American Physical Society, Physical review B, 10(86)
DOI: 10.1103/physrevb.86.104428
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We present pulsed electron-nuclear double resonance (ENDOR) experiments which enable us to characterize the coupling between bismuth donor spin qubits in Si and the surrounding spin bath of Si-29 impurities which provides the dominant decoherence mechanism (nuclear spin diffusion) at low temperatures (