Local magnetic susceptibility of the muon in the S=1/2V15 molecular nano-magnet

We report muon spin rotation measurements of the local magnetic susceptibility around a positive muon in the V15V15 spin 1/21/2 molecular nano-magnet. We find that the measured temperature dependence of the local susceptibility agrees with bulk. No temperature dependence is observed below 200 mK, indicating that at these temperatures the V15V15 molecular spin resides in its S=12 ground state.