Superconductivity in the graphite-potassium intercalation compound C8K |
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| Authors: | Yoji Koike Sei-ichi Tanuma Hiroyoshi Suematsu Kohei Higuchi |
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| Affiliation: | The Institute for Solid State Physics, the University of Tokyo, Roppongi Minato-ku, Tokyo, 106 Japan;Institute of Materials Science, University of Tsukuba, Sakura-mura, Ibaraki-ken, 300-31 Japan;Nippon Electric Company Ltd., Central Research Laboratory, Miyazaki 4-1-1, Takatsuku, Kawasaki 213 Japan |
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| Abstract: | Superconducting properties of pseudo-single crystals of C8K were investigated by low frequency a.c. magnetic susceptibility and electrical resistivity measurements. The measured values of Tc were between 128 and 198 mK for 13 samples. Measurements of the superconducting transition in a magnetic field revealed a remarkable anisotropy, such that if θ is defined as the angle between the applied magnetic field and the layer plane, type II superconductivity was observed for 0° ≦ ∣ θ ∣ ? 25° and type I superconductivity for 25° ? ∣ θ ∣≦ 90°. The angular dependences of Hc2 and Hc3 were fairly well-explained by the effective mass model. |
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