Charge transfer instability in a mixed Ir/Rh honeycomb lattice in Li2Ir1−xRhxO3 solid solution |
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| Institution: | 1. Department of Chemistry, Oregon State University, Corvallis, OR 97331, USA;2. Department of Physics, University of California, Santa Cruz, CA 95064, USA;1. M.N. Miheev Institute of Metal Physics, Russian Academy of Science, 620990, Ekaterinburg, Russia;2. Institute of Natural Sciences, Ural Federal University, 620083, Ekaterinburg, Russia;3. Faculty of Petroleum and Mining Engineering, Suez University, Egypt;1. School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea;2. School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea;1. School of Material Science and Technology, Jiangsu University, Zhenjiang 212013, China;2. School of Metallurgy and Environment, Central South University, Changsha 410083, China;1. Graduate School of Department of Advanced Materials Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea;2. Rapidly Solidified Materials Research Center, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea;3. Graduate School of Energy Science & Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea;4. Rare Metal R&D Group, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-Gu, Incheon 406-130, Korea;5. Advanced Fusion Process R&D Group, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-Gu, Incheon 406-130, Korea;1. Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;2. Laboratory for Microstructures, Shanghai University, Shanghai 200444, China |
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| Abstract: | The solid solution series Li2Ir1-xRhxO3 is synthesized for several values of x between 0 and 1. The compounds possess a monoclinic layered structure (space group C2/m) throughout the solid solution range with the lattice constants following Vegard's relationship. Magnetization and resistivity data below room temperature are presented. The effective magnetic moment (μeff) is reduced below the value obtained by interpolating between the end-members, presumably due to nearest neighbor charge exchange leading to non-magnetic Ir5+/Rh3+ pairs. Surprisingly, the degree of reduction of μeff cannot be explained by a random mixture of Ir and Rh and, in particular, is strongly asymmetric around x = 0.5. This anomalous moment reduction possibly results from the difference in on-site Coulomb repulsion between Ir and Rh ions. |
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| Keywords: | Mott insulators Honeycomb layered structure Spin-orbit coupling Variable range hopping Stacking fault |
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