TY - JOUR
T1 - Superconductivity in graphite-alkali metal intercalation compounds
AU - Koike, Yoji
AU - Suematsu, H.
AU - Higuchi, K.
AU - Tanuma, S.
PY - 1980/1/1
Y1 - 1980/1/1
N2 - 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.
AB - 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.
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U2 - 10.1016/0378-4363(80)90286-7
DO - 10.1016/0378-4363(80)90286-7
M3 - Article
SN - 0378-4363
VL - 99
SP - 503
EP - 508
JO - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics
JF - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics
IS - 1-4
ER -