Abstract
We report calculations of the positron potential and wave function in LaFeAsO. These calculations show that the positron wave function does sample the entire unit cell, although it is largest in the interstices of the La layer adjacent to As atoms. The implication is that annihilation correlation of annihilation radiation is a viable probe of the Fermi surfaces in this material. The results also apply to positive muons and indicate that these will be localized in the La layer adjacent to As.
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