Millimetre-wave studies on single crystals of the organic radical 2-benzimidazolyl nitronyl nitroxide |
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| Affiliation: | 1. Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK;2. Department of Chemistry, Meiji Gakuin University, Kamikurata, Totsuka-ku, Yokohama 244-8539, Japan;1. Howard Hughes Medical Institute;2. Carnegie Institution, 3520 San Martin Drive, Baltimore, MD 21218, USA;3. Department of Biology, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA;1. Department of Mechatronics, Faculty of Electrical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka Malaysia;2. Department of Mechanical, Faculty of Technology Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka Malaysia;3. Department of Electric and Electronics, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, International Campus Jalan Semarak, 54100 Kuala Lumpur, Malaysia;1. College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;2. Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany;3. School of Physics, Shandong University, Jinan 250100, China |
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| Abstract: | We report temperature dependent millimetre-wave spectroscopic experiments on single crystals of the organic molecular magnet 2-benzimidazolyl nitronyl nitroxide, in the range 1.4–100 K. This organic radical shows quasi one-dimensional (1-d) ferromagnetic intermolecular interactions with the intrachain exchange coupling constant J/kB = +22 K and interchain coupling constant J′/kB = 0.24 K. The linewidth of the electron spin resonance at low temperatures was seen to be considerably broadened as compared to that at higher temperatures. This is consistent with the low dimensional behaviour of the linewidth predicted theoretically. We also see a shift in resonance field at low temperatures. We also present the results of angular dependence experiments carried out at temperatures of 1.4 and 50 K, and frequency dependence experiments at 1.4 and 50 K. |
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