Low temperature magnetic instabilities in triply charged fulleride polymers
The electronic properties of the C3-60 polymer in Na2Rb0.3Cs0.7C60 were studied by X-band and high field (109.056 GHz) ESR. They are characteristic of a strongly correlated quasi-one-dimensional metal down to 45 K. On further cooling, a pseudogap of magnetic origin opens at the Fermi level below 45 K with three-dimensional magnetic ordering occurring below T(N) approximately 15 K, as confirmed by the observation of an antiferromagnetic resonance mode. The Na2Rb1-xCsxC60 family of polymers offers a unique way to chemically control the electronic properties, as the opening of the gap in this system of predominantly itinerant electrons is an extremely sensitive function of the interchain separation.
Ar&cbreve;on
D
Fullerene Science Centre, School of Chemistry, Physics and Environmental Sciences, University of Sussex, Brighton, BN1 9QJ, United Kingdom.
Prassides
K
Maniero
AL
Brunel
LC