The zero-field muon-spin-relaxation (ZF-micro(+)SR) technique provides direct observation of the development of antiferromagnetic long range order in the hyperexpanded methylaminated fulleride salt, (CH(3)NH(2))K(3)C(60) below T(N) approximately 10 K-coherent ordering of the electronic magnetic moments leads to a local field of approximately 25 G at the muon site at 1.2 K.
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