Abstract
A resonant enhancement of muon spin relaxation has been observed at a field where the muonium Zeeman splitting crosses a Van Hove singularity in the small polaron band for interstitial muonium in potassium chloride. This feature is predicted only for muonium in a coherent state near the bottom of the band and thus clearly establishes that a light interstitial atom such as muonium can exist in a Bloch state in an ordered crystalline host at low temperature.
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