Superconductivity in the graphite-potassium intercalation compound C8K

Yoji Koike; Sei ichi Tanuma; Hiroyoshi Suematsu; Kohei Higuchi

doi:10.1016/0022-3697(80)90067-0

Superconductivity in the graphite-potassium intercalation compound C₈K

Yoji Koike, Sei ichi Tanuma, Hiroyoshi Suematsu, Kohei Higuchi

ENG - Applied Physics

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

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 T_c 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° ≦ {divides} θ {divides} ≲ 25° and type I superconductivity for 25° ≲ {divides} θ {divides}≦ 90°. The angular dependences of H_c2 and H_c3 were fairly well-explained by the effective mass model.

Original language	English
Pages (from-to)	1111-1118
Number of pages	8
Journal	Journal of Physics and Chemistry of Solids
Volume	41
Issue number	10
DOIs	https://doi.org/10.1016/0022-3697(80)90067-0
Publication status	Published - 1980

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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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° ≦ {divides} θ {divides} ≲ 25° and type I superconductivity for 25° ≲ {divides} θ {divides}≦ 90°. The angular dependences of Hc2 and Hc3 were fairly well-explained by the effective mass model.",

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T1 - Superconductivity in the graphite-potassium intercalation compound C8K

AU - Koike, Yoji

AU - Tanuma, Sei ichi

AU - Suematsu, Hiroyoshi

AU - Higuchi, Kohei

PY - 1980

Y1 - 1980

N2 - 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° ≦ {divides} θ {divides} ≲ 25° and type I superconductivity for 25° ≲ {divides} θ {divides}≦ 90°. The angular dependences of Hc2 and Hc3 were fairly well-explained by the effective mass model.

AB - 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° ≦ {divides} θ {divides} ≲ 25° and type I superconductivity for 25° ≲ {divides} θ {divides}≦ 90°. The angular dependences of Hc2 and Hc3 were fairly well-explained by the effective mass model.

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Superconductivity in the graphite-potassium intercalation compound C₈K

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