Evidence for Strong π-d Interaction in β-(EDT-DSDTFVSDS)_2FeBr_4(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
スポンサーリンク
概要
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Electronic properties of the π-d system β-(EDT-DSDTFVSDS)_2FeBr_4 are investigated, where EDT-DSDTFVSDS=ethylenedithiodiselenadithiafulvalenothioquinone-1, 3-diselenolemethide. Clear contrast between the FeBr_4 salt and the nonmagnetic anion analogue salt, β-(EDT-DSDTFVSDS)_2GaBr_4, was observed in the electrical resistance and magnetoresistance (MR). The FeBr_4 salt exhibits a giant negative MR of 85% at 0.7K and 14T. Furthermore, MR of the FeBr_4 salt has a deep and sharp dip anomaly associated with the spin flop of the d spin at around 1.8T below Neel temperature T_<Nd>=3.3K. A model calculation, based on the assumption that antiferromagnetic arrangement of the d spins enhances an insulating state, qualitatively reproduced the experimental result. These results demonstrate the strong π-d interaction in the FeBr_4 salt. Further, it is remarkable that in the higher angle of magnetic field from the easy axis, two anomalies associated with spin flop were observed. This behavior is neither explained by the conventional three-dimensional Ising nor XY models. The magnetic susceptibility of the FeBr_4 salt obeys the Curie-Weiss law without a peak, which is characteristic of the usual low-dimensional antiferromagnet at higher temperature than Neel temperature.
- 社団法人日本物理学会の論文
- 2008-01-15
著者
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Murata K
Department Of Organic And Polymeric Materials Tokyo Institute Of Technology
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Honda Y
Tohoku Univ. Sendai
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Yoshino Harukazu
Department Of Material Science Faculty Of Science Osaka City University
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Murata Keizo
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Murata K
Electrotechnical Laboratory
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Murata K
Department Of Material Science Graduate School Of Science Osaka City University
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Murata Keizo
Osaka City University
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Yasuzuka Syuma
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Maruyama K
Faculty Of Science Niigata University
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Maruyama K
Department Of Physics Faculty Of Science Kyoto University
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MURATA Kazuhiro
Electrotechnical Laboratory
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FUJIWARA Hideki
Department of Chemistry, Graduate School of Science, Osaka Prefecture University and CREST, JST
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SUGIMOTO Toyonari
Department of Chemistry, Graduate School of Science, Osaka Prefecture University and CREST, JST
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Murata Kazuhiro
Department Of Physics Division Of Material Science Nagoya University
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Murata K
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Murata K
Tokyo Medical And Dental Univ. Tokyo Jpn
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Yoshino Hajime
Institute For Solid State Physics The University Of Tokyo
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Sugimoto Toyonari
Department Of Chemistry Graduate School Of Science Osaka Prefecture University
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Sugimoto Toyonari
Department Of Chemistry Graduate School Of Science Osaka Prefecture University And Crest Jst
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Fujiwara Hideki
Department Of Chemistry Graduate School Of Science Osaka Prefecture University
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Fujiwara Hideki
Institute For Molecular Science
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MATSUTANI Katsuhiro
Tokuyama Soda Co. Ltd.
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Murata Keiichi
Department Of Neurophysiology Medical Research Institute Tokyo Medical And Dental University
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HAYASHI Toshiki
Department of Chemistry, Graduate School of Science, Osaka Prefecture University
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FUJIMOTO Tsutomu
Division of Molecular Materials Science, Graduate School of Science, Osaka City University
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YOKOGAWA Keiichi
Division of Molecular Materials Science, Graduate School of Science, Osaka City University
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YOSHINO Harukazu
Division of Molecular Materials Science, Graduate School of Science, Osaka City University
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Hayashi Toshiki
Department Of Chemistry Graduate School Of Science Osaka Prefecture University
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Yoshino H
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Yoshino Harukazu
Department Of Material Science Graduate School Of Science Osaka City University
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Fujimoto Tsutomu
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Yokogawa Keiichi
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Yoshino H
Graduate School Of Science Osaka City University
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Yoshino Harukazu
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Honda Y
Osaka Univ. Suita Jpn
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Yasuzuka Syuma
Osaka City Univ. Osaka
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Maruyama Kenji
Graduate School of Science, Osaka City University
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