Superconductivity appearing from C60 doped with rare-earth metals

Misaho Akada, Toshinari Hirai, Junji Takeuchi, Takao Yamamoto, Ryotaro Kumashiro, Katsumi Tanigaki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The superconductivity observed in rare-earth C60 fullerides REx C60 (RE = Yb and Sm) and La - C60 compounds are described. It is shown that RE2.75 C60's do not superconduct and the true superconducting phase in Yb - C60 fulleride resides in the t1 g band. No superconductivity is observed in Sm - C60 fullerides. The phase sequence between Yb - C60 fullerides and Sm - C60 ones as a function of the intercalant concentration is shown to be greatly different, although Yb and Sm are the same family of divalent rare-earth elements. This seems to explain the loss of superconductivity in Smx C60, and suggests that the true superconducting phase is most likely Ybx C60(x > 3) with the primitive cubic lattice. In addition, the superconductivity observed in C60 with La is shown to result from La2 C3 carbides with two transition temperatures.

Original languageEnglish
Pages (from-to)S83-S87
JournalScience and Technology of Advanced Materials
Volume7
Issue numberSUPPL. 1
Publication statusPublished - 2006 Jan 1

Keywords

  • Fullerenes and related materials
  • Superconductivity

ASJC Scopus subject areas

  • Materials Science(all)

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