Substitution effect on metal-insulator transition in Cu(Ir1−xMx)2S4 (M = Sn, Hf) |
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Authors: | Naoto Koseki |
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Affiliation: | Department of Materials Science and Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido, 050-8585 Japan |
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Abstract: | A spinel CuIr2S4 exhibits a temperature-induced metal-insulator (M-I) transition at around 226 K. Non-magnetic substitution effect on the M-I transition, TM-I, in Cu(Ir1−xMx)2S4 (M = Sn, Hf) has been studied on the focus of the rather low composition region of x. Magnetic property of Cu(Ir1−xMx)2S4 (M = Sn, Hf) has been examined experimentally. The TM-I decreases with increasing x and the temperature hysteresis becomes unclear within the experimental errors. The step anomaly in the magnetic susceptibility smears out and the TM-I becomes ill defined around x = 0.20 in Cu(Ir1−xSnx)2S4, and x = 0.10 in Cu(Ir1−xHfx)2S4, respectively. These substitutions play an important role in decoupling the spin-dimerization of Ir4+-Ir4+ in CuIr2S4, and lead the destruction of the metal-insulator transition. |
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Keywords: | Inorganic materials Transition metal alloys and compounds Solid sate reactions Magnetization Magnetic Measurements X-ray diffraction |
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