Electron spin resonance study of the polymeric phase of Na2RbC60

The structural and electronic properties of the polymeric phase of ${\mathrm{Na}}_{2}{\mathrm{RbC}}_{60}$ which comprises of C-C bridged ${C}_{60}^{3\ensuremath{-}}$ chains have been studied between 410 and 4 K with the electron spin resonance (ESR) technique. On cooling, the polymeric phase starts growing below \ensuremath{\sim}250 K. Its fraction reaches a maximum at \ensuremath{\sim}190 K, where around 55% of the monomeric cubic phase have transformed to the polymer. The temperature dependence of the ESR susceptibility suggests that the ${\mathrm{Na}}_{2}{\mathrm{RbC}}_{60}$ polymer is conducting down to 4 K. The ESR results exclude the possibility of the existence of a ground-state instability and the formation of either a spin-density-wave (SDW) or a charge-density-wave (CDW) state.

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