Magnetic and Thermal Properties of \lambda-(BETS)2FeCl4 System ---Fe 3d Spin in Antiferromagnetic Insulating Phase---
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概要
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A quasi-two-dimensional organic conductor \lambda-(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 (T_{\text{MI}}) 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 below T_{\text{MI}}. These anomalies are explained by a new model in which the 3d spin maintains the paramagnetic states against the antiferromagnetic ordering of the \pi spin.
- 2011-06-15
著者
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Nishio Yutaka
Department Of Chemistry Faculty Of Science Toho University
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Kajita Koji
Department Of Physics Faculty Of Science Toho University
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Akiba Hiroshi
Department Of Physics Faculty Of Science Toho University
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Shimada Kazuo
Department Of Electronics Engineering Tokyo Metropolitan College Of Aeronautical Engineering
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Kobayashi Hayao
Department Of Chemistry Faculty Of Science Toho University
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Kobayashi Akiko
Department Of Biopharmaceutics Meiji Pharmaceutical University
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Zhou Biao
Department Of Chemistry College Of Humanities And Sciences Nihon University
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Nishio Yutaka
Department of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
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Kajita Koji
Department of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
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Kobayashi Hayao
Department of Humanities and Sciences, Nihon University, Setagaya, Tokyo 156-8550, Japan
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Nobori Kento
Department of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
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Akiba Hiroshi
Department of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
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Kobayashi Akiko
Department of Humanities and Sciences, Nihon University, Setagaya, Tokyo 156-8550, Japan
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Zhou Biao
Department of Humanities and Sciences, Nihon University, Setagaya, Tokyo 156-8550, Japan
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