Abstract
We report the results of magnetic measurements on the orthorhombic alkalimetal fulleride Rb 1 C 60 . Measurements of the NMR relaxation T 1 and ESR spin susceptibility under pressure (P ≤ 5 kbar) provide clear evidence for the importance of electron correlations in this phase at variance with superconducting phase 3 fullerides. We show that spin fluctuations (ferromagnetic) persisting up to room temperature order antiferromagnetically at low temperature and give rise to long range order below 15 K. These results support the band structure calculation describing this polymerised phase by a three-dimensional model. The magnetic ground state is suppressed by a pressure exceeding 6 kbar and gives rise to a conducting phase at 12 kbar whose susceptibility is still possibly enhanced by magnetic fluctuations.
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