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The ammoniation of lithium-doped C 60 gives rise to (NH 3) 6 Li x C 60, a system which is chemically expanded while maintaining C 60 original cubic symmetry and hence the threefold degeneracy of the C 60 x-frontier orbitals. Nevertheless, the on-site repulsion U dominates the bandwidth W and, by overcoming the effect of orbital degeneracy, brings to electron localisation. Muon-spin relaxation (μ SR) and SQUID magnetometry were used to confirm the presence of a magnetically ordered phase at low temperatures, already reported by Durand and co-workers [Nat. Mater. 2 (2003) 605]. Surprisingly, neither the expected antiferromagnetism nor the even-odd effect on electron band filling were observed down to 2 K.
Publication date: 
31 Mar 2006

M Riccò, M Belli, T Shiroka, D Pontiroli, M Pagliari, F Gianferrari, A Gorreri

Biblio References: 
Volume: 374 Pages: 255-258
Physica B: Condensed Matter