Superconductivity in graphite-alkali metal intercalation compounds

Yoji Koike, H. Suematsu, K. Higuchi, S. Tanuma

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


Superconducting properties of pseudo-single crystals of C8K were mainly investigated by the low frequency AC magnetic susceptibility and the electrical resistivity. The measured values of Tc dispersed from 128 mK to 198 mK for 13 samples. The measurements of the superconducting transition under magnetic field revealed a remarkable anisotropy due to the field angle θ measured from the layer plane, i.e., a type I superconductivity was observed for 25°{less-than or approximate}|θ|≦ 90dg and a type II for 0°≦|θ|{less-than or approximate}25°. The angular dependences of Hc2 and Hc3 were fairly well explained by the effective mass model. The H c2 versus T curve under magnetic field perpendicular to the c-axis showed a positive curvature in the temperature range near Tc.

Original languageEnglish
Pages (from-to)503-508
Number of pages6
JournalPhysica B+C
Issue number1-4
Publication statusPublished - 1980 Jan 1


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