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The effect of molecular valence on the superconducting transition temperature is studied in a new family of fulleride superconductors Na 2 Cs x C 60 , 0<x<1. By varying the octahedral Cs occupancy, we can for the first time chemically tune the carrier concentration in an isostructural sequence of single-phase solid solutions. These all exhibit orientational phase...
The high-temperature f.c.c. phase of KC 60 is unstable upon cooling and transforms into the orthorhombic polymer (OP). We show in this paper that the polymeric phase is also unstable above room temperature and separates into the thermodynamically stable K 3 C 60 + α-C 60 phases. The analysis of the lifetime of both f.c.c. and polymeric phases, probed...
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