2019年12月24日
Negative ionic states of tin in the oxide superconductor Sr3−xSnO revealed by Mössbauer spectroscopy
Physical Review B
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- 巻
- 100
- 号
- 24
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.100.245145
- 出版者・発行元
- AMER PHYSICAL SOC
We report the temperature variation of the Sn-119-Mossbauer spectra of the antiperovskite (inverse perovskite) oxide superconductor Sr3-xSnO. Both superconductive (Sr deficient) and nonsuperconductive (nearly stoichiometric) samples exhibit major gamma-ray absorption with an isomer shift similar to that of Mg2Sn. This fact shows that Sr3-xSnO contains the metallic anion Sn4-, which is rare, especially among oxides. In both samples, we observed another gamma-ray absorption with a larger isomer shift, indicating that there is another ionic state of Sn with a higher oxidation number. The temperature dependence of the absorption intensities reveals that the Sn ions exhibiting larger isomer shifts have a lower energy of the local vibration. The larger isomer shift and lower vibration energy are consistent with the values estimated from the first-principles calculations for hypothetical structures with various Sr-deficiency arrangements. Therefore, we conclude that the additional gamma-ray absorptions originate from the Sn atoms neighboring the Sr deficiency.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.100.245145
- ISSN : 2469-9950
- eISSN : 2469-9969
- ORCIDのPut Code : 66470177
- Web of Science ID : WOS:000504446200006