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arXiv 0706.0265cond-mat.str-elcond-mat.mtrl-sci
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铁磁莫特绝缘体GaV4S8的热力学性质

Thermodynamic Properties of Ferromagnetic Mott- Insulators GaV4S8

C. S. Yadav, A. K. Nigam, A. K. Rastogi

摘要:

本文报道了V_4四面体团簇化合物GaV_4S_8在2 ~ 300 K之间的磁性和比热测量结果。我们发现两个转变相关的结构变化在42 K,然后在12 K的铁磁顺序冷却。以前报道的簇合物的钼4显着相似的性能。这些化合物在其电子性质中显示出极高密度的低能激发。我们解释了这种行为在一个集群化合物由于电子之间的库仑斥力,占据高度简并轨道的不同集群的减少。

英文摘要:

We present the results of the magnetic and specific heat measurements on V4 tetrahedral-cluster compound GaV4S8 between 2 to 300K. We find two transitions related to a structural change at 42K followed by ferromagnetic order at 12K on cooling. Remarkably similar properties were previously reported for the cluster compounds of Mo4. These compounds show an extremely high density of low energy excitations in their electronic properties. We explain this behavior in a cluster compound as due to the reduction of coulomb repulsion among electrons that occupy highly degenerate orbits of different clusters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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