Superconductivity in the graphite-potassium intercalation compound C8K

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

Research output: Contribution to journalArticlepeer-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 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.

Original languageEnglish
Pages (from-to)1111-1118
Number of pages8
JournalJournal of Physics and Chemistry of Solids
Volume41
Issue number10
DOIs
Publication statusPublished - 1980

ASJC Scopus subject areas

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

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