Electron spin resonance study of a CuIr2S4 single crystal |
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| Authors: | Lei Zhang Hechang Lei Xiangde Zhu Wei Tong Changjin Zhang Yuheng Zhang |
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| Institution: | 1. High Magnetic Field Laboratory , Chinese Academy of Sciences , Hefei 230031 , China zhanglei@hmfl.ac.cn;3. Condensed Matter Physics and Materials Science Department , Brookhaven National Laboratory, Upton , New York 11973 , USA;4. High Magnetic Field Laboratory , Chinese Academy of Sciences , Hefei 230031 , China |
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| Abstract: | A spinel sulphide CuIr2S4 single crystal, which exhibits an orbitally induced Peierls phase transition at ～230?K, is investigated by electron spin resonance (ESR) spectroscopy. The phase transition is clearly manifested on the ESR spectra. It is suggested that the ESR signals are produced by a few non-dimerized Ir4+ ions. Moreover, an extra ESR spectrum appears at low temperature in addition to the paramagnetic ESR signals of Ir4+ ions, which is suggested to be caused by the Jahn–Teller effect of the non-dimerized Ir4+ ions. From the ESR results, it is found that the Jahn–Teller splitting energy ΔE JT is much smaller than the spin-dimerization gap. |
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| Keywords: | spinel sulphide CuIr2S4 orbital-induced Peierls phase transition |
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