Anomalous metallicity and electronic phase separation in the CsC60 polymerized fulleride - art. no. 125410

Cs-133 and C-13-NMR have been used to study the electronic properties of th e polymerized phase of CsC60 at ambient and under hydrostatic pressure. The salient result of this study is the finding of fluctuations in the local f ield at Cs-133 site, which are independent of the applied pressure and due to thermally activated changes in the local electronic environment of Cs-13 3 nuclei. We establish that the phase separation between magnetic and nonma gnetic domains observed in the low-temperature state at ambient pressure is the result of a slowing down of these fluctuations likely related to polar onic-charge excitations on the polymers.