴。在38.0 K中MCE最大熵变，便于平面外几何形状和磁场变化μ 0 Δ ħ = 7.0Ť达到~4.01 JK -1千克-1。利用强磁各向异性研究了RMCE，其中在35.5 K下7.0 T观察到最大熵变化，达到1.81 JK –1 kg –1。此外，容易平面内各向异性引入了对逆磁热效应ħ ∥ b，这增强了高达47％的RMCE。该观察结果通过理论调查考虑确认XY利用在一对近似方法的分子场和簇变分法的模式，专用于与适当的最近邻的数目双层系统Ž = 5和自旋小号= 1 / 2。
京公网安备 11010802027423号