Metallic phase in potassium fulleride KxC70: Electrical, magnetic, and structural properties of K4C70

Toshifumi Hara, Mototada Kobayashi, Yuichi Akahama, Haruki Kawamura, Mayumi Kosaka, Katsumi Tanigaki

研究成果: Article査読


The metallic phase in potassium fullerides KxC70 was researched using electrical resistivity measurements in the case of film samples and magnetic susceptibility measurements in the case of powder samples. The K concentration dependence of the electrical resistivity of the K xC70 film at 423 K showed two minima: namely, 1.0×10-1 and 6.1×10-3 Ω cm at x = 1.1 and 4.1, respectively. The temperature dependence of the resistivity of the K4C70 film showed a disordered-metallic behavior. Superconducting quantum interference device (SQUID) measurements for K 4C70 powder revealed a temperature-independent magnetic susceptibility contribution of 3.47×10-4 emu/mol. This contribution was attributed to Pauli paramagnetism, and it was also observed in electron spin resonance (ESR) measurements. Futhermore, ESR spectra for K 4C70 powder showed that the linewidth broadened with increasing temperature. It was clearly established that K4C 70 is a metallic phase in KxC70. The crystal structure of K4C70 was found to be simple tetragonal with a = 1.266 nm and c = 1.098 nm. No superconductivity was observed in K4C70 above 2 K.

ジャーナルPhysical Review B - Condensed Matter and Materials Physics
出版ステータスPublished - 2003 7 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学


「Metallic phase in potassium fulleride K<sub>x</sub>C<sub>70</sub>: Electrical, magnetic, and structural properties of K<sub>4</sub>C<sub>70</sub>」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。