Negatively Charged Muonium and Related Centers in Solids
Abstract
Muonium (Mu) centers formed upon implantation of μ+ 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 SrTiO3-x, and BaTiO3-xHx oxyhydride.
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