Negative ionic states of tin in the oxide superconductor Sr3−xSnO revealed by Mössbauer spectroscopy
Atsutoshi Ikeda, Shun Koibuchi, Shinji Kitao, Mohamed Oudah, Shingo Yonezawa, Makoto Seto, Yoshiteru Maeno
DOI 10.1103/PhysRevB.100.245145 · Physical Review B
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Abstract
We report the temperature variation of the Sn119-Mössbauer spectra of the antiperovskite (inverse perovskite) oxide superconductor Sr3−xSnO. Both superconductive (Sr deficient) and nonsuperconductive (nearly stoichiometric) samples exhibit major γ-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 γ-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 γ-ray absorptions originate from the Sn atoms neighboring the Sr deficiency.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr3-xSnO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | onset |
| Sr3-xSnO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | onset |
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