Paramagnetic Phase of a Heavy-Fermion Compound, CeFePO, Probed by 57Fe Mössbauer Spectroscopy
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概要
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57Fe Mössbauer spectroscopy was applied to an iron-based layered compound CeFePO. At temperatures from 9.4 to 293 K, no magnetic splitting was observed in the Mössbauer spectra of CeFePO indicating a paramagnetic phase of the Fe magnetic sublattice. All the spectra were fitted with a small quadrupole splitting, and the Debye temperature of CeFePO was found to be {\sim}448 K. The isomer shift at room temperature, 0.32 mm/s, was almost equal to those of LnFeAsO (Ln = La, Ce, Sm). Comparing s-electron density using the isomer shifts and unit cell volumes, it was found that the Fe of CeFePO has a similar valence state to other layered iron-based quaternary oxypnictides except LaFePO.
- 2012-06-15
著者
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EINAGA Yasuaki
Department of Applied Chemistry, Keio University
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Kamihara Yoichi
Department Of Applied Physics And Physico-informatics Faculty Of Science And Technology Keio Univers
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Matoba Masanori
Department Of Applied Physics And Physico-informatics Faculty Of Science And Technology Keio Univers
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Yamamoto Takashi
Department Of Applied Chemistry Faculty Of Engineering Ehime University
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Nakamura Tetsuro
Department of Applied Physics and Physico-Informatics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Kamihara Yoichi
Department of Applied Physics and Physico-Informatics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Yamamoto Takashi
Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Matoba Masanori
Department of Applied Physics and Physico-Informatics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Einaga Yasuaki
Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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