Two-Step Suppression of Charge Disproportionation in CaCu3Fe4O12 under High Pressure
| Autor: | Kana Kobayashi, Masaichiro Mizumaki, Takateru Kawakami, Naohisa Hirao, Yoshihiro Sekiya, Naomi Kawamura, Naoaki Hayashi, Ayano Mimura, Yasuo Ohishi, Yuichi Shimakawa, Mikio Takano, Keita Tokumichi, Naoki Ishimatsu, Ikuya Yamada |
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| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Materials science Absorption spectroscopy Analytical chemistry Oxide General Physics and Astronomy Disproportionation 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Metal chemistry.chemical_compound Nuclear magnetic resonance Electrical resistance and conductance chemistry visual_art 0103 physical sciences Mössbauer spectroscopy visual_art.visual_art_medium 010306 general physics 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of the Physical Society of Japan. 85:034716 |
| ISSN: | 1347-4073 0031-9015 |
| Popis: | The electronic properties of a perovskite Fe4+ oxide, CaCu3Fe4O12, pressurized in a diamond anvil cell at pressures up to 50 GPa, were investigated by X-ray diffraction, electrical resistance measurements, X-ray absorption spectroscopy, and 57Fe Mossbauer spectroscopy. The first transformation from a charge-disproportionated (Fe3+ and Fe5+) semiconducting high-spin state to an approximately charge-uniform (Fe(4−δ)+ and Fe(4+δ)+) metallic high-spin state occurred at ∼15 GPa. This was followed by a second transformation to a completely charge-uniform (Fe4+) metallic low-spin state at ∼30 GPa. This is the first observation of pressure-induced two-step suppression of charge disproportionation in perovskite iron oxides. |
| Databáze: | OpenAIRE |
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