Potassium Concentration Dependence of the Superconductivity in the Potassium Graphite Intercalation Compounds

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概要

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• Magnetic susceptibilities have bcen measured at temperatures down to 60 mK by AC Hartshorn bridge method for the potassium graphite intercalation com-pounds with several compositions(C8.0K-C21.6K) prepared by the use of HOPG. T. is nearly constant to be -150 mK for C8.0K C14.7K, while no transition is found down to 00 mK for C16.7K and C21.6K. As the K concen tration is decreased, the superconducting characteristic changes from type 11 to type I for the magnetic field H paranel to the layers, while it maintains type I for H perpendicular to the layers. The superconducting fiuctuation above T., the effeetive mass ratio and the curvature of H.2 Versus T curve are investigated ; all of them lead to the result that 3D character increases with the decrease of the K concentration. The constancy of T. above the critical K concentration is also discussed .

• 社団法人日本物理学会の論文
• 1981-10-15

著者

• Tsujikawa Ikuji

  Department Of Chemisity Faculty Of Science Kyoto University

• Kobayashi Mototada

  Department Of Chemistry Faculty Of Science Kyoto University

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