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- W2015687434 abstract "Low-temperature positron annihilation measurements have been performed on MgO single crystals containing either cation or anion vacancies. The temperature dependence of the S parameter is explained in terms of metastable self-trapped positrons which thermally hop through the crystal lattice. The experimental results are analyzed using a three-state trapping model assuming transitions from both delocalized and self-trapped states to deep trapped states at vacancies. The energy level of the self-trapped state was determined to be (62ifmmodepmelsetextpmfi{}5) meV above the delocalized state. The activation enthalpy for the hopping process of self-trapped positrons appears to depend on the kind of defect present in the crystals." @default.
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- W2015687434 date "1997-01-01" @default.
- W2015687434 modified "2023-10-12" @default.
- W2015687434 title "Metastable self-trapping of positrons in MgO" @default.
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- W2015687434 doi "https://doi.org/10.1103/physrevb.55.243" @default.
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