Magnetic and Thermal Properties of λ-(BETS)_2FeCl_4 System-Fe 3d Spin in Antiferromagnetic Insulating Phase
Magnetic and Thermal Properties of λ-(BETS)_2FeCl_4 System-Fe 3d Spin in Antiferromagnetic Insulating Phase
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反铁磁绝缘相λ-(BETS)_2FeCl_4体系-Fe 3d自旋的磁热性能
DOI：
10.1143/jpsj.80.063601
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发表时间：
2011
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影响因子：
--
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et al
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文献类型：
--
作者：
H.Akiba;et al
准二维有机导体λ-（BETS）2FeCl 4 [BETS = bis（ethylenedithio）tetraselenafulvalene]在零磁场下表现出从顺磁金属（PM）到反铁磁绝缘体（AFI）的新型相变，相变温度（TMI）为8.3K.我们研究了它的热力学性质，发现它的比热有一个六能级肖特基峰，磁化率在TMI以下有一个宽肩。这些反常现象可以用一个新的模型来解释，在这个模型中，3d自旋保持顺磁态，而π自旋保持反铁磁态。
A quasi-two-dimensional organic conductor λ-(BETS)2FeCl4[BETS = bis(ethylenedithio)tetraselenafulvalene] exhibits a new type of phase transition from a paramagnetic metal (PM) to an antiferromagnetic insulator (AFI) at a transition temperature (TMI) of 8.3 K under zero magnetic field. We studied its thermodynamic properties and found a six-level Schottky hump in its specific heat and a broad shoulder in its magnetic susceptibility belowTMI. These anomalies are explained by a new model in which the 3dspin maintains the paramagnetic states against the antiferromagnetic ordering of the π spin.