Negatively Charged Muonium and Related Centers in Solids

Abstract

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.

9 pages, 6 figures, review article

References in corpus (5)

• Hydrogen in layered iron arsenide: indirect electron doping to induce superconductivity
• Muon-fluorine entangled states in molecular magnets
• Direct spectroscopic observation of a shallow hydrogen-like donor state in insulating SrTiO${}_3$
• Excited configurations of hydrogen in the BaTiO${}_{3-x}$H${}_x$ perovskite lattice associated with hydrogen exchange and transport
• Polaronic nature of a muonium-related paramagnetic center in SrTiO${}_3$

Cited by in corpus (5)

• Muon sites in PbF2 and YF3: decohering environments and the role of anion Frenkel defects
• Understanding muon diffusion in perovskite oxides below room temperature based on harmonic transition state theory
• Hydrogen-Ti${}^{3+}$ Complex as a Possible Origin of Localized Electron Behavior in Hydrogen-Irradiated SrTiO${}_3$
• Nano-scale dynamics of hydrogen in VO${}_2$ studied by $\mu$SR
• Electron $g$-value comparison of paramagnetic muonium and hydrogen centers in rutile TiO${}_2$