Role of dynamic Jahn-Teller distortions in Na2C60 and Na2CsC60 studied by NMR
V. Brouet, H. Alloul, T. N. Le, S. Garaj, L. Forro
Abstract
Through 13C NMR spin lattice relaxation (T1) measurements in cubic Na2C60, we detect a gap in its electronic excitations, similar to that observed in tetragonal A4C60. This establishes that Jahn-Teller distortions (JTD) and strong electronic correlations must be considered to understand the behaviour of even electron systems, regardless of the structure. Furthermore, in metallic Na2CsC60, a similar contribution to T1 is also detected for 13C and 133Cs NMR, implying the occurence of excitations typical of JT distorted C602- (or equivalently C604-). This supports the idea that dynamic JTD can induce attractive electronic interactions in odd electron systems.
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