Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-02-29
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 ps figures
Scientific paper
Electron Spin Resonance and optical reflectivity measurements demonstrate a metal-insulator transition in Na_2CsC_60 as the system passes from the low temperature simple cubic to the high temperature {\it fcc} structure above 300 K. The non-conducting electronic state is especially unexpected in view of the metallic character of other, apparently isostructural fullerides, like K_3C_60. The occurence of this phase in Na_2CsC_60 suggests that alkali specific effects can not be neglected in the description of the electronic properties of alkali doped fullerides. We discuss the origin of the insulating state and the relevance of our results for the anomaly observed in the magnitude of the superconducting transition temperature of Na_2AC_60 fullerides.
Brouet Veronique
Cegar Natasa
Degiorgi Leonardo
Forró László
Garaj Slaven
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