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Negatively charged muonium and related centers in solids

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

Muonium (Mu) centers formed upon implantation of $$mu^+$$ in a solid have long been investigated as an experimentally accessible model of isolated hydrogen impurities. Recent discoveries of hydridic centers formed at oxygen vacancies have stimulated a renewed interest in H$$^-$$ and corresponding Mu$$^-$$ centers in oxides. However, the two diamagnetic centers, Mu$$^+$$ and Mu$$^-$$, are difficult to separate spectroscopically. In this review article, we summarize established and developing methodologies for identifying Mu$$^-$$ centers in solids, and review recent Mu studies on said centers supposedly formed in mayenite, oxygen-deficient SrTiO$$_{3-x}$$, and BaTiO$$_{3-x}$$H$$_x$$ oxyhydride.



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Category:Physics, Multidisciplinary



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