Field Induced Spin-State Transition in LaCoO3
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概要
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The magnetization of LaCoO3 shows a magnetic transition induced by level crossing at a magnetic field of 60 T below 25 K, which is consistent with the energy diagram determined from electron spin resonance experiments. However, the amount of Co ions with $g = 3.35$ contributing to the magnetic transition is sample-dependent and at most 14% of the total Co ions in LaCoO3. We found that the rest of the Co ions also contribute to the magnetization, which is a maximum at around 100 K. We analyzed the magnetization assuming two kinds of Co species, CoI and CoII, both of which have the nonmagnetic ground state. The energies and the $g$ values of the magnetic excited states are 135 K and 3.35 for CoI, and 250–260 K and 1.9–2.0 for CoII, respectively. CoI ions are suggested to be associated with oxygen vacancies and the surface of LaCoO3.
- 2009-09-15
著者
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SATO Keisuke
Institute for Solid State Physics, University of Tokyo
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Kindo Koichi
Institute For Solid State Physics The University Of Tokyo
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Asai Kichizo
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Kobayashi Yoshihiko
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Matsuo Akira
Institute For Chemical Research Kyoto University
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Matsuo Akira
Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581
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Sato Keisuke
Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581
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