Influence of Magnetic Field upon the Conductance of a Unicomponent Crystal of a Tetrathiafulvalene-Based Nitronyl Nitroxide

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• 作者：Hideji Komatsu ; Michio M. Matsushita ; Shigefumi Yamamura ; Yoko Sugawara ; Kentaro Suzuki ; Tadashi Sugawara
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：April 7, 2010
• 年：2010
• 卷：132
• 期：13
• 页码：4528-4529
• 全文大小：140K
• 年卷期：v.132,no.13(April 7, 2010)
• ISSN：1520-5126

文摘

A spin-polarized donor, BTBN, which is a dibromotetrathiafulvalene derivative containing a nitronyl nitroxide group in a cross-conjugated manner, was prepared. Upon hole injection from an electrode, the neutral microcrystals of BTBN exhibited nonlinear I−V characteristics that were interpreted in terms of the space-charge-limited conduction (SCLC) mechanism. Moreover, the resistance of BTBN decreased upon application of a magnetic field below 30 K and exhibited a giant negative magnetoresistance of (R_H − R₀)/R₀ = −76% at 2 K under 5 T. These results show that the transport of carriers in the neutral unicomponent radical crystal can be controlled by the external magnetic field. These findings are important as a basis for developing molecule-based spin electronic devices.