Evolution of Superconducting and Normal-State Properties in C60 “Polymer” Doped with K
Titel:
Evolution of Superconducting and Normal-State Properties in C60 “Polymer” Doped with K
Auteur:
Grigoryan, L. S. Tokumoto, M.
Verschenen in:
Fullerenes, nanotubes & carbon nanostructures
Paginering:
Jaargang 4 (1996) nr. 1 pagina's 115-129
Jaar:
1996-01-01
Inhoud:
Abstract: Bulk superconductivity was observed in a new iodine-treated aggregated form of solid C60, believed to be a “polymer”, by doping with alkali metal. Evolution of superconducting (Tc = 17.2 K) and normal-state properties, has been studied as a function of doping with K. The normal-state dc susceptibility exhibited a complex behavior with the increasing K uptake, evolving from an enhanced paramagnetism at low doping level, to a weakly temperature-dependent diamagnetism at the optimum doping level for superconductivity, and ending with a strong temperature-independent diamagnetism in over-doped samples. The measured superconductivity parameters, such as Tc, London penetration depth and the Ginzburg-Landau coherence length, are compared with those of the monomer K3C60. and the main factors determining the differences between the two systems are discussed.
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