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$$mu^+$$SR as a potential tool for depth-resolved detection of oxygen vacancies in perovskite oxides

ペロブスカイト型酸化物に含まれる酸素空孔の$$mu^+$$SRによる深さ分解検出の可能性

伊藤 孝   ; 髭本 亘  ; 幸田 章宏*; 下村 浩一郎*

Ito, Takashi; Higemoto, Wataru; Koda, Akihiro*; Shimomura, Koichiro*

Oxygen vacancy (V$$_{rm O}$$) is a major defect species in perovskite oxides, having a strong impact on their electrical, optical, and dielectric properties. In spite of its importance, experimental techniques that can directly detect V$$_{rm O}$$ are still limited. Through a series of $$mu^+$$SR measurements on oxygen-deficient SrTiO$$_{3}$$, we revealed that there is a clear positive correlation between the muon spin relaxation rate and the carrier concentration, which is expected to be roughly proportional to the V$$_{rm O}$$ donor concentration. This, together with the variability of muon implantation depth, suggests that $$mu^+$$SR spectroscopy is potentially suitable for depth-resolved analysis of V$$_{rm O}$$ distribution in perovskite oxides, which is complementary to cation vacancy-sensitive techniques, such as positron annihilation spectroscopy.

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