Evidence of Charge Disproportionation in $\lambda$ Type BETS Based Organic Superconductors
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概要
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We performed 77Se NMR mesurements to investigate the electronic properties of the two dimensional BETS layers of the organic superconductor, $\lambda$-(BETS)2GaCl4, which is isostructural with the field induced superconductor, $\lambda$-(BETS)2FeCl4. The broadening of NMR spectrum at low temperatures was confirmed to be due to charge disproportionation in the two dimensional BETS conducting layer in the Ga compound as it was in the Fe compound [J. Phys. Soc. Jpn. 76 (2007) 124708]. From the analysis of the anisotropy of central shift and linewidth, we estimated that degree of charge disproportionation in the Ga salt is about half as large as that observed in the Fe salt. The present result clearly confirms that the magnetic Fe ions are not responsible for the broadening and that a charge disproportionated matallic state exists in the close vicinity of the superconducting phase of the Ga salt.
- 2010-07-15
著者
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UJI Shinya
National Institute for Materials Science
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TANAKA Hisashi
National Institute of Advanced Industrial Science and Technology (AIST)
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Berthier Claude
Grenoble High Magnetic Field Laboratory Centre National De La Recherche Scientifique:laboratoire De
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Hiraki Ko-ichi
Department Of Physics Gakushuin University
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Kobayashi Hayao
Department Of Chemistry Faculty Of Science Toho University
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Takahashi Toshihiro
Department Of Applied Biology Kyoto Institute Of Technology
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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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Horvatic Mladen
Grenoble High Magnetic Field Lab. Grenoble Fra
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Tanaka Hisashi
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8561, Japan
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Takahashi Toshihiro
Department of Physics, Gakushuin University, Toshima, Tokyo 171-8588, Japan
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Kitahara Masatsugu
Department of Physics, Gakushuin University, Toshima, Tokyo 171-8588, Japan
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Mayaffre Hadrien
Grenoble High Magnetic Field Laboratory, BP166, 38042 Grenoble, Cedex 9, France
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Berthier Claude
Grenoble High Magnetic Field Laboratory, BP166, 38042 Grenoble, Cedex 9, France
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TAKAHASHI Toshihiro
Department of Animal Science, Faculty of Agriculture, Tohoku University
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