Stable metallic behavior and antiferromagnetic ordering of Fe(III) d spins in (EDO-TTFVO)2.FeCl4 |
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Authors: | Fujiwara Hideki Wada Kenji Hiraoka Takashi Hayashi Toshiki Sugimoto Toyonari Nakazumi Hiroyuki Yokogawa Keiichi Teramura Masayasu Yasuzuka Syuma Murata Keizo Mori Takehiko |
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Institution: | Department of Chemistry, Osaka Prefecture University, Osaka 599-8570, Japan. hfuji@c.s.osakafu-u.ac.jp |
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Abstract: | We report the crystal structure and physical properties of the 2:1 FeCl4- salt of a new donor molecule, EDO-TTFVO. Crystal structure analysis of this salt revealed that the donor molecules formed a beta' '-type two-dimensional conducting layer, and there is a short S...Cl contact between the donor molecules and the FeCl4- ions, which is expected to mediate a strong pi-d interaction. This salt showed a stable metallic conducting behavior down to 0.3 K and an antiferromagnetic ordering at TN approximately 3.0 K, indicating that this salt becomes a new antiferromagnetic molecular metal at ambient pressure. The appearance of the magnetic ordering is considered to originate from the strong pi-d interactions between the donor molecules and the FeCl4- ions because the field dependence of magnetoresistances was remarkably affected below the antiferromagnetic transition temperature. |
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